两种电离室剂量仪响应时间的实验研究

Experiment and study of response time of two types of ion chamber survey meters

目的计算和实验确定两种电离室剂量仪第一量程响应时间和时间分辨修正系数。方法根据电路原理和剂量仪响应时间定义，建立计算公式并经实验数据验证。结果Fluke公司的451B型电离室剂量仪第一量程（0～50μSv／h）响应时间为13．2s，451P型电离室剂量仪第一量程（0～5μSv／h）响应时间为7．3s。结论用这两种电离室剂量仪进行放射防护检测时，应对所测数据进行时间分辨修正。

Objective To determine the response time and time resolution correct factor for the first range of both the ion chamber survey meters. Methods A formula based on the circuit theory and the definition of response time was established, and verified with experiment data. Results The response time at the first range（0-50 μSv/h） of the model 451B and the model 451P ion chamber survey meter were 13.2 s and 7.3 s, respectively. Conclusions The time resolution correct coefficients should be used to inspect the radiation protection level by both the ion chamber survey meters.