摘要
随着伴生放射性矿开采利用、核技术应用、核工业发展,核与辐射应急准备成为监管和行业部门的一项重要工作。就地谱仪具备快速现场监测能力,成为一种重要应急设备。应急准备工作中,必须对就地谱仪角度修正因子和标准偏差进行校准。采用MCNP模拟计算和试验验证,建立一种就地P型HPGe谱仪探测器模型。依据平面源模型,MCNP模拟计算不同探测器高度、不同角和不同γ能量的相同半径平面源的探测效率,以及模拟计算相同探测器高度、不同角、不同γ能量的不同半径平面源的探测效率,进而分析其角响应因子、角度修正因子和相对标准偏差。研究结果表明,探测器高度1 m、2 m、3 m、4 m情况下,其角响应因子和角度修正因子相对标准偏差小于2.5%;平面源半径3.5 cm、4.0 cm、4.4 cm情况下,其角响应因子和角度修正因子相对标准偏差小于1.7%;其角度修正因子是能量的自然对数的分段函数,在45~120 keV为指数函数,在120~3000 keV为线性函数。
With the exploitation and utilization of associated radioactive ore,the application of nuclear technology and the development of nuclear industry,nuclear and radiation emergency preparedness has become an important work in the regulatory and industrial sectors.The local spectrometer has the ability of rapid field monitoring and has become an important emergency equipment.The Angle correction factor and standard deviation of local spectrometer must be calibrated in emergency preparation.A detector model of P type HPGe in situ spectrometer is established by MCNP simulation calculation and test verification.According to the plane source model,MCNP simulates the detection efficiency of the same radius plane source with different detector height,different Angle and differentγenergy,and simulates the detection efficiency of the same detector height,different Angle and differentγenergy with different radius plane source,and then analyzes the angular response factor,Angle correction factor and relative standard deviation.The results show that the relative standard deviation of the angular response factor and the Angle correction factor is less than 2.5%when the detector height is 1 m,2 m,3 m and 4 m.When the radius of plane source is 3.5 cm,4.0 cm and 4.4 cm,the relative standard deviation of Angle response factor and Angle correction factor is less than 1.7%.The Angle correction factor is a piecewise function of the natural logarithm of energy,which is an exponential function from 45 keV to 120 keV and a linear function from 120 keV to 3000 keV.
作者
杜云武
邓晓钦
王亮
王茜
周俊宇
朱小铰
徐僳
刘朗
DU Yunwu;DENG Xiaoqin;WANG Liang;WANG Qian;ZHOU Junyu;ZHU Xiaojiao;XU Su;LIU Lang(Sichuan provincial radiation environment management and monitoring center station,Chengdu,610031,China)
出处
《核电子学与探测技术》
CAS
北大核心
2023年第3期593-603,共11页
Nuclear Electronics & Detection Technology
基金
生态环境部2021年度国控网络辐射环境监测技术方法研究重点支持课题《就地高纯锗γ谱仪在现场监测领域的应用研究》,项目编号:2021-5资助。
关键词
就地P型HPGe
角响应因子
角度修正因子
相对标准偏差
平面源模型
in situ P type HPGe
angular responsefactor
angular correction factor
relative standard deviation
plane source model
