Calculating the optimum shape of a lightguide for collecting light from a fine-grained, large-area scintillator based on a Si photodiode

This paper discusses the transmission of light by lightguides of complex sh ape in scintillator-lightguide-photoreceiver detectors. The optimum lightgu ide design is chosen for use in a fine-grained ZnSe(Te) scintillation detec tor. It is established that. to use such detectors in the counting regime, the light output from a large-area photodiode-based scintillator is optimiz ed by using a transparent lightguide in the form of a wedge on one side sur face of which the scintillator is deposited. For use in the spectrometric r egime, it is promising to use a lightguide with a spherical input surface, which optimizes the homogeneity of the transmittance over the surface of th e scintillator. (C) 2001 The Optical Society of America.