基于双GM计数管设计的宽量程伽马剂量计性能初步测试

Primary Testing Performance of Designed Wide-dynamic Range Gamma Ray Dosimeter Based on Double GM Counters

摘要: 为在核事故中使用机器人定位和抓取丢失的伽马放射源，本文初步设计了一款基于双GM（GeigerMüller）计数管（ZP1321，ZP1301）的宽量程伽马剂量计。设计了用于探测器信号处理的前端模拟电路和基于微控制器的数据处理和传输程序等，并使用137Cs伽马放射源对设计的系统进行了初步测试。测量并分析了影响剂量计输出信号的主要因素。初步实验结果表明，所设计的无屏蔽壳的伽马剂量计可成功地在线检测伽马放射源。

Abstract: For locating and grasping the lost gamma ray source with a robot in a nuclear accident, a gamma ray dosimeter based on double GM (GeigerMüller) counters (ZP1321, ZP1301) was primarily designed with widedynamic range. The frontend analogue circuits for detector signal processing and the microcontrollerbased detector data processing and transmission programs were designed and tested primarily with 137Cs gamma ray source. The main influence factors on the designed dosimeter output signal were measured and analyzed. The primary experimental results show that the designed gamma ray dosimeter without shielding case can detect gamma ray radiation sources online successfully.