Gamma ray detector with interaction depth coding

G - Physics – 01 – T

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G01T 1/202 (2006.01) G01T 1/164 (2006.01)

Patent

CA 2521900

Gamma ray detector characterized in that its structural elements are a continuous scintillator crystal, a position sensitive photodetector and associated electronics intended to calculate, in addition to the gamma ray energy in the position of its interaction in the crystal, the interaction depth in the crystal from the standard deviation of the scintillation light distribution. Said information may be obtained electronically, in analog form and therefore instantaneous, from the first three moments of the scintillation light distribution. A method for implementing said electronics by way of a network of resistances characterized for analog and simultaneous computation of the first and second distribution moments is also disclosed.

La présente invention concerne la configuration d'un détecteur de rayons gamma se caractérisant par les éléments structurels suivants: un cristal scintillateur continu, un photodétecteur sensible à la position et un dispositif électronique associé permettant de calculer, en plus de l'énergie du rayon gamma et de la position d'interaction dans le cristal, la profondeur d'interaction dans celui-ci à partir de la déviation standard de la distribution de la lumière de scintillement. Ladite information peut être obtenue par voie électronique, de manière analogique et, par conséquent, instantanée, à partir des trois premiers moments de distribution de la lumière de scintillement. L'invention concerne, de plus, un procédé de mise en oeuvre dudit dispositif électronique au moyen d'un réseau de résistances, se caractérisant par le calcul analogique et simultané du 1er et du 2ème moment de distribution.

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