Lots of import portable survey meters are used in internal NPP nowadays, but the maintenance ex-pense are usually too high.The MPR200 which uses moving average algorithm and cathode switch can discrimi-nate different probes automatically.This paper focused on the development of environmental gamma probe which process the signal by CD4528 for two stage amplifier, and can continue to work for 50 hours because of the large capacity lithium battery.%现在国内各核电站日常使用的便携式辐射测量仪表普遍是进口的，存在售价和维修成本高且返修周期长的问题，因此开发了一款MPR200多探头辐射测量仪。仪器主机采用双GM管阴极切换设计，可自动识别多种外接探头，软件采用滑动平均数据处理方法实现剂量率快速测量。本文重点介绍外接环境γ探头的研制，它采用两级放大，通过CD4528型双单稳态集成电路处理信号并输出，大容量的锂电池可保证整机连续工作50个小时以上。
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