CAJ | 학술논문

利用MCNP5模拟了Cf-252中子源产生的中子在经过不同慢化材料后被慢化为热中子的过程。首先根据现有资料建立一个新的球形物理模型；其次添加各种慢化材料进行中子慢化过程模拟；最后分析各慢化材料的最佳厚度，并根据模拟结果得出最佳的慢化材料种类。此次模拟提供了一种不同的中子慢化结构及相应的慢化材料种类和厚度，为产生瞬发伽马中子活化所需的热中子源提供了一种慢化方案。
이용MCNP5모의료Cf-252중자원산생적중자재경과불동만화재료후피만화위열중자적과정。수선근거현유자료건립일개신적구형물리모형；기차첨가각충만화재료진행중자만화과정모의；최후분석각만화재료적최가후도，병근거모의결과득출최가적만화재료충류。차차모의제공료일충불동적중자만화결구급상응적만화재료충류화후도，위산생순발가마중자활화소수적열중자원제공료일충만화방안。
It simulated a process of slowing down thermal neutron through different materials of Cf -252 neutron source.A ball-type physical model is established and then we simulated the slowing down process by adding different moderation materials .The appropriate thickness of moderation materials is obtained and the optimal ma-terial types are presented.This simulation discussed a different neutron moderation structure and corresponding material types and thickness ,providing a new moderation scheme for thermal neutrons required by PGNAA .