In this study, gamma dose rates generated from the naturally occurring radioactive materials (NORM) were measured in the waste streams of a large scale and sludge onshore petroleum operations. Measurements conducted in this work involved: sludge recovery from separation tanks, sludge forming, NORM storage, scaling in oil tubulars, scaling in gas production and sedimentation in produced water evaporation ponds. Field work was carried out in many places of different terrain of an operation oil exploration and production in Murzuq basin in the Southwest of Libya. The radiation dose rates were measured using portable InSpector-1000. A total of 400 dose rates were acquired. The highest dose rate was 70 μSv/h acquired in sludge stored in barrels. The estimated mean annual equivalent doses in this field were in the range of 0.2–2.8 mSv/y in the first scenario, while in the second scenario the calculated mean annual equivalent doses were in the range of 0.04–0.68 mSv/y. It is assumed that workers may face various exposures in the field where measurements took place, considering the total annual effective dose to be 1.53 mSv/y. The main radioisotopes detected in these samples indicated by the display of the measuring device were Ra and Ra but detecting both radioisotopes in the same run is not achievable by using the display of the screen.

中文翻译：

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使用便携式 NaI 探测器评估利比亚西南部工人的职业外辐射暴露

在这项研究中，测量了大规模陆上石油作业的废物流和污泥中自然产生的放射性物质（NORM）产生的伽马剂量率。这项工作中进行的测量包括：分离罐的污泥回收、污泥形成、NORM 存储、油管结垢、天然气生产结垢以及产出水蒸发池的沉积。利比亚西南部穆尔祖克盆地石油勘探生产作业在多处不同地形进行了现场作业。使用便携式 InSpector-1000 测量辐射剂量率。总共获得了 400 个剂量率。储存在桶中的污泥中获得的最高剂量率为 70 μSv/h。在第一种情况下，该区域的估计平均年当量剂量在 0.2–2.8 mSv/y 范围内，而在第二种情况下，计算出的平均年当量剂量在 0.04–0.68 mSv/y 范围内。考虑到年有效剂量总量为 1.53 mSv/y，假设工作人员可能在测量现场面临各种暴露。测量装置的显示屏指示在这些样品中检测到的主要放射性同位素是Ra和Ra，但是通过使用屏幕显示无法实现在同一运行中检测两种放射性同位素。