High resolution scintillation counters

G - Physics – 01 – T

Patent

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358/31

G01T 1/20 (2006.01) G01T 1/202 (2006.01)

Patent

CA 2034237

High resolution scintillation counters comprise a flat-faced photomultiplier tube 10 optically coupled to a long scintillator rod 30 having reduced internal light reflectance 45 and a medium 55 between the photomultiplier tube and the scintillator, said medium having both an index of refraction less than that of the scintillator and the capacity to attenuate light traveling from the scintillator to the photomultiplier on the basis of the light's point of origin within the scintillator. In preferred embodiments, the medium comprises air. The scintillation counters disclosed are useful in the detection of electromagnetic radiation, especially gamma rays.

L'invention porte sur des compteurs à scintillation à grande résolution comprenant un tube photomultiplicateur plat (10) couplé de façon optique à une longue tige (30) du scintillateur ayant une réflectance (45) interne réduite et un agent (55) entre le tube photomultiplicateur et le scintillateur. L'agent présente un indice de réfraction inférieur à celui du scintillateur et a la capacité d'atténuer la lumière voyageant du scintillateur au photomultiplicateur en fonction du point d'origine de la lumière à l'intérieur du scintillateur. Dans les modèles privilégiés, l'agent est composé d'air. Les compteurs à scintillation divulgués sont utiles dans la détection des rayonnements électromagnétiques, particulièrement des rayons gamma.

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