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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>
    <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>SECURITIES
      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 style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</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: 14pt; 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>April
      28, 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 style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#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: 14pt; 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>
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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: 10pt; FONT-FAMILY: Times New Roman"><strong>Delaware</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;</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="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; 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="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>51-0366422</strong></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="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(State
                or other jurisdiction of</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="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(Commission</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="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">(I.R.S.
                Employer</font></div>
            </td>
          </tr>
          <tr>
            <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="center"><font style="DISPLAY: inline; FONT-SIZE: 8pt; FONT-FAMILY: Times New Roman">incorporation)</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="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="center"><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: 10pt; 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) (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: 10pt; 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 style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div>&#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>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="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>
    <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">&#9633;
      </font><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>
    <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">&#9633;
      </font><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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      </font><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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      </font><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>
    <div>&#160;</div><br>
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    <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
      3.01 Notice of Delisting or Failure to Satisfy a Continued Listing Rule or
      Standard;&#160;</strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Transfer
      of Listing.</strong></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 id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
      April
      28, 2006, North American Scientific, Inc. (the "Company") received a notice
      from
      the The Nasdaq Stock Market ("Nasdaq") stating that the Company&#8217;s securities
      will be delisted from The Nasdaq National Market at the opening of business
      on
      May 9, 2006, unless the Company requests a hearing in accordance with the
      Marketplace Rule 4800 Series. As previously reported on Form 8-K filed with
      the
      Securities and Exchange Commission on March 17, 2006, Nasdaq has determined
      that
      the Company is not in compliance with the minimum $10 million stockholders&#8217;
equity requirement for continued listing on the Nasdaq National Market set
      forth
      in Marketplace Rule 4450(a)(3).</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
      Company plans to request a hearing before the Nasdaq Listing Qualifications
      Panel to review the Staff determination to delist the Company&#8217;s common stock and
      to seek continued listing of its common stock on The Nasdaq National Market.
      The
      request for a hearing will stay the Staff determination to delist the Company&#8217;s
      common stock until the Listing Qualifications Panel renders a determination
      after the hearing. The Company issued a press release today disclosing its
      receipt of this notice from Nasdaq. A copy of the Company&#8217;s press release is
      attached as Exhibit 99.1 and incorporated herein by reference.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</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
      8.01.</strong></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Other
      Events.</strong></font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">We
      have
      become aware that on April 20, 2006, a lawsuit captioned </font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><em><u>J.P.
      Morgan Trust Company, N.A. v. John Alan Friede, et al.</u></em></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
      was
      filed in the U.S. District Court for the Southern District of New York against
      John A. Friede, a current director and stockholder of North American Scientific,
      Inc. (&#8220;NASI&#8221;), Mr. Friede&#8217;s wife, and NOMOS Corporation, a subsidiary of NASI.
      The plaintiff, J.P. Morgan Trust Company, filed the lawsuit in its capacity
      as
      personal representative of the Estate of Evelyn A.J. Hall, Mr. Friede&#8217;s deceased
      mother. The complaint asserts claims for reimbursement and contribution,
      constructive fraud, breach of contract and other related claims arising out
      of
      loans made by Mrs. Hall to, or for the benefit of, Mr. and Mrs. Friede and/or
      NOMOS, or acting as an accommodation party in additional loans made to Mr.
      and
      Mrs. Friede by financial institutions that were not subsequently repaid. During
      the time periods alleged in the complaint, Mr. Friede was the Chairman, Chief
      Executive Officer and the largest stockholder of NOMOS. With respect to NOMOS,
      the complaint seeks approximately $5,250,000 principal amount of loans allegedly
      made to and still outstanding and owed by NOMOS, and other related equitable
      remedies plus interest, costs and expenses.</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><br></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">To
      date,
      NOMOS has not been served with the complaint. On the basis of copies of
      documents that have been made available to us, we believe that the claims made
      against NOMOS in the lawsuit appear to be without merit and we intend to
      vigorously defend against them. However, in accordance with the indemnification
      provisions of the merger agreement under which we acquired NOMOS on May 4,
      2004,
      and the related indemnity escrow agreement, we intend to make a claim for
      indemnification against the escrow to preserve our right of indemnity. Under
      these provisions, an indemnifying party will not have any indemnification
      obligations until such time as the aggregate indemnified losses for which we
      are
      entitled to indemnification equals or exceeds $400,000, at which point, the
      indemnifying party will be liable for the full amount of all such indemnified
      losses without regard to the $400,000 basket. As of the date hereof, the
      indemnity escrow account holds approximately $1,225,000 of cash and 526,810
      shares of our common stock. We also intend to review various other legal
      remedies that may be available to us.</font></div>
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    <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>
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    <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Exhibit
      No.</u></strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>&#160;</strong></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong><u>Description</u></strong></font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font></div>
    <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -72pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
    <div style="DISPLAY: block; MARGIN-LEFT: 72pt; TEXT-INDENT: -36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Exhibit
      99.1</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Press
      release dated May 1, 2006.</font></div>
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      has
      duly caused this report to be signed on its behalf by the undersigned hereunto
      duly authorized.</font></div>
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            <td colspan="2"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: "><strong>NORTH
              AMERICAN SCIENTIFIC, INC.</strong></font></td>
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            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Date:&#160;May
              1,
              2006</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/&#160;L.
              Michael Cutrer</font></td>
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              <hr style="COLOR: black" align="left" noshade size="2" width="80%"><font size="2">Name:</font><font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt">&#160;</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">L.
              Michael Cutrer</font></td>
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            <td><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: ">Title&#160;President
              and Chief Executive Officer</font></td>
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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
April
      28, 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:
□
Written
      communications pursuant to Rule 425 under the Securities Act (17 CFR
      230.425)
□
Soliciting
      material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)
□
Pre-commencement
      communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
      240.14d-2(b))
□
Pre-commencement
      communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
      240.13e-4(c))
Item
      3.01 Notice of Delisting or Failure to Satisfy a Continued Listing Rule or
      Standard;
Transfer
      of Listing.
On
      April
      28, 2006, North American Scientific, Inc. (the "Company") received a notice
      from
      the The Nasdaq Stock Market ("Nasdaq") stating that the Company's securities
      will be delisted from The Nasdaq National Market at the opening of business
      on
      May 9, 2006, unless the Company requests a hearing in accordance with the
      Marketplace Rule 4800 Series. As previously reported on Form 8-K filed with
      the
      Securities and Exchange Commission on March 17, 2006, Nasdaq has determined
      that
      the Company is not in compliance with the minimum $10 million stockholders'
equity requirement for continued listing on the Nasdaq National Market set
      forth
      in Marketplace Rule 4450(a)(3).
The
      Company plans to request a hearing before the Nasdaq Listing Qualifications
      Panel to review the Staff determination to delist the Company's common stock and
      to seek continued listing of its common stock on The Nasdaq National Market.
      The
      request for a hearing will stay the Staff determination to delist the Company's
      common stock until the Listing Qualifications Panel renders a determination
      after the hearing. The Company issued a press release today disclosing its
      receipt of this notice from Nasdaq. A copy of the Company's press release is
      attached as Exhibit 99.1 and incorporated herein by reference.
Item
      8.01.
Other
      Events.
We
      have
      become aware that on April 20, 2006, a lawsuit captioned
J.P.
      Morgan Trust Company, N.A. v. John Alan Friede, et al.
was
      filed in the U.S. District Court for the Southern District of New York against
      John A. Friede, a current director and stockholder of North American Scientific,
      Inc. ("NASI"), Mr. Friede's wife, and NOMOS Corporation, a subsidiary of NASI.
      The plaintiff, J.P. Morgan Trust Company, filed the lawsuit in its capacity
      as
      personal representative of the Estate of Evelyn A.J. Hall, Mr. Friede's deceased
      mother. The complaint asserts claims for reimbursement and contribution,
      constructive fraud, breach of contract and other related claims arising out
      of
      loans made by Mrs. Hall to, or for the benefit of, Mr. and Mrs. Friede and/or
      NOMOS, or acting as an accommodation party in additional loans made to Mr.
      and
      Mrs. Friede by financial institutions that were not subsequently repaid. During
      the time periods alleged in the complaint, Mr. Friede was the Chairman, Chief
      Executive Officer and the largest stockholder of NOMOS. With respect to NOMOS,
      the complaint seeks approximately $5,250,000 principal amount of loans allegedly
      made to and still outstanding and owed by NOMOS, and other related equitable
      remedies plus interest, costs and expenses.
To
      date,
      NOMOS has not been served with the complaint. On the basis of copies of
      documents that have been made available to us, we believe that the claims made
      against NOMOS in the lawsuit appear to be without merit and we intend to
      vigorously defend against them. However, in accordance with the indemnification
      provisions of the merger agreement under which we acquired NOMOS on May 4,
      2004,
      and the related indemnity escrow agreement, we intend to make a claim for
      indemnification against the escrow to preserve our right of indemnity. Under
      these provisions, an indemnifying party will not have any indemnification
      obligations until such time as the aggregate indemnified losses for which we
      are
      entitled to indemnification equals or exceeds $400,000, at which point, the
      indemnifying party will be liable for the full amount of all such indemnified
      losses without regard to the $400,000 basket. As of the date hereof, the
      indemnity escrow account holds approximately $1,225,000 of cash and 526,810
      shares of our common stock. We also intend to review various other legal
      remedies that may be available to us.
Item
      9.01 Financial Statements and Exhibits.
(c)
Exhibits
Exhibit
      No.
Description
Exhibit
      99.1
Press
      release dated May 1, 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: May
              1,
              2006
By:
/s/ L.
              Michael Cutrer
Name:
L.
              Michael Cutrer
Title President
              and Chief Executive Officer