γ吸收剂量率在线探测用硅光电池的电学性能研究

建立了一种γ吸收剂量率实时在线测量系统,研究了半导体硅光电池BBZSGD-4辐射光生电流和γ吸收剂量率之间的关系,并对其耐辐照性能进行了研究。60 Coγ辐照实验表明:半导体硅光电池BBZSGD-4对60 Co的γ射线有较好的响应,其辐射光生电流与吸收剂量率的关系呈线性规律。当吸收剂量率为94.54Gy/min时,辐射光生电流可达1.26μA。在吸收剂量率为50Gy/min时,辐射光生电流随总吸收剂量的增加呈指数下降,总吸收剂量为5 445.8Gy时,其辐射光生电流衰减1%。半导体硅光电池BBZSGD-4具有作为实时在线低吸收剂量率探测器的潜力。

Electrical Behavior Research of Silicon Photo-cell Used in Online Monitoring Absorbed Dose Rate of γ-ray

The real-time online monitoring system for γ-ray absorbed dose rate was established to study the relationship between the photocurrent of semi-conductive silicon photo-cell BBZSGD-4 and γ-ray absorbed dose rate under the open circuit. The radioactive experiments in ⁶⁰Co γ radiation field show that photo-cell BBZSGD-4 has good response to ⁶⁰Co γ-ray, and their relationship accords with the linear law. The photocurrent of photo-cell can be up to 1.26 μA when the absorbed dose rate is 94.54 Gy/min. The relationship between photocurrent and the absorbed dose accords with exponential law when absorbed dose rate is 50 Gy/min, and the attenuation of photocurrent is 1% when the absorbed dose is 5 445.8 Gy. Thus photo-cell BBZSGD-4 has the potential to be a real-time detector to detect low absorbed dose rate in ⁶⁰Co γ radiation field.