ν射线参考辐射周围剂量当量标准电离室的蒙特卡罗模拟

由放射源^137Cs和^60Co产生的ν射线参考辐射在辐射监测仪表的校准中起着重要作用。对于场所辐射监测仪表的校准，参考辐射需提供周围剂量当量H^＊（10）的约定真值。本研究采用H^＊（10）标准电离室法测定周围剂量当量H^＊（10）的约定真值，利用MCNP4C蒙特卡罗模拟程序，提出了基于双金属补偿法的电离室结构设计方案。结果表明，在15～1500keV能量范围内，该电离室能量响应满足国际标准ISO4037—4的要求，该研究结果对H^＊（10）标准电离室的建立具有重要的指导作用。

Monte Carlo Simulation of a Ambient Dose Equivalent Standard Ionization Chamber for Gamma Reference Radiation

Gamma reference radiation produced by isotope sources ^137 Cs and 60 Co is very necessary for calibration of radiation dosimeter. For the calibration of area monitoring dosimeter, reference radiation must provide the conventionally true value of the ambient dose equivalent H^＊（10）. According to the recommendation given in the international standard ISO 4037-4, the conventionally true value of H^＊（10）could be obtained by two methods, one is spectrum method, the other is H^＊（10） standard ionization chamber methed. In order to establish a standard chamber which could meet the requirements of ISO4037-4, a design for H^＊ （10） standard chamber was established by MCNP4C Monte Carlo simulation program. The results showed that the energy response of the ionization chamber satisfied the requirement of international standard ISO4037-4 from 15 keV to 1 500 keV, the conclusion of this study was good to the establishment of H^＊（10） secondary standard ionization chamber.