G - Physics – 21 – F
Patent
G - Physics
21
F
349/30, 349/35
G21F 5/00 (2006.01) G01S 7/52 (2006.01) G09F 3/03 (2006.01) H04R 17/00 (2006.01)
Patent
CA 1146255
ABSTRACT OF THE DISCLOSURE: A system, suitable for use as an identity seal for an object, such as a container for fissile material, comprises a body including a cap for fitting over one end of the object, and a recess which contains a material such as "ARALDITE" (Trademark) or aluminium acting as a matrix for a plurality of inclusions of e.g. bronze embedded therein in a random confi- guration. The recess is closed by a cover which includes a central electrically conductive part. Also embedded in the matrix material and constituting further "inclusions" are two piezo electric crystal transducers each electrically connected to the central cover part. In use, the transducers are elec- trically connected via the central cover part to external ultrasonic testing apparatus to provide a unique output indi- cative of the particular structure of the seal particularly the inclusion configuration and hence providing a unique "identity" and hence indication of integrity for the seal. Tampering with and/or removal of the seal will change its structure in some way so that subsequent ultrasonic testing produces a different output, revealing the occurrence of the unauthorized event.
350511
Crutzen Serge
Dal Cero Joseph
Denis Rene
European Atomic Energy Community (euratom)
Robic Robic & Associes/associates
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