Isam Salih M M, Pettersson H B L, Lund E
Department of Radiation Physics, IMV, Faculty of Health Sciences, Linköping University, Sweden.
Radiat Prot Dosimetry. 2002;102(3):249-58. doi: 10.1093/oxfordjournals.rpd.a006093.
Natural radioactivity in drinking water from 328 drilled wells was studied in correlation to source parameters. Poor correlation to both aquifer geology and bedrock radioactivity was observed. Concentrations of 238U, 226Ra, 228Ra, 222Rn and 210Po in groundwater samples was in the ranges <0.027-5.3, <0.016-4.9, <0.014-1.24, 5-8105 and <0.05-0.947 Bq.l(-1) respectively. In about 80% of the sites the radon concentration exceeds the Nordic recommended exemption level for radon in drinking water and 15% of the sites exceed the action limit. The effective doses from ingestion were calculated and presented in association with geology. Doses due to ingestion ranged between 0.05 and 20.4 mSv.y(-1), where the average contribution from 222Rn amounted to 75%. In comparison, the effective doses from inhalation of indoor 222Rn ranged between 0.2 and 20 mSv.y(-1). The average contribution from inhalation of 222Rn in air to the total effective dose (ingestion+inhalation) was 58 +/- 22%, 73 +/- 18% and 77 +/- 16% (1 SD) for the age categories 1 y, 10 y and adults respectively.
对328口钻井饮用水中的天然放射性与水源参数的相关性进行了研究。研究发现，其与含水层地质和基岩放射性的相关性均较差。地下水样本中238U、226Ra、228Ra、222Rn和210Po的浓度范围分别为<0.027 - 5.3、<0.016 - 4.9、<0.014 - 1.24、5 - 8105和<0.05 - 0.947 Bq·l⁻¹。在约80%的采样点，氡浓度超过了北欧推荐的饮用水中氡的豁免水平，15%的采样点超过了行动限值。计算了摄入所致的有效剂量，并结合地质情况进行了呈现。摄入所致剂量范围在0.05至20.4 mSv·y⁻¹之间，其中222Rn的平均贡献量达75%。相比之下，室内吸入222Rn所致的有效剂量范围在0.2至20 mSv·y⁻¹之间。对于1岁、10岁和成年人年龄组，空气中吸入222Rn对总有效剂量（摄入 + 吸入）的平均贡献分别为58 ± 22%、73 ± 18%和77 ± 16%（1个标准差）。
