摘要
本文基于三片微结构探测器设计了一种精确且便携的中子周围剂量当量/能谱监测仪,将探测器插入圆柱形聚乙烯的不同慢化深度处同时计数,并设计了中子周围剂量当量H^(*)(10)及能谱求解算法。H^(*)(10)测量采用最小相对误差二乘的修正方法,将各探测器的响应曲线拟合得到更接近标准剂量转换系数(DCC)曲线的结果,能谱测量采用新型广义回归神经网络(GRNN)解谱算法。对IAEA标准辐照环境进行测试,H^(*)(10)计算结果的平均相对误差仅为8.58%。在Am-Be参考辐射场中进行实验,3个测量点H^(*)(10)测量结果与标准值的相对误差均小于10%,解谱结果与标准能谱较相似。模拟计算结果表明,引入吸收体的方法可有效改善角响应性能。
A portable and accurate neutron ambient dose equivalent(H^(*)(10))/spectrum monitor instrument was designed based on three microstructured detectors.The detectors were embedded in different depths along the cylindrical high density polyethylene moderator and their count rates were recorded simultaneously.Besides,neutron H^(*)(10)and spectrum calculation method were designed.H^(*)(10)measurement was based on least relative error squared method,combining the response curves of detectors to approximate standard dose conversion coefficient(DCC)curve.And spectrum measurement was based on novel general regression neural network(GRNN)unfolding algorithm.IAEA radiation environment was used for test,and the mean relative error of H^(*)(10)calculation result is only 8.58%.The instrument was calibrated in Am-Be reference radiation field.The relative H^(*)(10)measurement error is within 10%at three measuring points.And the spectrum unfolding results are close to reference spectrum.The simulation result shows that applying absorber shell can effectively improve the angular response performance.
作者
周宇琳
曾乐
任才
孙光智
刘海峰
王杰
ZHOU Yulin;ZENG Le;REN Cai;SUN Guangzhi;LIU Haifeng;WANG Jie(Wuhan Second Ship Design and Research Institute,Wuhan 430064,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2021年第S01期143-150,共8页
Atomic Energy Science and Technology
关键词
中子周围剂量当量
中子解谱
广义回归神经网络
微结构探测器
Am-Be参考辐射场
neutron ambient dose equivalent
neutron spectrum unfolding
general regression neural network
microstructured detector
Am-Be reference radiation field
