抄録
Properties of CdS crystals were investigated under irradiation by β-rays from 10 mc of Sr90 or from the accelerator of Van de Graaff type and γ-rays from 1 c of Cs137 or from 200 c of Co60. The ohmic contact of electrodes and the crystal uniformity were first inspected, and some properties concerning the induced conductivity of CdS crystals by β- and γ-rays were discussed in comparison with those observed when the crystals were irradiated by visible light. It has been concluded that the sample crystals grown by the author’s method are uniform and that they have low trap density and high sensitivity for β- or γ-rays. It was also shown that the elementary phenomena of the induced conductivity in the case of β- or γ-ray irradiation were quite similar to those in the case of visible-light irradiation, and that the number of electrons excited into the conduction band by a β-particle was about one hundred times larger than that by a γ-particle of 1.3∼1.5 Mev.
