普通混凝土中掺入CRTs后的屏蔽性能研究  

On the γ-ray shielding performance of the ordinary concrete added by CRTs

作　　者：程鹏亮[1] 葛良全[1] 张庆贤[1] 李秋实[1] 

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

出　　处：《安全与环境学报》2016年第1期230-234,共5页Journal of Safety and Environment

基　　金：863重大项目(2012AA061803);国家自然科学基金项目(41374136)

摘　　要：研究了普通混凝土中掺入不同比例的报废彩色阴极X射线管(CRTs)瓶锥部分对不同能量(0.662 Me V、1 Me V、2 Me V、3 Me V)γ射线的屏蔽性能。采用蒙特卡罗方法,基于MCNP5程序对普通混凝土(NBS)、CRTs、各种比例配置混凝土的屏蔽性能进行模拟分析,得到4种射线穿过不同屏蔽体的透射光谱、线衰减系数及透射率。结果表明,对于同一种能量的γ射线,随CRTs瓶锥部分增加,相同厚度的屏蔽体屏蔽性能逐渐增强,并且计算出了4种能量的γ射线在5种屏蔽体中的线衰减系数,同时得出了4种γ射线在屏蔽体中的半吸收厚度和10倍衰减厚度,其中3 Me V的γ射线衰减10倍时,在CRTs、O、T、N中所需要的厚度分别是在NBS中所需要厚度的79%、88%、83%、80%。In the present study, we are going to investigate the shielding performance of different energy T-rays in the ordinary con- crete added with different ratios of a mixture made of scrap color cath- ode X-ray tube bottles of cone parts. For the research purpose, we have adopted the procedure of MCNP5 with the Monte Carlo method and made a simulation of the shielding performance of the four kinds of energy T-rays in different ratios of concrete constituents to the ordi- nary concrete and CRTs. As a result, we have built up the transmis- sion spectrum, the linear attenuation coefficient and the transmissivity of different energy T-rays through different shields. The simulation re- suits show that the shielding performance of the concrete with the same thickness can be gradually improved with the increase of the proportion of CRTs for the same energy T-rays. At the same time, we have calculated the linear attenuation coefficients of 7 rays with dif- ferent kinds of energy in the five shields （NBS, CRTs, O, T, and N）, whose coefficients of T ray with energy 0.662 MeV have been worked out equal to 0. 176 7 cm- 1, 0.227 4 cm- 1, 0.201 7 cm- 1, 0.214 6 cm-l and 0.222 3 cm-1 respectively. And, the coefficients of the T ray with energy of 1 MeV turn to be 0. 144 5 cm- l, 0. 183 5 cm-1, 0.164 0 cm-l, 0.173 6 cm-1 and 0.179 7 cm-1, whereas for the 7 ray with energy 2 MeV, the coefficients tend to be 0.099 4 cm-1, 0.126 3 cm-1, 0.113 0 cm-1 , 0.119 5 cm-1 and 0.222 3 cm- 1, correspondingly. And, in contrast, the coefficients in the five shields for the V ray with energy of 3 MeV have been found equal to 0.080 5 cm-1, 0.1024 cm-1, 0.091 6 cm-1, 0.090 9 cm-1 and 0. 100 2 cm- 1, respectively. At the same time, we have also gained the half-absorption thickness and decade-fold attenuation thickness of the four energy T-rays in the five different shielding materials. Among them, for the attenuation of 10 times of T-ray energy of 3 MeV, the thickness needed in CRTs, O, T and N has to be 79%, 88%, 83% and 80 % as much as that in t

关 键 词：环境科学技术其他学科 MCNP5 报废彩色阴极X射线管 屏蔽性能 Γ射线 

分 类 号：X799[环境科学与工程—环境工程] TL941.19[核科学技术—辐射防护及环境保护]