Gamma-ray irradiation effects on CdTe solar cell dosimeter

Abstract Compact and radiation-tolerant radiation dosimeter without bias voltage application using solar cells such as CdTe was proposed for severe radiation environment near a nuclear reactor pressure vessel. In this work, γ -ray tolerance and γ -ray detection characteristics of CdTe solar cells were investigated. It was found that the CdTe solar cell has sufficient tolerance against γ -ray exposure up to 3 MGy. It was demonstrated that γ -ray induced current density linearly increased with increasing γ -ray intensity in the range up to approximately 1.5 kGy h −1 . This result indicates that high dose-rate radiation detection can be performed using solar cells without voltage application. In addition, γ -ray sensitivity was successfully improved by a stack of CdTe solar cells with parallel connections. Furthermore, γ rays can be detected with high responsivity and small noise even under a high flux neutron environment.