(19)

(11)

EP 1 269 166 A2

(12)

(88) Date of publication A3: 27.06.2002 (43) Date of publication: 02.01.2003 Bulletin 2003/01 (21) Application number: 01932513.3 (22) Date of filing: 27.03.2001

(51) International Patent Classification (IPC)7: G01N 23/20, G21K 5/04, G01N 23/225 (86) International application number: PCT/US0109/784 (87) International publication number: WO 0107/3415 (04.10.2001 Gazette 2001/40)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR (30) Priority: 28.03.2000 US 192425 P (71) Applicant: American Science & Engineering, Inc. Billerica, MA 01821 (US)	(72) Inventor: GRODZINS, Lee Lexington, MA 02173 (US) (74) Representative: Froud, Clive et al Elkington and FifeProspect House8 Pembroke Road Sevenoaks, Kent TN13 1XR Sevenoaks, Kent TN13 1XR (GB)