MC法模拟核部件自发裂变中子活化瞬发γ能谱

Calculating Method with MC for Prompt γ Spectrums from the Nuclear Components Activated by the Neutrons

在分析中子活化瞬发γ产生机理及瞬发γ射线强度计算方法基础上,提出了应用MCNP程序计算模拟核部件自发裂变中子活化放出瞬发γ能谱的直接模拟与分步模拟方法,对两种方法的计算结果及特点进行了比较分析。计算了模拟核部件核材料自发衰变产生的γ能谱,并与瞬发γ能谱进行了比较分析。本文结果可为核部件认证技术研究提供参考。

Based on the analyses for production mechanism of the neutron activation prompt gamma and the cal- culating method of the prompt gamma intensity, we proposed two simulating methods with MCNP, the direct simulation and the stepped simulation for calculating the prompt gamma spectrums from the surrogated nuclear components activated by the spontaneous fission neutrons. The calculating results and merits and faults of the two methods were compared and analyzed. The gamma spectrums from the spontaneous decay of the surrogated nuclear components were computed, and they were compared with the prompt gamma spectrums. The results could offer references for the verification technique of the nuclear components.