Abstract
A large volume radiation detectors using a semi-insulating Indium Phosphide (InP) wafer have been developed for Indium Project on Neutrino Observation for Solar interior (IPNOS) experiment. The volume has achieved to 20mm3, and this is world largest size among InP detector observed γs at one hundred keV region. Most of charge are induced by moving carriers, and the charge collection efficiency and the energy resolution are obtained by 60% and 25%, respectively. We measured actual backgrounds related to 115In β decay, and no significant background was found.
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