Importance

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Abstract

An apparatus and method are provided for determining the X, Y and Z positions of a point of gamma ray induced light emission in a pattern of a plurality of scintillating light guides. A plurality of spatially separated, scintillating, crystal, light guides are arrayed in a pattern having known X and Y positions with each of the light guides having a gamma ray receiving end, a light transmitting end, and walls therebetween. A light reflective surface is disposed on at least a portion of the walls having light reflectivity such that a total fraction of light passing through a transmitting end is substantially greater for gamma ray induced light emissions closer to the transmitting end and substantially less for emissions closer to the receiving end. One or more photodetectors are disposed in register with ends of the light guides such that light transmitted therethrough is intercepted by the photodetectors and a detector device determines the excited light guide to thereby establish the X and Y positions of the light within the pattern of light guides. A measuring device is responsive to intercepted light for determining the amount of light and from that determined amount of light determining the position from the transmitting end to the point of induced light emission in the excited light guide, to thereby establish the Z position of the gamma ray induced light within the pattern of light guides.

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First Claim