摘要
主要关于上海同步辐射装置(SSRF)储存环电子引发产生的韧致辐射和中子辐射的研究.中子和光子经多种组合材料(厚度在5cm～115cm之间)屏蔽后的剂量特征由蒙特卡罗代码MCNP和EGSnrc估算得到;蒙特卡罗计算表明,单一的材料如铅,铁和聚乙烯对高能中子是无效的生物屏蔽材料,而组合材料如铅或者铁加聚乙烯和铅或者铁加混凝土被认为是屏蔽高能中子很好的组合材料.铅铁等高Z材料加点包含有氩的低Z材料如聚乙烯是同时屏蔽高能中子和韧致辐射的一种比较好的组合材料选择.
This study investigated the characteristics of bremsstrahlung and induced neutrons from the elec- tron storage ring in the Shanghai Synchrotron Radiation Facility (SSRF).The EGSnrc and MCNP Monte Carlo code has been used to perform the assess neutron and photon dose profiles for a variety of shield ma- terials ranging from 5 to 115cm thick.The Monte Carlo simulations show that single material such as lead, iron and polyethylene have been found to be ineffective biological shield materials,while the mixed materials serve as effective shields for shielding high energy neutron.Mixed materials such as lead or iron combined with polyethylene or with concrete are good materials combination for high energy neutron radiation shield.And high-Z materials such as lead or iron combine with low-Z material containing some hydrogen such polyethylene are effective for shielding high energy neutrons as well as bremsstrahlung.
