FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

SABIN JOHN 		2. Issuer Name and Ticker or Trading Symbol

NORTH AMERICAN SCIENTIFIC INC [ NASM ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

20200 SUNBURST STREET 		3. Date of Earliest Transaction (MM/DD/YYYY)

4/29/2008
(Street)

CHATSWORTH, CA 91311
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
STOCK OPTION   $0.33   4/29/2008     A     50000   (1)      4/29/2009   4/29/2015   Common Stock   50000   (1) $0   50000   (1) D    
STOCK OPTION   $.42   4/29/2008     A     150000   (1)        (2) 4/29/2015   Common Stock   150000   (1) $0   150000   (1) D    
STOCK OPTION   $1.23   4/29/2008     D        15000   (1)     (3) 6/5/2017   Common Stock   15000   (1)   (4) 0   D    
STOCK OPTION   $1.92   4/29/2008     D        15000   (1)     (5) 5/3/2016   Common Stock   15000   (1)   (4) 0   D    
STOCK OPTION   $3.18   4/29/2008     D        25000   (1)     (6) 8/5/2015   Common Stock   25000   (1)   (4) 0   D    

Explanation of Responses:
( 1)  The number of securities does not reflect the effect of a reverse stock split of the issuer's common stock in a ratio of 1-for-5, effective May 1, 2008.
( 2)  The stock option vests in twelve equal quarterly installments following April 29, 2008.
( 3)  The stock option became exercisable in three equal annual installments commencing June 5, 2008.
( 4)  In exchange for a new single option to purchase 150,000 shares of common stock having an exercise price of $0.42, the reporting person agreed to cancellation of options granted to him on August 5, 2005, May 3, 2006 and June 5, 2007.
( 5)  The stock option became exercisable in three equal annual installments commencing May 3, 2007.
( 6)  The stock option became exercisable in three equal annual installments commencing August 5, 2006.

Remarks:
EXHIBIT LIST

Exhibit 24.1 Power of Attorney

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
SABIN JOHN
20200 SUNBURST STREET
CHATSWORTH, CA 91311 		X



Signatures
/s/Bruce Feuchter under Power of Attorney for John Sabin 4/29/2008
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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