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Among the top priorities for high-energy astronomy in the coming decade aresensitive surveys in the hard X-ray/soft \gamma-ray (10-600 keV) andmedium-energy \gamma-ray (0.2-80 MeV) bands. Historically, observations in thesoft and medium energy \gamma-ray bands have been conducted using detectorsbased on inorganic scintillators read out by photo-multiplier tubes (PMTs).These observations were limited by the modest energy and time resolution oftraditional scintillator materials (e.g. NaI and CsI), and by the demands onmission resources imposed by the bulky, fragile, high-voltage PMTs. Recenttechnological advances in the development of both new scintillator materials(e.g. LaBr3:Ce, L(Y)SO) and new scintillation light readout devices (e.g.Silicon Photo-Multipliers) promise to greatly improve the observationalcapabilities of future scintillator-based \gamma--ray telescopes, whileretaining the relative simplicity, reliability, large collection volumes, andlow-cost of scintillator instruments. We present initial results of a study onthe use of silicon photomultipliers in the calorimeter module design of theproposed GRIPS astrophysics mission.

Study of silicon photomultipliers for the readout of scintillator crystals in the proposed GRIPS \gamma-ray astronomy mission