电子辐照加速器屏蔽墙中预埋管道倾角对辐射防护性能影响的蒙特卡罗计算

发布时间：2018-01-15 19:43

本文关键词：电子辐照加速器屏蔽墙中预埋管道倾角对辐射防护性能影响的蒙特卡罗计算　出处：《辐射防护》2017年01期 　论文类型：期刊论文

【摘要】：电子辐照装置屏蔽墙中总存在一些较大口径的管道如辐照电缆传输孔道,这些管道的存在势必会降低屏蔽体的局部屏蔽能力。为定量评估管道对屏蔽效果的影响,本文以3 Me V电子辐照加速器为例,采用蒙特卡罗MCNP程序分别模拟计算了电子打靶以后产生的能谱中1 Me V以下和1 Me V以上不同单能光子入射同一屏蔽体时,管道以不同角度穿透屏蔽墙时管道出口处及屏蔽墙外辐射场分布;并比较了在不同墙厚下这两个能段对管道出口处辐射场的影响程度。计算结果表明:不同单能光子入射屏蔽体,在管道穿墙角度≥45°时,管道出口处辐射场变化不再明显,对于1 Me V以下的低能光子在墙外的透射辐射场基本可忽略,对于1 Me V以上的能量光子,其墙外光子透射辐射场随角度增大影响显著;随着墙厚增加,低能光子衰减越显著,高能光子在管道穿墙夹角设计中越占据了主导地位。
[Abstract]:Some of the larger diameter pipes such as irradiation cable transmission channel exists in the electron irradiation device shielding wall, the presence of the pipeline is bound to reduce the local shielding ability of shielding. For quantitative evaluation of the effects of the shielding effect of the pipeline, taking 3 Me V electron irradiation accelerator as an example, using Monte Carlo simulation program MCNP respectively after the electronic target the calculation of energy spectrum in 1 Me V and 1 Me V under different single photon incident with a shield, pipe at different angles through the shield wall pipe outlet and shielding wall radiation field distribution; and compared the different wall thickness in the two section of the pipeline at the outlet of the radiation energy the degree of influence. The calculation results show that the different single photon incident shield in the pipeline wall angle greater than 45 degrees, the pipeline at the outlet of the radiation field changes are not obvious, for the 1 Me below V low energy photon on the outside of the wall The transmission radiation field is basically negligible. For the energy photon above 1 Me V, the photon transmission radiation field outside the wall has a significant effect with the increase of the angle. With the increase of wall thickness, the attenuation of the low energy photon is more significant, and the high-energy photon occupies a leading position in the design of the pipeline through the wall corner.

【作者单位】：中国科学技术大学核科学技术学院;
【基金】：国家自然科学基金资助项目(NSFC11375182) 安徽省科技攻关计划项目(1401042001)
【分类号】：R142
【正文快照】： 近年来加速器技术发展迅速,其应用范围不断拓宽,覆盖了肿瘤治疗、放射性同位素药品制备、材料辐照交联、消毒灭菌等生产生活的各个方面。辐照加工产业的快速发展推动了作为辐射加工主要设备的工业电子加速器的快速发展。随着工业加速器应用的发展,工业电子加速器屏蔽设计的重

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