5%含硼聚乙烯屏蔽快中子的实验研究与分析  

Experimental Studies and Analysis of 5% Borated Polyethylene Shielding Fast Neutron

作　　者：潘翔 林志凯[2] 潘俊峰 

机构地区：[1]北京城阳崂峰医用射线防护技术中心,北京100039 [2]中国疾病预防控制中心辐射防护与核安全医学所,北京100088

出　　处：《中国辐射卫生》2013年第4期396-397,400,共3页Chinese Journal of Radiological Health

摘　　要：目的为了解5%含硼聚乙烯(原子数%)屏蔽快中子的防护效果,用锎-252(252Cf)和镅-铍(241Am-Be)标准中子源分别对其屏蔽快中子的防护效果进行了实验研究。方法将3.2 cm厚的含硼聚乙烯板裁成直径5.5cm,厚度3.2 cm的圆形待测样品,叠加为不同的样品厚度,在国防科技工业电离辐射一级计量站用252Cf和241Am-Be标准中子源照射,分别测量不同厚度的含硼聚乙烯板对其快中子的透射率。结果结果表明,该含硼聚乙烯板厚度为3.2 cm时,对241Am-Be源中子屏蔽效率为47.7%,对252Cf源中子屏蔽效率60%,该含硼聚乙烯板厚度为12.8 cm时,对241Am-Be源中子屏蔽效率为91%,对252Cf源中子屏蔽效率95.5%,该含硼聚乙烯板厚度为22.4 cm时,对241Am-Be源中子屏蔽效率为97.9%,对252Cf源的中子屏蔽效率98.2%。结论该含硼聚乙烯板是一种高效的防中子屏蔽材料,可有效用于中子和中子、γ混合辐射场中的中子辐射屏蔽防护。Objective In order to acquaint the protective effects of 5% （ atomic number% ） borated polyethylene shielding fast neutron, Experimental studies of protective effects were carried out respectively using californium - 252 （^ 252 Cf） and americium - beryllium（ ^241 Am - Be ） standard neutron sources for its protective effects against fast neutron. Methods To cut the 5% borated polyethylene of thickness 3.2 cm into the circular samples of diameter 5.5 cm thickness 3.2 cm, then to overlay them into samples of different thickness, after that to determine the fast neutron transmission rate of the different thick-ness borated polyethylene plates irradiated by ^252Cf and 241 Am -Be standard neutron sources in Primary Metrology Station of In-dustry for National Defense Science and Technology. Results The results show that the neutron shielding effects are 47.7% and 60% respectively for 241 Am - Be and ^252Cf neutron sources when thickness of The borated polyethylene plate is 3.2 cm; The neutron shielding effects are 91% and 95.5 % respectively for ^241 Am - Be and ^252 Cf neutron sources when thickness of the borated polyethylene plate is 12.8 cm; The neutron shielding effects are 97.9% and 98.2% respectively for ^241 Am - Be and ^252 Cf neutron sources when thickness of the borated polyethylene plate is 22.4 cm. Conclusion The borated polyethylene plate is a kind of high effective shielding material against neutrons. It can be effectively used for neutron radiation shielding protection in neutron or neutron and mixed radiation fields.

关 键 词：含硼聚乙烯 屏蔽性能 中子 

分 类 号：R142.2[医药卫生—公共卫生与预防医学]