Abstract
Properties of CdS crystais were investigated under irradiation by BETA rays from 10 mc of Sr/sup 90/ or from an accelerator of the Van de Granff type and gamma rays from 1 c of Cs/sup 137/ or from 200 c of Co/sup 60/. The ohmic contact of electrodes and the crystal uniformity were first inspected, and some properties concerning the induced conductivity of CdS crystals by BETA and gamma rays were discussed in comparison with those observed when the crystals were irradiated by visible light. It was concluded that the sample crystals grown are uniform and that they have low trap density and high sensitivity for BETA or gamma rays. It was also shown that the elemertary phenomema of the induced conductivity in the case of BETA or gamma ray irradiation were quite simliar to those in the case of visible-light irradiation, and that the number of electrons excited into the conduction band by a BETA particle was about one hundred times larger than that by a gamma particle of 1.3 to 1.5 Mev. (auth)
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