Radiation measurements by a cryogenic pn junction InSb detector with operating temperatures up to 115 K

Pn junction-type radiation detectors were fabricated with an InSb substrate. The detectors had 1000 times higher resistances than those of previously reported Schottky-type detectors. The output pulses of the preamplifier were analyzed from the point of view of the contribution of electrons and holes. The energy spectra of 241 Am alpha particles were measured at operating temperatures of up to 115 K. The inherent voltage of the detector was estimated.