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A mercuric iodide (Hgi2) photodetector has been used to det ect li ght pulses from gamma-ray and alpha-particle interactions in scintillators. The photocurrent response of an Hgi2 photodetector to light has been measured and found to be favorable for detecting light from most scintillators, which have their maximum emission between 300 and 500 nm. Energy spectra for a lpha particles or gamma-rays from combinations of an Hgi2 photodetector with various scintillators are presented. The energy resolution of the photopeak from annihilation gamma-rays is 19% with a Csi(T1) crystal and 24% with a BGO cryst a l. Fabrication of Hgi2 photodetectors and their optical coupling to a scintillator crystal will be described. The advantages of this new solids t a t e radi:1tion detector compared to the combination of scintillator and PMT, and some proposed applications, are discussed.

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