核活化法反应计算中的蒙特卡罗模拟  

Monte Carlo simulation in the reaction rate's calculation with neutron-activation method

作　　者：鹿心鑫[1] 刘荣[1] 蒋励[1] 王玫[1] 林菊芳[1] 温中伟[1] 王大伦[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《核科学与工程》2007年第2期177-181,共5页Nuclear Science and Engineering

摘　　要：用MCNP／4B程序,对核活化法反应计算中的截断能量、通量计数方式、数据库、阈探测器之间的扰动等因素的影响作了分析。截断能量可选为有效反应阈能,不影响计算结果,但可减少计算时间。栅元通量计数方式稳定可靠,效率高,计算值略高。不同的数据库的计算结果可能有些差别。阈探测器之间的扰动对计算结果的影响很小。With MCNP/4B code, the influence of cut-off energy, flux tallies, nuclear databases and perturbation on the reaction rate＇s calculation with neutron-activation method are analysed. When the effective reaction threshold is chosen as the cut-off energy, calculation time is considerably reduced and yet the results are not changed. Comparing calculations with cell tallies （F4） with those performed with detector tallies （F5）, the counting efficiency of cell tallies is higher and the results are slightly higher, but still credible. With different nuclear databases, calculated results can be different. The perturbation among the detectors doesn＇t effect on the calculated results.

关 键 词：MCNP/4B程序 核活化法 截断能量 计数方式 核数据库 扰动 

分 类 号：TL375.5[核科学技术—核技术及应用] O411.3[理学—理论物理]