This paper assesses radiation exposures resulting from 137Cs, 241Am, and 252Cf during well logging incidents. Based on a hypothetical rupture incident, the computer code RESRAD-OFFSITE is run for both offsite and onsite exposure locations. The absorbed doses are compared among three radioactive sources. The adverse health and environmental impact of 241Am is higher than the impact from the other two radioactive sources (137Cs and 252Cf) due to its relatively long half-life and radioactive progeny. The serious impact of 241Am will appear many years after its abandonment depending on its initial activity in the soil. For offsite, the highest maximum dose is due to 241Am (6.18 mSv y-1), which is more than 22 times the maximum doses from 137Cs and 252Cf. For onsite, the highest maximum doses are due to 241Am (121 mSv y-1), which is more than twice the maximum doses from 137Cs and 252Cf. For offsite and onsite, the dominant pathway for 137Cs is direct radiation from soil, the dominant pathway for 241Am is drinking water followed by plant ingestion, and the dominant pathway for 252Cf is direct radiation from soil. Doses from 137Cs and 252Cf are mainly impacted by the contamination on the surface. For 241Am, the opposite is true. Americium-241 doses are mainly impacted by the contamination below the surface. Based on these findings, the exposure impact for replacing an 241Am neutron source for well logging with 252Cf is assessed.

中文翻译：

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测井中 Cs-137、Am-241 和 Cf-252 的评估。

本文评估了测井事件期间 137Cs、241Am 和 252Cf 造成的辐射暴露。基于假设的破裂事件，计算机代码 RESRAD-OFFSITE 针对场外和现场暴露位置运行。比较三种放射源的吸收剂量。由于其相对较长的半衰期和放射性子体，241Am 对健康和环境的不利影响高于其他两种放射源（137Cs 和 252Cf）的影响。241Am 的严重影响将在废弃多年后显现，具体取决于其在土壤中的初始活性。对于场外，最高的最大剂量来自 241Am (6.18 mSv y-1)，它是 137Cs 和 252Cf 最大剂量的 22 倍以上。对于现场，最高的最大剂量来自 241Am (121 mSv y-1)，是 137Cs 和 252Cf 最大剂量的两倍多。对于场外和场内，137Cs 的主要途径是来自土壤的直接辐射，241Am 的主要途径是饮用水和植物摄入，252Cf 的主要途径是来自土壤的直接辐射。137Cs 和 252Cf 的剂量主要受表面污染的影响。对于 241Am，情况正好相反。镅241剂量主要受到地表以下污染的影响。根据这些发现，评估了用 252Cf 取代测井用 241Am 中子源的暴露影响。