MCNP中高斯展宽系数的确定方法与验证  

The Determination Method of MCNP Gaussian Broadening Coefficient and Validation

作　　者：李福龙[1,2] 张雄杰[1,2] 王仁波[1,2] 

机构地区：[1]教育部核技术应用工程研究中心(东华理工大学),江西南昌330013 [2]东华理工大学,江西抚州344000

出　　处：《核电子学与探测技术》2013年第10期1266-1270,共5页Nuclear Electronics & Detection Technology

基　　金：国家高技术研究发展计划(863计划)(2012AA061804);江西省科技攻关计划(20111BBE50025);国家自然科学基金项目(11165002)

摘　　要：MCNP中对γ谱线做高斯扩展后,能反映放射性和探测器的统计涨落等因素对谱线的影响。为了确定高斯展宽系数,通过实验获取γ能谱并计算全能峰半高宽值,利用MATLAB求解关于半高宽和射线能量的非线性方程组,得到各系数的值并带入MCNP中进行模拟。对比模拟谱与实验谱的全能峰,总计数平均相对误差为9.7%,半高宽平均相对误差为1.8%,有较好的准确性。The Gaussian expansion of Gamma spectrum in MCNP can reflect the impact of radioactivity and sta- tistical fluctuations of detector on spectrum. In order to determine its coefficient, the gamma spectrum is ob- tained through the experiment, the gamma spectrum is analysed to calculate the FWHM value of almighty peak. By solving the equations of FWHM and the energy of γ - ray through MATLAB the values of the coefficients are obtained and are taken into MCNP for simulation . By comparing the simulated gamma spectra and the experi- mental ones, the relative error of segment total number and FWHM was 9.7% and 1.8%, respectively

关 键 词：MCNP Γ能谱 高斯展宽系数 非线性方程组 

分 类 号：TL812[核科学技术—核技术及应用]