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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman"><strong>UNITED
      STATES</strong></font></div>
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      AND EXCHANGE COMMISSION</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Washington,
      D.C. 20549</strong></font></div>
    <div>&#160;

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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 16pt; FONT-FAMILY: Times New Roman"><strong>FORM
      8-K</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>CURRENT
      REPORT PURSUANT TO SECTION 13 OR 15(d)</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>OF
      THE SECURITIES EXCHANGE ACT OF 1934</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>June
      6, 2006</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date
      of
      Report (Date of earliest event reported)</font></div>
    <div>&#160;</div>
    <div>
      <hr style="COLOR: black" align="center" noshade size="1" width="25%">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 20pt; FONT-FAMILY: Times New Roman"><strong>NORTH
      AMERICAN SCIENTIFIC, INC.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(Exact
      name of registrant as specified in its charter)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><strong>Delaware</strong></font></div>
            </td>
            <td align="justify" valign="top" width="34%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><strong>0-26670</strong></font></div>
            </td>
            <td align="justify" valign="top" width="33%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><strong>51-0366422</strong></font></div>
            </td>
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          <tr>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(State
                or other jurisdiction of</font></div>
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            <td align="justify" valign="top" width="34%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(Commission</font></div>
            </td>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(I.R.S.
                Employer</font></div>
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              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">incorporation)</font></div>
            </td>
            <td align="justify" valign="top" width="34%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">File
                Number )</font></div>
            </td>
            <td align="justify" valign="top" width="33%">
              <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">Identification
                No.)</font></div>
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    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><strong>20200
      Sunburst Street, Chatsworth, California 91311</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(Address
      of principal executive
      offices)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;
&#160;(Zip Code)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><strong>(818)
      734-8600</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(Registrant&#8217;s
      telephone number, including area code)</font></div>
    <div>&#160;</div>
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      <hr style="COLOR: black" align="center" noshade size="1" width="25%">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman"><strong>Not
      Applicable</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(Former
      Name or Former Address, if Changed Since Last Report)</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Check
      the
      appropriate box below if the Form 8-K filing is intended to simultaneously
      satisfy the filing obligation of the registrant under any of the following
      provisions:</font></div>
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            <td align="left" style="width: 18pt;"><font style="FONT-FAMILY: Wingdings" size="2">o</font></td>
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              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Written
                communications pursuant to Rule 425 under the Securities Act (17
                CFR
                230.425)</font></div>
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              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Soliciting
                material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
                240.14a-12)</font></div>
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            <td align="left" style="width: 18pt;"><font style="FONT-FAMILY: Wingdings" size="2">o</font></td>
            <td align="left">
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
                communications pursuant to Rule 14d-2(b) under the Exchange Act (17
                CFR
                240.14d-2(b))</font></div>
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      </table>
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          <tr valign="top" style="line-height: 1.25;">
            <td align="left" style="width: 18pt;"><font style="FONT-FAMILY: Wingdings" size="2">o</font></td>
            <td align="left">
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
                communications pursuant to Rule 13e-4(c) under the Exchange Act (17
                CFR
                240.13e-4(c))</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div>&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">
      <hr style="COLOR: black" align="left" noshade size="5" width="100%">&#160;<br></div>
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        </div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
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        </div>
      </div>
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    </div><br>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      1.01 Entry into a Material Definitive Agreement.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      June
      6, 2006, North American Scientific, Inc. (the &#8220;Company&#8221;) entered into Securities
      Purchase Agreements with certain private equity investors (the &#8220;Investors&#8221;)
      providing for the private placement of 12,291,934 shares of common stock of
      the
      Company at a purchase price of $1.9525 per share, of which $0.0625 is allocated
      as consideration for the warrants. In addition, the Company will issue warrants
      (the &#8220;Warrants&#8221;) to the Investors to purchase up to 6,145,967 shares of the
      Company&#8217;s common stock at an exercise price of $2.08 per share, subject to
      certain adjustments. The Company expects to close the private placement on
      or
      about June 7, 2006. The warrants may be exercised no earlier than 180 days
      from
      the closing date and will expire seven years from the date of issuance. The
      aggregate offering price of the private placement is approximately $24 million.
      Of this amount, Three Arch Partners purchased approximately 5,121,638 shares
      plus warrants to purchase up to 2,560,819 shares of the Company&#8217;s common stock.
      The net proceeds to the Company after payment of fees and expenses is expected
      to be approximately $22 million.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CIBC
      World Markets Corp. acted as sole placement agent in connection with the private
      placement. The placement agent will receive an aggregate of approximately $1.7
      million in cash in connection with the private placement plus reimbursement
      for
      reasonable out-of-pocket fees and expenses.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      shares of common stock being sold to the Investors and the shares of common
      stock issuable upon the exercise of the Warrants (collectively, the &#8220;Registrable
      Securities&#8221;) are subject to certain registration rights as set forth in the
      Securities Purchase Agreements. Under the Securities Purchase Agreements, the
      Company agreed to file a registration statement with the Securities and Exchange
      Commission within 45 days after the closing of the transaction to register
      the
      resale of the Registrable Securities. If the Company fails to file a
      registration statement within such time period or such registration statement
      is
      not declared effective within 90 days after the closing of the transaction,
      the
      Company will be liable for certain specified liquidated damages as set forth
      in
      the Securities Purchase Agreements. The Company has agreed to maintain the
      effectiveness of the registration statement until&#160;the earlier of such time
      as the passage of two years from the closing date or&#160;all of the Registrable
      Securities may be sold under Rule 144(k) of the Securities Act or all of the
      Registrable Securities have been sold. The Company will pay all expenses
      incurred in connection with the registration, except for underwriting discounts
      and commissions.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Securities Purchase Agreements contain certain customary closing conditions,
      as
      well as the requirement that the Company increase the number of members of
      the
      Board of Directors of the Company (the &#8220;Board&#8221;) from seven members to nine
      members. Under the Securities Purchase Agreements, Three Arch Partners has
      the
      right to designate two members to the Board so long as Three Arch Partners
      beneficially owns greater than 3,500,000 shares of common stock (including
      shares of common stock issuable upon exercise of the Warrants, and as
      appropriately adjusted for stock splits, stock dividends and recapitalizations)
      and the right to designate one member to the Board so long as Three Arch
      Partners beneficially owns greater than 2,000,000 shares of common stock
      (including shares of common stock issuable upon exercise of the Warrants, and
      as
      appropriately adjusted for stock splits, stock dividends and
      recapitalizations).</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
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        </div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
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        </div>
      </div>
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    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">In
      connection with the issuance of the Warrants and upon closing of the
      transaction, the Company will enter into a Warrant Agreement with its transfer
      agent relating to the Warrant of Three Arch Partners and a different Warrant
      Agreement with its transfer agent relating to the Warrants of the Investors
      other than Three Arch Partners. The material differences between the two Warrant
      Agreements are described below.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Three
      Arch Partners Warrant Agreement includes a non-waivable provision that provides
      that the number of shares issuable upon exercise of the Warrants that may be
      acquired by Three Arch Partners will be limited to the extent necessary to
      assure that, following such exercise, the total number of shares of common
      stock
      then beneficially owned by Three Arch Partners and its affiliates does not
      exceed 19.9% of the total number of issued and outstanding shares of common
      stock as of the date of such exercise (including for such purpose the shares
      of
      common stock issuable upon such exercise of Warrants), unless approved by the
      stockholders of the Company prior to such exercise. The Warrant Agreement
      relating to the Warrants of the other investors does not include such a
      provision.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Warrant Agreement relating to the Investors other than Three Arch Partners
      includes a waivable provision that provides that the number of shares issuable
      upon exercise of the Warrants that may be acquired by a registered holder of
      Warrants upon an exercise of Warrants will be limited to the extent necessary
      to
      assure that, following such exercise, the total number of shares of common
      stock
      then beneficially owned by its holder and its affiliates does not exceed 4.99%
      of the total number of issued and outstanding shares of common stock (including
      for such purpose the shares of common stock issuable upon such exercise of
      Warrants). This provision may be waived by a registered holder of Warrants
      upon,
      at the election of such holder, upon not less than 61 days prior notice to
      the
      Company. This Warrant Agreement also contains a non-waivable provision that
      provides that the number of shares issuable upon exercise of the Warrants that
      may be acquired by a registered holder of Warrants upon an exercise of Warrants
      will be limited to the extent necessary to assure that, following such exercise,
      the total number of shares of common stock then beneficially owned by such
      holder and its affiliates does not exceed 9.99% of the total number of issued
      and outstanding shares of common stock (including for such purpose the shares
      of
      common stock issuable upon such exercise of Warrants). The Warrant Agreement
      relating to the Warrants of Three Arch Partners does not include such
      provisions.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      sale
      of the shares of common stock, the Warrants and the shares of common stock
      issuable upon exercise of the Warrants have not been registered under the
      Securities Act of 1933, as amended (the &#8220;Securities Act&#8221;), or any state
      securities laws. The Company is relying upon the exemptions from registration
      provided by Section 4(2) of the Securities Act and Regulation D promulgated
      under that section. Each Investor has represented that it was an accredited
      investor, as such term is defined in Regulation D under the Securities Act,
      and
      that it was acquiring the common stock and Warrants for its own account and
      not
      with a view to or for sale in connection with any distribution thereof, and
      appropriate legends will be affixed to the common stock and
      Warrants.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      June
      5, 2006, prior to the execution of the Securities Purchase Agreements, the
      Company also entered into a Second Amendment dated as of June 5, 2006 to the
      Rights Agreement, dated as of October 14, 1998, by and between the Company
      and
      U.S. Stock Transfer Corporation, which provides that the private placement
      and
      the transactions contemplated thereby will be exempt from the Rights Agreement
      and the private placement and the transactions contemplated thereby will not
      be
      deemed a Triggering Event (as defined in the Rights Agreement), nor any Investor
      be deemed an Acquiring Person (as defined in the Rights Agreement) by reason
      of
      the private placement or any of the transactions contemplated thereby. The
      Second Amendment to Rights Agreement is attached hereto as Exhibit 10.4 and
      is
      incorporated herein by reference.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
        </div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      foregoing is a summary of the terms of the private placement and is qualified
      in
      its entirety by reference to the Securities Purchase Agreement and the Warrant
      Agreements attached hereto. The Securities Purchase Agreement has been included
      to provide information regarding its terms. It is not intended to provide any
      other factual information about the Company. The Securities Purchase Agreement
      contains representations and warranties that the parties to the Securities
      Purchase Agreement made to and solely for the benefit of each other. The
      assertions embodied in such representations and warranties are qualified by
      information contained in confidential disclosure schedules delivered by the
      Company to the Investors in connection with the execution of the Securities
      Purchase Agreement. No reliance should be placed on such representations and
      warranties as characterizations of the actual state of facts or circumstances
      since they were made only as of the date of the Securities Purchase Agreement
      and are modified in important part by the disclosure schedules. Information
      concerning the subject matter of such representations and warranties may change
      after the date of the Securities Purchase Agreement, which subsequent
      information may or may not be fully reflected in the Company&#8217;s public
      disclosures. The Securities Purchase Agreement and the Warrant Agreements are
      attached hereto as Exhibits 10.1, 10.2 and 10.3, respectively. A press release
      announcing the private placement is attached hereto as Exhibit 99.1 and is
      incorporated herein by reference.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      3.02 Unregistered Sale of Equity Securities.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      information set forth in Item 1.01 above is incorporated by reference
      herein.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      3.03 Material Modification to Rights of Security Holders.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      information set forth in Item 1.01 above is incorporated by reference
      herein.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -72pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -72pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Item
      9.01 Financial Statements and Exhibits.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -72pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">
            </td>
            <td align="left" style="width: 36pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>(c)</strong></font></td>
            <td align="left">
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Exhibits</strong></font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">
            </td>
            <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>ExhibitNo.</u></strong></font></td>
            <td align="left">
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Description</u></strong></font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -72pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">
            </td>
            <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.1</font></td>
            <td align="left">
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Securities
                Purchase Agreement dated June 6, 2006 between the </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Company
                and the Investors.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">
            </td>
            <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.2</font></td>
            <td align="left">
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Form
                of Warrant Agreement between the Company and Three </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Arch
                Partners.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">
            </td>
            <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.3</font></td>
            <td align="left">
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Form
                of Warrant Agreement between the Company and certain </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">other
                investors.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
        </div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">
            </td>
            <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.4</font></td>
            <td align="left">
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Second
                Amendment to Rights Agreement, dated June 5, 2006 by </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">and
                between the Company and U.S. Stock Transfer
                Corporation.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div>
      <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

          <tr valign="top" style="line-height: 1.25;">
            <td style="width: 36pt;">
            </td>
            <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.1</font></td>
            <td align="left">
              <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Press
                release of the Company dated June 6,
                2006.</font></div>
            </td>
          </tr>

      </table>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
        </div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div><br>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>SIGNATURES</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
      to the requirements of the Securities Exchange Act of 1934, the Registrant
      has
      duly caused this report to be signed on its behalf by the undersigned hereunto
      duly authorized.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">
      <table align="center" bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" width="100%">

          <tr valign="top" bgcolor="#ffffff">
            <td width="50%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td width="1%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td width="49%"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td colspan="2"><strong><font size="2">NORTH AMERICAN SCIENTIFIC,
              INC.</font></strong></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;<br>&#160;</font></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Date:
              <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">June
              7, 2006</font></font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">By:&#160;&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">/s/L.Michael
              Cutrer</font></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td colspan="2"><font style="FONT-FAMILY: " size="1">&#160;</font></td>
            <td align="left">
              <hr style="COLOR: black" align="left" noshade size="2" width="80%"><font size="2">Name:
</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">L.
              Michael Cutrer</font></td>
          </tr>
          <tr valign="top" bgcolor="#ffffff">
            <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">&#160;</font></td>
            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Title:
              <font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">President
              and Chief Executive
              Officer</font></font></td>
          </tr>

      </table><br><br></div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div id="GLFTR" style="WIDTH: 100%" align="left">
        </div>
      </div>
      <div id="PN" style="PAGE-BREAK-AFTER: always">
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
        </div>
        <div style="WIDTH: 100%; TEXT-ALIGN: center">
          <hr style="COLOR: black" noshade size="2">
        </div>
      </div>
      <div id="HDR">
        <div id="GLHDR" style="WIDTH: 100%" align="right">
        </div>
      </div>
    </div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>EXHIBIT
      INDEX</u></strong></font></div>
    <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
      <div id="FTR">
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

              <tr valign="top" style="line-height: 1.25;">
                <td style="width: 36pt;">
                </td>
                <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>ExhibitNo.</u></strong></font></td>
                <td align="left">
                  <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Description</u></strong></font></div>
                </td>
              </tr>

          </table>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -72pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

              <tr valign="top" style="line-height: 1.25;">
                <td style="width: 36pt;">
                </td>
                <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.1</font></td>
                <td align="left">
                  <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Securities
                    Purchase Agreement dated June 6, 2006 between the </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Company
                    and the Investors.</font></div>
                </td>
              </tr>

          </table>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

              <tr valign="top" style="line-height: 1.25;">
                <td style="width: 36pt;">
                </td>
                <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.2</font></td>
                <td align="left">
                  <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Form
                    of Warrant Agreement between the Company and Three </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Arch
                    Partners.</font></div>
                </td>
              </tr>

          </table>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

              <tr valign="top" style="line-height: 1.25;">
                <td style="width: 36pt;">
                </td>
                <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.3</font></td>
                <td align="left">
                  <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Form
                    of Warrant Agreement between the Company and certain </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">other
                    investors.</font></div>
                </td>
              </tr>

          </table>
        </div>
      </div>
      <div>&#160;</div>
      <div>
        <div>
          <table align="center" border="0" cellpadding="0" cellspacing="0" id="hangingindent" width="100%" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">

              <tr valign="top" style="line-height: 1.25;">
                <td style="width: 36pt;">
                </td>
                <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">10.4</font></td>
                <td align="left">
                  <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Second
                    Amendment to Rights Agreement, dated June 5, 2006 by </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">and
                    between the Company and U.S. Stock Transfer
                    Corporation.</font></div>
                </td>
              </tr>

          </table>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
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                <td align="left" style="width: 72pt;"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.1</font></td>
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                  <div align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Press
                    release of the Company dated June 6,
                    2006.</font></div>
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{"company-data": {"conformed-name": "NORTH AMERICAN SCIENTIFIC INC", "cik": "0000949876", "assigned-sic": "3845", "irs-number": "510366422", "fiscal-year-end": "1031"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-26670", "film-number": "06891761"}, "business-address": {"street1": "20200 SUNBURST ST", "city": "CHATSWORTH", "state": "CA", "zip": "91311", "phone": "8187348600"}, "mail-address": {"street1": "20200 SUNBURST ST", "city": "CHATSWORTH", "state": "CA", "zip": "91311"}}
UNITED
      STATES
SECURITIES
      AND EXCHANGE COMMISSION
Washington,
      D.C. 20549
FORM
      8-K
CURRENT
      REPORT PURSUANT TO SECTION 13 OR 15(d)
OF
      THE SECURITIES EXCHANGE ACT OF 1934
June
      6, 2006
Date
      of
      Report (Date of earliest event reported)
NORTH
      AMERICAN SCIENTIFIC, INC.
(Exact
      name of registrant as specified in its charter)
Delaware
0-26670
51-0366422
(State
                or other jurisdiction of
(Commission
(I.R.S.
                Employer
incorporation)
File
                Number )
Identification
                No.)
20200
      Sunburst Street, Chatsworth, California 91311
(Address
      of principal executive
      offices)                                    
 (Zip Code)
(818)
      734-8600
(Registrant's
      telephone number, including area code)
Not
      Applicable
(Former
      Name or Former Address, if Changed Since Last Report)
Check
      the
      appropriate box below if the Form 8-K filing is intended to simultaneously
      satisfy the filing obligation of the registrant under any of the following
      provisions:
o
Written
                communications pursuant to Rule 425 under the Securities Act (17
                CFR
                230.425)
o
Soliciting
                material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
                240.14a-12)
o
Pre-commencement
                communications pursuant to Rule 14d-2(b) under the Exchange Act (17
                CFR
                240.14d-2(b))
o
Pre-commencement
                communications pursuant to Rule 13e-4(c) under the Exchange Act (17
                CFR
                240.13e-4(c))
Item
      1.01 Entry into a Material Definitive Agreement.
On
      June
      6, 2006, North American Scientific, Inc. (the "Company") entered into Securities
      Purchase Agreements with certain private equity investors (the "Investors")
      providing for the private placement of 12,291,934 shares of common stock of
      the
      Company at a purchase price of $1.9525 per share, of which $0.0625 is allocated
      as consideration for the warrants. In addition, the Company will issue warrants
      (the "Warrants") to the Investors to purchase up to 6,145,967 shares of the
      Company's common stock at an exercise price of $2.08 per share, subject to
      certain adjustments. The Company expects to close the private placement on
      or
      about June 7, 2006. The warrants may be exercised no earlier than 180 days
      from
      the closing date and will expire seven years from the date of issuance. The
      aggregate offering price of the private placement is approximately $24 million.
      Of this amount, Three Arch Partners purchased approximately 5,121,638 shares
      plus warrants to purchase up to 2,560,819 shares of the Company's common stock.
      The net proceeds to the Company after payment of fees and expenses is expected
      to be approximately $22 million.
CIBC
      World Markets Corp. acted as sole placement agent in connection with the private
      placement. The placement agent will receive an aggregate of approximately $1.7
      million in cash in connection with the private placement plus reimbursement
      for
      reasonable out-of-pocket fees and expenses.
The
      shares of common stock being sold to the Investors and the shares of common
      stock issuable upon the exercise of the Warrants (collectively, the "Registrable
      Securities") are subject to certain registration rights as set forth in the
      Securities Purchase Agreements. Under the Securities Purchase Agreements, the
      Company agreed to file a registration statement with the Securities and Exchange
      Commission within 45 days after the closing of the transaction to register
      the
      resale of the Registrable Securities. If the Company fails to file a
      registration statement within such time period or such registration statement
      is
      not declared effective within 90 days after the closing of the transaction,
      the
      Company will be liable for certain specified liquidated damages as set forth
      in
      the Securities Purchase Agreements. The Company has agreed to maintain the
      effectiveness of the registration statement until the earlier of such time
      as the passage of two years from the closing date or all of the Registrable
      Securities may be sold under Rule 144(k) of the Securities Act or all of the
      Registrable Securities have been sold. The Company will pay all expenses
      incurred in connection with the registration, except for underwriting discounts
      and commissions.
The
      Securities Purchase Agreements contain certain customary closing conditions,
      as
      well as the requirement that the Company increase the number of members of
      the
      Board of Directors of the Company (the "Board") from seven members to nine
      members. Under the Securities Purchase Agreements, Three Arch Partners has
      the
      right to designate two members to the Board so long as Three Arch Partners
      beneficially owns greater than 3,500,000 shares of common stock (including
      shares of common stock issuable upon exercise of the Warrants, and as
      appropriately adjusted for stock splits, stock dividends and recapitalizations)
      and the right to designate one member to the Board so long as Three Arch
      Partners beneficially owns greater than 2,000,000 shares of common stock
      (including shares of common stock issuable upon exercise of the Warrants, and
      as
      appropriately adjusted for stock splits, stock dividends and
      recapitalizations).
In
      connection with the issuance of the Warrants and upon closing of the
      transaction, the Company will enter into a Warrant Agreement with its transfer
      agent relating to the Warrant of Three Arch Partners and a different Warrant
      Agreement with its transfer agent relating to the Warrants of the Investors
      other than Three Arch Partners. The material differences between the two Warrant
      Agreements are described below.
The
      Three
      Arch Partners Warrant Agreement includes a non-waivable provision that provides
      that the number of shares issuable upon exercise of the Warrants that may be
      acquired by Three Arch Partners will be limited to the extent necessary to
      assure that, following such exercise, the total number of shares of common
      stock
      then beneficially owned by Three Arch Partners and its affiliates does not
      exceed 19.9% of the total number of issued and outstanding shares of common
      stock as of the date of such exercise (including for such purpose the shares
      of
      common stock issuable upon such exercise of Warrants), unless approved by the
      stockholders of the Company prior to such exercise. The Warrant Agreement
      relating to the Warrants of the other investors does not include such a
      provision.
The
      Warrant Agreement relating to the Investors other than Three Arch Partners
      includes a waivable provision that provides that the number of shares issuable
      upon exercise of the Warrants that may be acquired by a registered holder of
      Warrants upon an exercise of Warrants will be limited to the extent necessary
      to
      assure that, following such exercise, the total number of shares of common
      stock
      then beneficially owned by its holder and its affiliates does not exceed 4.99%
      of the total number of issued and outstanding shares of common stock (including
      for such purpose the shares of common stock issuable upon such exercise of
      Warrants). This provision may be waived by a registered holder of Warrants
      upon,
      at the election of such holder, upon not less than 61 days prior notice to
      the
      Company. This Warrant Agreement also contains a non-waivable provision that
      provides that the number of shares issuable upon exercise of the Warrants that
      may be acquired by a registered holder of Warrants upon an exercise of Warrants
      will be limited to the extent necessary to assure that, following such exercise,
      the total number of shares of common stock then beneficially owned by such
      holder and its affiliates does not exceed 9.99% of the total number of issued
      and outstanding shares of common stock (including for such purpose the shares
      of
      common stock issuable upon such exercise of Warrants). The Warrant Agreement
      relating to the Warrants of Three Arch Partners does not include such
      provisions.
The
      sale
      of the shares of common stock, the Warrants and the shares of common stock
      issuable upon exercise of the Warrants have not been registered under the
      Securities Act of 1933, as amended (the "Securities Act"), or any state
      securities laws. The Company is relying upon the exemptions from registration
      provided by Section 4(2) of the Securities Act and Regulation D promulgated
      under that section. Each Investor has represented that it was an accredited
      investor, as such term is defined in Regulation D under the Securities Act,
      and
      that it was acquiring the common stock and Warrants for its own account and
      not
      with a view to or for sale in connection with any distribution thereof, and
      appropriate legends will be affixed to the common stock and
      Warrants.
On
      June
      5, 2006, prior to the execution of the Securities Purchase Agreements, the
      Company also entered into a Second Amendment dated as of June 5, 2006 to the
      Rights Agreement, dated as of October 14, 1998, by and between the Company
      and
      U.S. Stock Transfer Corporation, which provides that the private placement
      and
      the transactions contemplated thereby will be exempt from the Rights Agreement
      and the private placement and the transactions contemplated thereby will not
      be
      deemed a Triggering Event (as defined in the Rights Agreement), nor any Investor
      be deemed an Acquiring Person (as defined in the Rights Agreement) by reason
      of
      the private placement or any of the transactions contemplated thereby. The
      Second Amendment to Rights Agreement is attached hereto as Exhibit 10.4 and
      is
      incorporated herein by reference.
The
      foregoing is a summary of the terms of the private placement and is qualified
      in
      its entirety by reference to the Securities Purchase Agreement and the Warrant
      Agreements attached hereto. The Securities Purchase Agreement has been included
      to provide information regarding its terms. It is not intended to provide any
      other factual information about the Company. The Securities Purchase Agreement
      contains representations and warranties that the parties to the Securities
      Purchase Agreement made to and solely for the benefit of each other. The
      assertions embodied in such representations and warranties are qualified by
      information contained in confidential disclosure schedules delivered by the
      Company to the Investors in connection with the execution of the Securities
      Purchase Agreement. No reliance should be placed on such representations and
      warranties as characterizations of the actual state of facts or circumstances
      since they were made only as of the date of the Securities Purchase Agreement
      and are modified in important part by the disclosure schedules. Information
      concerning the subject matter of such representations and warranties may change
      after the date of the Securities Purchase Agreement, which subsequent
      information may or may not be fully reflected in the Company's public
      disclosures. The Securities Purchase Agreement and the Warrant Agreements are
      attached hereto as Exhibits 10.1, 10.2 and 10.3, respectively. A press release
      announcing the private placement is attached hereto as Exhibit 99.1 and is
      incorporated herein by reference.
Item
      3.02 Unregistered Sale of Equity Securities.
The
      information set forth in Item 1.01 above is incorporated by reference
      herein.
Item
      3.03 Material Modification to Rights of Security Holders.
The
      information set forth in Item 1.01 above is incorporated by reference
      herein.
Item
      9.01 Financial Statements and Exhibits.
(c)
Exhibits
ExhibitNo.
Description
10.1
Securities
                Purchase Agreement dated June 6, 2006 between the
Company
                and the Investors.
10.2
Form
                of Warrant Agreement between the Company and Three
Arch
                Partners.
10.3
Form
                of Warrant Agreement between the Company and certain
other
                investors.
10.4
Second
                Amendment to Rights Agreement, dated June 5, 2006 by
and
                between the Company and U.S. Stock Transfer
                Corporation.
99.1
Press
                release of the Company dated June 6,
                2006.
SIGNATURES
Pursuant
      to the requirements of the Securities Exchange Act of 1934, the Registrant
      has
      duly caused this report to be signed on its behalf by the undersigned hereunto
      duly authorized.
NORTH AMERICAN SCIENTIFIC,
              INC.
Date:
June
              7, 2006
By:
/s/L.Michael
              Cutrer
Name:
L.
              Michael Cutrer
Title:
President
              and Chief Executive
              Officer
EXHIBIT
      INDEX
ExhibitNo.
Description
10.1
Securities
                    Purchase Agreement dated June 6, 2006 between the
Company
                    and the Investors.
10.2
Form
                    of Warrant Agreement between the Company and Three
Arch
                    Partners.
10.3
Form
                    of Warrant Agreement between the Company and certain
other
                    investors.
10.4
Second
                    Amendment to Rights Agreement, dated June 5, 2006 by
and
                    between the Company and U.S. Stock Transfer
                    Corporation.
99.1
Press
                    release of the Company dated June 6,
                    2006.