<PAGE>
<TABLE>
<CAPTION>
- -------- UNITED STATES SECURITIES AND EXCHANGE COMMISSION -----------------------------
FORM 3 WASHINGTON, D.C. 20549 OMB APPROVAL
- -------- -----------------------------
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES OMB Number: 3235-0104
Expires: September 30, 1998
Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Estimated average burden
Section 17(a) of the Public Utility Holding Company Act of 1935 or hours per response .... 0.5
(Print or Type Responses) Section 30(f) of the Investment Company Act of 1940 -----------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
<S><C>
1. Name and Address of Reporting Person* 2. Date of Event Re- 4. Issuer Name AND Ticker or Trading Symbol
quiring Statement
Ion Beam Applications s.a. (Month/Day/Year) SteriGenics International, Inc. (STER)
- ------------------------------------------------- ------------------------------------------------------------
(Last) (First) (Middle) June 10, 1999 5. Relationship of Reporting Person(s) 6. If Amendment, Date
----------------------- to Issuer (Check all applicable) of Original
3. IRS or Social Se- Director X 10% Owner (Month/Day/Year)
curity Number of ---- ----
Chemin du Cyclotron, 3 Reporting Person Officer (give Other (specify ---------------------
- ------------------------------------------------- (Voluntary) title below) below) 7. Individual or
(Street) ---- ---- Joint/Group Filing
(Check Applicable
Line)
--------------------------- Form filed by One
X Reporting Person
---
Form filed by
More than One
Reporting Person
B-1348 Louvain-la-Neuve Belgium ---
- ------------------------------------------------------------------------------------------------------------------------------------
(City) (State) (Zip) TABLE I -- NON-DERIVATIVE SECURITIES BENEFICIALLY OWNED
- ------------------------------------------------------------------------------------------------------------------------------------
1. Title of Security 2. Amount of Securities 3. Ownership 4. Nature of Indirect Beneficial
(Instr. 4) Beneficially Owned Form: Direct Ownership (Instr. 5)
(Instr. 4) (D) or Indirect
(I) (Instr. 5)
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock 751,300 D
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. Page 1 of 3
* If the form is filed by more than one reporting person, SEE Instruction 5(b)(v). SEC 1473 (7-97)
POTENTIAL PERSONS WHO ARE TO 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.
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
FORM 3 (CONTINUED) TABLE II - DERIVATIVE SECURITIES BENEFICIALLY OWNED (E.G., PUTS, CALLS, WARRANTS, OPTIONS, CONVERTIBLE
SECURITIES)
- ------------------------------------------------------------------------------------------------------------------------------------
<S><C>
1. Title of Derivative Security 2. Date Exer- 3. Title and Amount of Securities 4. Conver- 5. Owner- 6. Nature of Indirect
(Instr. 4) cisable and Underlying Derivative Security sion or ship Beneficial
Expiration (Instr. 4) Exercise Form of Ownership
Date Price of Deriv- (Instr. 5)
(Month/Day/ Deri- ative
Year) vative Security:
-------------------------------------------------- Security Direct
Amount (D) or
Date Expir- or Indirect
Exer- ation Title Number (I)
cisable Date of
Shares (Instr. 5)
- ------------------------------------------------------------------------------------------------------------------------------------
Irrevocable option to purchase (1) (2) (3) Common Stock 2,494,312 (4) (D)
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
Explanation of Responses:
- ------------------------------------------------------------------------------------------------------------------------------------
See Page 3 of 3 attached hereto.
- ------------------------------------------------------------------------------------------------------------------------------------
ION BEAM APPLICATIONS, S.A.
By /s/ Pierre Mottet June 21, 1999
-------------------------------- ----------------------
Pierre Mottet Date
**Intentional misstatements or omissions of facts constitute Federal **Signature of Reporting Person
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.
Potential persons who are to respond to the collection of information contained in this form are not
required to respond unless the form displays a currently valid OMB Number. Page 2 of 3
SEC 1473 (7-97)
</TABLE>
<PAGE>
Explanation of Responses:
(1) Pursuant to that certain stockholders' agreement dated June 10, 1999
(the "Stockholders' Agreement" which was filed as Exhibit 9.01 to
Amendment No. 1 of Schedule 13D filed by the Reporting Person on June
11, 1999 and incorporated in this Form 3 by reference) by and among
the Reporting Person, Ion Beam Applications G.P., IBA Acquisition
Corp. and the following stockholders: The Charles W. King, Jr.
Revocable Trust Dated December 17, 1986; The Charles W. King, III
Trust Dated April 15, 1983; The Michael James King Trust Dated April
15, 1983; The Patricia M. King Trust Dated April 15, 1983; KFFP II,
L.P.; KFFP III, L.P.; and The King Family Trust Dated December 16,
1997 (collectively, the "Stockholders"), each Stockholder granted to
the Reporting Person an irrevocable option (each, an "Option") to
purchase all the shares of the Issuer's common stock held by each of
them.
(2) The Reporting Person may exercise the Options, in whole or in part,
at any time and from time to time, following the occurrence of a
Purchase Event (as described in the Stockholders' Agreement).
(3) The Options will expire upon the Expiration Date (as defined in the
Stockholders' Agreement).
(4) The exercise price of the Options is at a purchase price per share of
common stock of the Issuer equal to the greater of $27.00 or such
higher price as may be offered by IBA Acquisition Corp. in its tender
offer for all of the outstanding shares of common stock of the Issuer.
Page 3 of 3
