Dose assessment and shielding analysis of the working environments for non-destructive testing
Dose assessment and shielding analysis of the working environments for non-destructive testing
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DOI：
10.1088/1748-0221/15/06/p06012
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发表时间：
2020-06-01
影响因子：
1.3
通讯作者：
Kim, J. H.
中科院分区：
文献类型：
--
作者：
Cho, Y., I;Shin, S. H.;Kim, J. H.
由于使用高水平辐射源，非破坏性辐射测试（NDT）领域的工作人员暴露于所有辐射相关领域的最高暴露剂量。因此，在这项研究中，辐射剂量进行了评估，通过模拟NDT的工作环境，使用蒙特卡罗方法，并进行屏蔽分析，以设计一个有效的屏蔽设施。通过分析无损检测中使用的辐射源（Ir-192、Co-60、Se-75），并评估工作环境中的当前辐射剂量，发现Co-60的剂量分布约为Ir-192的2.4倍，Ir-192的剂量分布约为Se-75的2.2倍。随着距离的增加，照射剂量按距离平方反比规律逐渐减小。相反，观察到天空照射效应，即在距离辐射源2-6米的高度和1米的距离内，照射量增加。此外，屏蔽分析的结果显示，铅具有最高的屏蔽效果。其他屏蔽材料表现出与有效原子序数和密度成比例的高屏蔽效率，在混凝土的情况下，屏蔽效率与铁和金属含量成比例。本研究结果可应用于各种防护设施的设计。
Due to their use of high-level radiation sources, workers in the field of non-destructive radiation testing (NDT) are exposed to the highest exposure dose of all radiation-related fields. Hence, in this study, radiation doses were evaluated by simulating the NDT working environment using the Monte Carlo method, and a shielding analysis was conducted in order to design an efficient shielding facility. By analyzing the radiation source (Ir-192, Co-60, Se-75) used in NDT and evaluating the present radiation dose in the working environment, it was found that the dose distribution was approximately 2.4 times higher for Co-60 than Ir-192 and 2.2 times higher for Ir-192 than Se-75. Moreover, as the distance increased, the exposure dose gradually decreased according to the distance inverse square law. Conversely, a skyshine effect was observed whereby exposure increased at a height of 2-6 m from the radiation source and within a distance of 1 m. Furthermore, results of the shielding analysis revealed that lead had the highest shielding effect. Other shielding materials exhibited a high shielding efficiency in proportion to the effective atomic number and density and, in the case of concrete, the shielding efficiency was proportional to the iron and metal content. The results of this study could be implemented in the design of various shielding facilities for NDT workers.