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采用蒙特卡罗程序(MCNP)对纳米材料WS2和MoS2在西安脉冲堆辐照实验下的位移损伤—原子离位数率进行了模拟计算与分析,确定了堆芯辐照样品内的中子注量率分布;对各样品的中子剂量率、γ剂量率进行了计算,采用典型的热中子反应堆的能谱加权,基于平均位移Kerma因子的方法,利用NJOY程序从最新的ENDF/B VII.1评价库中获取各元素的69群损伤截面,对各元素原子离位截面进行了计算,最终得到了各样品的原子离位数率。计算结果显示,纳米材料WS2和MoS2最大原子离位数率可达1.51?10-8DPA·s?1,且快中子对原子离位数率贡献要大于热中子。
The Monte Carlo (MCNP) method was used to simulate and calculate the displacement damage-atomic dislocation rate of nano-materials WS2 and MoS2 under the irradiation experiment of Xi’an Pulsed Reactor. The neutron injection The dose rate distribution of neutron was calculated. The neutron dose rate and γ dose rate of each sample were calculated. The average thermal Kerr factor was used in typical thermal neutron reactors. From the latest ENDF / B VII .1 The 69 groups of damage cross sections of each element were obtained from the evaluation library, and the atomic exit cross section of each element was calculated. Finally, the atomic number release rate of each sample was obtained. The calculated results show that the maximum atomic dislocation rate of WS2 and MoS2 can reach 1.51-10-8DPA · s-1, and the contribution of fast neutrons to atomic number ratio is larger than that of thermal neutrons.