核设施β-γ混合场中定向剂量当量率■′(3)的现场监测方法

The on-site monitoring method of directional dose equivalent rate ■ mixed field of nuclear facilities

本文主要介绍核设施β-γ混合场中定向剂量当量率■的现场监测方法。基于研制的ZF-D300型定向剂量当量率■监测仪,利用γ标准辐射场、β标准辐射场、以及组合的β-γ标准辐射场,测量给出了监测仪器对γ射线和β射线的响应特性。结合周围剂量当量率仪、β谱仪和γ谱仪测量数据,给出了β-γ混合场中测量■的数据处理方法。在实验室建立的标准β-γ辐射场中,采用本文中数据处理方法测量计算的■值,与标准装置给出的■约定真值相对偏差小于±1%。在某核电站大修期间,对该β-γ混合场中监测■的方法进行了应用。

The field monitoring method of directional dose equivalent rateH · '( 3) in β-γ mixed field in nuclear facilities is introduced. Based on the developed directional dose equivalent rate meter of ZF-D300 ,its response characteristics to gamma rays and beta rays in γ standard radiation field,β standard radiation field and combined β - γ standard radiation field are given. Combined with the data of ambient dose equivalent rate meters,beta spectrometer and gamma spectrometer,the data processing method for measuring H · '( 3) in β-γ mixed field is given. In the standard β -γ radiation field established in the laboratory,the difference of the H · '( 3) values measured by the extrapolation ionization chamber of the standard instrument and this data processing method is less than 1%. During the outage of a nuclear power plant,the method of monitoringH · '( 3) in the β-γ mixed field is applied.