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因热中子与物质作用的俘获截面比快中子大,故一般都用热中子。在应用中需把快中子慢化成热中子。选取合理的慢化体结构、最有效的提高热中子注量率是一项十分重要的工作。对慢化材料的要求是:它对快中子有较好的慢化性能,而对热中子的吸收则较少。中子慢化主要是通过中子与慢化体内原子核的弹性和非弹性碰撞来实现。热中子一般是利用中
Due to thermal neutron and material capture section than neutron fast, it is generally used thermal neutrons. In applications need to slow neutrons into thermal neutrons. Selecting a reasonable moderator structure, the most effective way to improve the thermal neutron fluence is a very important task. The requirement for moderated material is that it has good moderating properties for fast neutrons and less for thermal neutrons. Neutron moderation is mainly achieved through the elastic and inelastic collision of neutrons and modest nuclei in the body. Thermal neutrons are generally used