American Science and Engineering, Inc. Announces $6 Million Award for Proprietary High-Energy Linear Accelerators.

Business/Technology Editors

BILLERICA, Mass.--(BUSINESS WIRE)--Feb. 3, 2003

AS&E's High Energy Systems Division is Pioneering the Use of Linear

Accelerators for Medical and Force Protection Applications

American Science and Engineering, Inc. (AMEX: ASE), leader in X-ray detection technology, announced today an order for multiple linear accelerators totaling $6 million for its High Energy Systems (HES) Division. This is the first order received under a long term Blanket Purchase Agreement between American Science and Engineering (AS&E(R)) and Accuray Incorporated executed in November 2002. The linear accelerators will be delivered over a 12-month period, commencing in May 2003. The accelerators will be manufactured for Accuray, and used in stereotactic radiosurgery.

Ralph Sheridan, AS&E CEO and President, commented, "We are proud to be a partner in supporting the pioneering efforts of Accuray in non-invasive treatment of difficult tumors. Accuray has selected our High Energy Systems Division's linear accelerator because of its compact design and uniformity of output energy. Accuray utilizes collimated beams of high-energy radiation precisely measured, timed, aimed and discharged from a three dimensional variety of directions. The compact X-band linear accelerator is integrated with a robot and software to deliver lethal doses of radiation to lesions with minimal damage to healthy tissue.

"The High Energy Systems Division is also building the 3.5 MeV linear accelerator for AS&E's Shaped Energy(TM) Cargo Inspection Systems. The unique design provides over 300 millimeters of steel penetration in order to image through dense maritime cargoes with minimal radiation to the surrounding environment. Shaped Energy is the cornerstone of AS&E's product line for Homeland Security at ports and borders and military bases for force protection applications."

Euan Thomson, Ph.D., Accuray's CEO and President commented, "AS&E's High Energy Systems Division has been a long term supplier of linear accelerators to Accuray. We are delighted with this new contract which will enable Accuray and AS&E to plan for the rapidly increasing demand for our product."

About AS&E(R): AS&E develops and manufactures sophisticated X-ray inspection products for critical detection and security applications. These systems are solving an expanding range of inspection problems including detecting car and truck bombs, combating weapons smuggling, and imaging cargo to expose trade fraud and illegal immigration. AS&E's patented Z(R) Backscatter technology detects plastic explosives, illegal drugs, and other contraband, even when artfully concealed in complex backgrounds by terrorists and smugglers. AS&E's Shaped Energy(TM) X-ray inspection systems combine material discrimination features of Z(R) Backscatter imaging with the penetration capability of high-energy X-rays for dense cargoes. AS&E's High Energy Systems Division manufactures linear accelerators for a variety of applications including medical, scientific, security, electron beam curing and non-destructive testing. For more information on AS&E products and technologies, please visit http://www.as-e.com.

About Accuray: Accuray Incorporated is a privately held corporation located in Sunnyvale, California, the heart of Silicon Valley. The company designs, manufactures and distributes the CyberKnife(R) Stereotactic Radiosurgery System in the USA and certain International markets. Accuray is dedicated to enabling full body radiosurgery using image-guided robotics and to making this technology available to physicians throughout the world. For more information on Accuray, please visit http://www.accuray.com.

Safe Harbor Statement: The foregoing press release contains statements concerning AS&E's financial performance, markets and business operations that may be considered "forward-looking" under applicable securities laws. AS&E wishes to caution readers of this press release that actual results might differ materially from those projected in any forward-looking statements. Factors which might cause actual results to differ materially from those projected in the forward-looking statements contained herein include the following: significant reductions or delays in procurements of the Company's systems by the United States and other governments; disruption in the supply of any sole-source component incorporated into the AS&E's products (of which there are several); litigation seeking to restrict the use of intellectual property used by the Company; potential product liability claims against the Company; global political trends and events which affect public perception of the threat presented by drugs, explosives and other contraband; global economic developments and the ability of governments and private organizations to fund purchases of the Company's products to address such threats; and the potential insufficiency of Company resources, including human resources, capital, plant and equipment and management systems, to accommodate any future growth. These and certain other factors which might cause actual results to differ materially from those projected are more fully set forth under the caption "Forward-Looking Information and Factors Affecting Future Performance" in the Company's Annual Report on Form 10-K for fiscal year ending March 31, 2002.