摘要
运用MC法模拟14 MeV快中子进入沉积物后的物理过程,得到了不同深度下沉积物中子能谱分布,分析了0~1 eV中子在沉积物中横、纵向分布规律以及含水率与Cl^-浓度对中子分布的影响,探讨了模拟条件下0~1 eV中子扩散的最大深度范围。结果表明:沉积物含水率对中子能谱分布和0~1 eV中子横、纵向分布均有显著影响,进行中子活化的最佳深度为2 cm处;0~1 eV中子扩散的最大深度范围为20~40 cm;海水中Cl^-浓度对中子吸收有影响但影响不显著。
Monte Carlo method was used to simulate the physical process of 14 MeV fast neutrons after entering the sediments. The work obtained the neutron spectrums in different depths and the distribution of 0 ～ 1 eV neutrons in sediments, the influence of water contents and concentration of Cl^- on the distribution was analyzed and the range of maximum depth of 0～ 1 eV neutrons diffusion was discussed. The results show that water content has a significant influence on neutron energy spectrums, and the transverse and longitudinal distribution of 0 ～ 1 eV neutrons can also be affected. The optimum depth of neutron activation is 2 cm and the range of maximum depth of 0 ～ 1 eV neutrons diffusion is 20 cm ～ 40 cm. The concentration of Cl-in sea water has influence on neutron absorption, but the influence is not significant.
出处
《核电子学与探测技术》
北大核心
2017年第4期435-440,共6页
Nuclear Electronics & Detection Technology
基金
国家自然科学基金(41374136)
四川省科技支撑计划项目(2015RZ0010)资助
关键词
PGNAA
原位测量
海底沉积物
MC模拟
中子分布
PGNAA
in - situ measurement
submarine sediment
Monte Carlo simulation
neutron distribution
