Geometrically optimized fast neutron detector

G - Physics – 01 – V

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G01V 5/04 (2006.01) G01T 3/06 (2006.01) G01V 5/10 (2006.01)

Patent

CA 2375604

An improved fast neutron detector fabricated with alternating layers of hydrogenous, optically transparent, non scintillating material and scintillating material. Fast neutrons interact with the hydrogenous material generating recoil protons. The recoil protons enter the scintillating material resulting in scintillations. The detector is optically coupled to a photomultiplier tube which generates electrical pulses proportional in amplitude to the intensity of the scintillations, and therefore are an indication of the energy of the fast neutrons impinging upon the detector. Alternating layers of materials are dimensioned to optimize total efficiency of the detector, or to optimize the spectroscopy efficiency of the detector. The scintillating material is preferably ZnS, and the hydrogenous material is preferably plastic. The detector is ideally suited for well logging applications and fast neutron monitor applications.

Détecteur de neutrons rapides amélioré fabriqué à partir de couches alternées d'un matériau hydrogéné, transparent et non scintillant et d'un matériau scintillant. Les neutrons rapides interagissent avec le matériau hydrogéné, ce qui génère des protons de recul. Les protons de recul pénètrent le matériau scintillant, ce qui entraîne des scintillations. Le détecteur est optiquement raccordé à un tube photomultiplicateur qui génère des impulsions électriques d'une amplitude proportionnelle à l'intensité des scintillations, ce qui donne une indication de l'énergie des neutrons rapides qui touchent le détecteur. Les dimensions des couches alternées de matériaux optimisent l'efficacité globale du détecteur ou son efficacité spectroscopique. Le matériau scintillant est de préférence du sulfure de zinc, et le matériau hydrogéné est de préférence du plastique. Le détecteur est idéalement conçu pour la diagraphie de sondage et la surveillance des neutrons rapides.

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