MC法优化设计^(252)Cf中子源辐射屏蔽装置  

The Optimization of Radiation Shielding Device for ^(252)Cf Based on Monte Carlo

作　　者：马桥[1,2] 刘明哲[1] 刘德明[2] 刘冉[2] 

机构地区：[1]成都理工大学地学核技术四川省重点实验室,成都610059 [2]四川省疾病预防控制中心,成都610041

出　　处：《核电子学与探测技术》2016年第8期791-794,共4页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(41274109)资助

摘　　要：利用MCNP5程序构建了屏蔽装置模型,并模拟了聚乙烯、含质量分数10%硼的石蜡、重水、石墨和铅等材料的中子慢化和屏蔽效果,以及铁对γ射线的屏蔽效果。当中子慢化剂聚乙烯的厚度达5 cm时,透过慢化层发射出的中子注量率达到最大值为5.40×10-4m^(-2)s^(-1)。中子屏蔽层含硼石蜡厚度为33 cm并且γ屏蔽层铁厚度为4 cm时,由中子和γ射线产生的年有效剂量之和满足国家标准相关限值要求。Using the MCNP5 simulate polyethylene, containing 10% （mass fraction） boron paraffin, heavy water and graphite, getting the neutron moderating and shielding effect of materials, and γray shielding effect of iron. When the thickness of polyethylene is up to 5 cm, the neutron fluence rate from the slow layer reached the -1 maximum of 5.40 × 10^-4 m^-2 s^-1 . When the thickness of boron containing paraffin is up to 33 cm and the thickness of iron is 4 cm, the annual dose of neutron and γ ray meets the standards requirements.

关 键 词：MCNP5 42Cf中子源 慢化剂 辐射防护 

分 类 号：TL99[核科学技术—核技术及应用]