Abstract

In order to reconstruct organ-absorbed dose from recorded dose for risk estimation in nuclear worker cohort, the preceding study of the International Agency for Research on Cancer (IARC) 15-Country Collaborative Study estimated the organ dose conversion factor from the recorded dose of H_p(10) under the assumption that on average, in the nuclear power plants (NPPs), 10% of the dose received by workers was due to photon energies ranging from 100 to 300 keV and 90% from photon energies ranging from 300 to 3000 keV, with the average geometry being 50% in the antero-posterior geometry and 50% in the isotropic geometry. Similar examination was conducted at the Japanese Epidemiological Study on Low-Dose Radiation Effects (J-EPISODE).Literature survey disclosed that Japanese electric power companies had jointly conducted the research on energy distribution and incidence direction distribution of gamma rays in working environments during periodical inspection and maintenance as well as during operation in the 1980s. The analysis of the survey results on photon energy and geometry distribution of Japanese NPPs demonstrated appropriateness in applying the IARC study assumption for nuclear workers in Japan and reconstructing organ-absorbed dose in the J-EPISODE. These results in Japan also provide strong evidence to support the robustness and generality of the IARC study assumption, which was estimated based on the judgment of experts at nuclear facilities around the world.

中文翻译：

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基于J篇研究文献调查的日本核电厂光子能量和方向分布估计。

摘要

为了从记录的剂量重建器官吸收的剂量以进行核工作人员队列的风险评估，国际癌症研究机构（IARC）15国合作研究的先前研究从记录的H剂量估计了器官剂量转换因子_p（10）假设平均而言，在核电厂（NPP）中，工人收到的剂量的10％是由100至300 keV的光子能量产生的，而90％是由300至3000 keV的光子能量引起的，其平均几何形状在前后几何形状中为50％，在各向同性几何形状中为50％。在日本低剂量辐射影响流行病学研究（J-EPISODE）中进行了类似的检查，文献调查显示，日本电力公司在定期检查期间联合进行了工作环境中伽马射线的能量分布和入射方向分布的研究保养和维护以及在1980年代的运营期间。对日本核电厂光子能量和几何分布调查结果的分析表明，该方法适用于将IARC研究假设应用于日本核工作者，并在J-EPISODE中重建器官吸收剂量。日本的这些结果也提供了有力的证据来支持IARC研究假设的稳健性和普遍性，该假设是根据世界各地核设施专家的判断估算得出的。