The common radionuclide 137Cs is a gamma-ray source term for nuclear reactor accidents, nuclear detonations, and potential radionuclide dispersal devices. For wide-area contamination events, one remediation option integrates water washing activities with on-site treatment of water for its immediate reuse. This remediation option includes washing building and roadways via firehose, collecting the wash water, and passing the contaminated water through chemical filtration beds. The primary objective of this study was to quantify the dose incurred to workers performing a remediation recovery effort for roadways and buildings following a wide-area release event. MicroShield® was employed to calculate the dose to workers at the roadway level and to calculate total dose rates while performing washing activities. This study finds that for a realistic contamination scenario for a wide area of a large urban environment, decontamination crews would be subjected to <220 μSv per person, much less than the 50,000 μSv limit for occupational dose. By extrapolation, one decontamination team of 48 people could continue washing operations on a total of 2.8 km2 before reaching their incurred annual dose limits. Though it is unrealistic to assign one team that entire area, we can conclude external dose will not limit worker deployment given the range of contamination levels adopted in this study.

中文翻译：

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大范围核或放射性释放事件后对恢复小组的外部剂量。

常见的放射性核素 137Cs 是一个伽马射线源术语，用于表示核反应堆事故、核爆炸和潜在的放射性核素扩散装置。对于大范围污染事件，一种补救方案将水洗活动与现场水处理相结合，以便立即再利用。该修复方案包括通过消防水带冲洗建筑物和道路、收集冲洗水以及将受污染的水通过化学过滤床。本研究的主要目的是量化大范围释放事件后对道路和建筑物进行修复恢复工作的工作人员所受到的剂量。MicroShield® 用于计算道路工人的剂量，并计算进行清洗活动时的总剂量率。这项研究发现，对于大型城市环境大范围的现实污染场景，净化人员每人受到的辐射剂量将低于 220 μSv，远低于职业剂量的 50,000 μSv 限值。据此推算，一支由 48 人组成的净化小组可以在达到年度剂量限值之前继续对总计 2.8 平方公里的区域进行清洗作业。尽管将整个区域分配给一个团队是不现实的，但考虑到本研究中采用的污染水平范围，我们可以得出结论，外部剂量不会限制工人的部署。