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                               EXCHANGE AGREEMENT


         THIS EXCHANGE AGREEMENT (this "AGREEMENT") is entered into as of
February 11, 2002, by and between SUREBEAM CORPORATION, a Delaware corporation
("SUREBEAM"), and THE TITAN CORPORATION, a Delaware corporation ("TITAN").

                                    RECITALS

         Titan is the holder of a Subordinated Promissory Note dated August 4,
2000 in a principal amount not to exceed $75,000,000 issued by SB Operating Co.,
a wholly owned subsidiary of SureBeam (the "NOTE"). The parties hereto desire to
exchange principal advanced on the Note through December 31, 2001 plus all
interest accrued and unpaid on the Note through December 31, 2001 ("DEBT") for
shares (the "SHARES") of SureBeam's Class B Common Stock, par value $0.001 per
share to the extent available for issuance, and SureBeam's Class A Common Stock,
par value $.001 per share, in the amount and on the terms and conditions set
forth in this Agreement.

                                    AGREEMENT

         SureBeam and Titan, in consideration of the mutual promises contained
herein and intending to be legally bound, hereby agree as follows:

         SECTION 1. EXCHANGE OF NOTE FOR SHARES; ALLOCATION OF SHARES;

         1.1 Subject to and effective as of Titan's receipt of the consent (the
"BANK CONSENT") of the requisite number of lenders under its Senior Secured
Credit Agreement dated as of February 23, 2000 and as subsequently amended (the
"CREDIT AGREEMENT") to the Exchange (as defined below) and (ii) the release (the
"RELEASE") of the lenders' security interests in the Note, including the pledge
of the Note to them, under the Credit Agreement's ancillary security agreements,
Titan shall exchange the Debt (the "EXCHANGE") for the number of Shares equal to
the quotient of (y) the total dollar amount of the Debt, as set forth on a
certificate to be delivered by Titan and verified by SureBeam, divided by (z)
the average closing price of one share of SureBeam's Class A Common Stock as
quoted on the Nasdaq National Market over the twenty trading days ending on the
day immediately preceding the date of the Bank Consent and SureBeam shall
deliver the Shares to Titan. The principal amount of the Debt exchanged shall be
deemed permanently retired under the Note. Each of Titan and SureBeam
acknowledges and agrees that Titan's obtaining each of the Bank Consent and the
Release shall be a condition precedent to the Exchange, and that neither party
shall have any obligation to consummate the Exchange in the absence of Titan's
obtaining the Bank Consent and the Release. SureBeam will pay Titan cash for any
fractional shares in lieu of issuing fractional shares.

         1.2 The Shares to be delivered by SureBeam to Titan upon settlement
of the Exchange shall consist of (a) SureBeam's Class B Common Stock in an
amount up to the maximum number of authorized but unissued shares of Class B
Common Stock as of the date of this Agreement under SureBeam's amended and
restated certificate of incorporation (such maximum number of shares, (the
"MAXIMUM CLASS B SHARES") and (b) shares of SureBeam's

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Class A Common Stock to the extent that the number of Shares calculated
pursuant to clauses (y) and (z) of Section 1.1 above exceeds the Maximum
Class B Shares.

         SECTION 2. REPRESENTATIONS, WARRANTIES, ACKNOWLEDGEMENTS AND AGREEMENTS
OF TITAN. Titan hereby represents, warrants, acknowledges and agrees, for the
benefit of SureBeam, as follows:

         2.1 Titan initiated contact and negotiations with SureBeam regarding
the Exchange, without any indications from SureBeam or its representatives or
agents that SureBeam was interested in pursuing any transaction with Titan or
any other party, including any transaction similar to the Exchange.

         2.2 The Exchange is intended to qualify for the exemption from the
registration requirements of the Securities Act of 1933, as amended (the
"SECURITIES ACT"), provided by Section 3(a)(9) of the Securities Act. Titan has
not paid or given, directly or indirectly, any commission or other remuneration
directly or indirectly for soliciting the Exchange.

         2.3 Titan is and will be at the date of settlement of the Exchange an
accredited investor within the meaning of Regulation D under the Securities Act.

         2.4 Titan, by reason of its, or its management's, business, financial
or investment experience, has the capacity to evaluate the risks of increasing
its equity ownership position in SureBeam and other risks involved in the
Exchange and to protect its own interests in connection with the Exchange.

         2.5 Titan and its representatives and agents have had the opportunity
to obtain from SureBeam and its representatives all information relating to
SureBeam, SB Operating Co., the Note, SureBeam's Class B Common Stock and/or
SureBeam's Class A Common Stock, including information that may be material
non-public information, and SureBeam and its representatives have provided Titan
and its representatives and agents with opportunities to discuss with them all
such information, including possible material non-public information.

         2.6 Titan is the sole legal and beneficial owner of the Note.

         2.7 Each of Titan and its representatives and agents have complied and
will continue to comply with all applicable securities laws in connection with
its acquisition of the Shares pursuant to the Exchange and any subsequent
disposition of the Shares.

         2.8 Titan (a) is a legal entity duly organized and validly existing
under the laws of its jurisdiction of organization, (b) has all of the power and
authority necessary to enter into the Exchange and to consummate the Exchange,
and (c) has taken all action as may be necessary to authorize the execution and
delivery of this Agreement and the consummation of the Exchange and the
performance of its obligations hereunder.

         2.9 This Agreement constitutes the legal, valid and binding obligation
of Titan, and is enforceable against Titan in accordance with its terms.

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         SECTION 3. REPRESENTATIONS, WARRANTIES, ACKNOWLEDGEMENTS AND AGREEMENTS
OF SUREBEAM. SureBeam hereby represents, warrants, acknowledges and agrees, for
the benefit of Titan, as follows:

         3.1 SureBeam (a) is a legal entity duly organized and validly existing
under the laws of its jurisdiction of organization, (b) has all of the power and
authority necessary to enter into the Exchange and to consummate the Exchange,
and (c) has taken all action as may be necessary to authorize the execution and
delivery of this Agreement and the consummation of the Exchange and the
performance of its obligations hereunder.

         3.2 This Agreement constitutes the legal, valid and binding obligation
of SureBeam, and is enforceable against SureBeam in accordance with its terms.

         3.3 Upon issuance of the Shares by SureBeam to Titan, the Shares shall
be validly issued, fully paid and nonassessable, shall not be issued in
violation of any preemptive rights of any stockholder of SureBeam and shall be
free and clear of all Liens, other than any Liens created by any action or any
inaction of Titan.

         3.4 The Exchange is intended to qualify for the exemption from the
registration requirements of the Securities Act provided by Section 3(a)(9) of
the Securities Act. SureBeam has not paid or given, directly or indirectly, any
commission or other remuneration directly or indirectly for soliciting the
Exchange.

         SECTION 4. MISCELLANEOUS.

         4.1 HEADINGS. The headings contained in this Agreement are for
convenience of reference only, shall not be deemed to be a part of this
Agreement and shall not be referred to in connection with the construction or
interpretation of this Agreement.

         4.2 COUNTERPARTS. This Agreement may be executed in several
counterparts, each of which shall constitute an original and all of which, when
taken together, shall constitute one agreement. Delivery of an executed
signature page to this Agreement by facsimile transmission shall be as effective
as delivery of a manually signed counterpart of this Agreement.

         4.3 GOVERNING LAW; VENUE.

                  (a) This Agreement shall be construed in accordance with, and
governed in all respects by, the internal laws of the State of California
(without giving effect to principles of conflicts of laws).

                  (b) Any legal action or other legal proceeding relating to
this Agreement or the enforcement of any provision of this Agreement may be
brought or otherwise commenced in any state or federal court located in San
Diego County, California. Each party to this Agreement:

                           (i) expressly and irrevocably consents and submits to
the jurisdiction of each state and federal court located in San Diego County,
California (and each appellate court located in the State of California) in
connection with any such legal proceeding;

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                           (ii) agrees that each state and federal court located
in San Diego County, California, shall be deemed to be a convenient forum; and

                           (iii) agrees not to assert (by way of motion, as a
defense or otherwise), in any such legal proceeding commenced in any state or
federal court located in San Diego County, California, any claim that such party
is not subject personally to the jurisdiction of such court, that such legal
proceeding has been brought in an inconvenient forum, that the venue of such
proceeding is improper or that this Agreement or the subject matter of this
Agreement may not be enforced in or by such court.

         4.4 SUCCESSORS AND ASSIGNS. This Agreement shall be binding upon, and
shall inure to the benefit of, Titan, SureBeam and their respective permitted
successors and assigns. Each of Titan and SureBeam may assign any or all of its
rights under this Agreement or delegate any or all of its obligations under this
Agreement, in whole or in part, to any other entity or person only with the
prior written consent of the other party to this Agreement and any other
required consents from other entities or persons, it being understood that a
mere change in the equity ownership of Titan or SureBeam that does not cause
Titan or SureBeam, as applicable, to cease to exist shall not be deemed an
assignment or delegation under this Agreement.

         4.5 REMEDIES CUMULATIVE; WAIVER.

                  (a) The rights and remedies of the parties hereto shall be
cumulative (and not alternative).

                  (b) No failure on the part of any entity or person to exercise
any power, right, privilege or remedy under this Agreement, and no delay on the
part of any entity or person in exercising any power, right, privilege or remedy
under this Agreement, shall operate as a waiver of such power, right, privilege
or remedy; and no single or partial exercise of any such power, right, privilege
or remedy shall preclude any other or further exercise thereof or of any other
power, right, privilege or remedy.

         4.6 AMENDMENTS. This Agreement may not be amended, modified, altered or
supplemented other than by means of a written instrument duly executed and
delivered on behalf of the parties hereto.

         4.7 SEVERABILITY. In the event that any provision of this Agreement, or
the application of any such provision to any entity or person or set of
circumstances, shall be determined to be invalid, unlawful, void or
unenforceable to any extent, the remainder of this Agreement, and the
application of such provision to entities or persons or circumstances other than
those as to which it is determined to be invalid, unlawful, void or
unenforceable, shall not be impaired or otherwise affected and shall continue to
be valid and enforceable to the fullest extent permitted by law.

         4.8 ENTIRE AGREEMENT. This Agreement sets forth the entire
understanding of the parties relating to the subject matter hereof and
supersedes all prior agreements and understandings between any of the parties
relating to the subject matter hereof.

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         The parties hereto have caused this Agreement to be executed and
delivered as of the date first above written.

                                        SUREBEAM CORPORATION,
                                        a Delaware corporation


                                        By:  /s/ David Rane
                                             -----------------------------------

                                        Title: Senior Vice President
                                               Chief Financial Officer
                                              ----------------------------------


                                        THE TITAN CORPORATION,
                                        a Delaware corporation



                                        By:  /s/ Mark W. Sopp
                                             -----------------------------------

                                        Title: Senior Vice President
                                               Chief Financial Officer
                                              ----------------------------------

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