Department of Physics, University of Ibadan, UI Post Office, Ibadan, Nigeria.
Radiat Prot Dosimetry. 2020 Dec 30;192(4):421-429. doi: 10.1093/rpd/ncaa221.
Radon-222 concentrations in groundwater from 10 local government areas (LGAs) of Ogun State were measured using AlphaGUARD radon detector and AquaKIT. The mean activity concentration of radon ranged from 1.23 ± 0.21 to 12.68 ± 18.11 Bq.l-1 corresponding to geometric means (GMs) of 1.22- 6.39 Bq.l-1. The radon concentrations of all the samples were below the World Health Organization and European Commission guidance level of 100 Bq.l-1, with 17% higher than 11.1 Bq.l-1, recommended by the United States Environmental Protection Agency. Mean annual effective dose due to ingestion ranged from 0.020 ± 0.004 to 0.254 ± 0.353 mSv.y-1 (adults), 0.041 ± 0.007 to 0.509 ± 0.705 mSv.y-1 (children) and 0.024 ± 0.004 to 0.297 ± 0.411 mSv.y-1 (infants). That of inhalation varied from 0.303 ± 0.053 to 3.108 ± 4.440 μSv.y-1. The mean annual effective doses of some of the LGAs were higher than the International Commission for Radiological Protection recommended reference dose level of committed effective dose of 0.1 mSv from 1-year consumption of drinking water.
奥贡州 10 个地方政府区域（LGAs）地下水的氡-222 浓度使用 AlphaGUARD 氡探测器和 AquaKIT 进行了测量。氡的平均活度浓度范围为 1.23±0.21 至 12.68±18.11 Bq.l-1，对应的几何平均值（GMs）为 1.22-6.39 Bq.l-1。所有样本的氡浓度均低于世界卫生组织和欧洲委员会的 100 Bq.l-1 指导水平，有 17%的样本高于美国环境保护署推荐的 11.1 Bq.l-1。由于摄入导致的年平均有效剂量范围为 0.020±0.004 至 0.254±0.353 mSv.y-1（成人）、0.041±0.007 至 0.509±0.705 mSv.y-1（儿童）和 0.024±0.004 至 0.297±0.411 mSv.y-1（婴儿）。吸入的年平均有效剂量范围为 0.303±0.053 至 3.108±4.440 μSv.y-1。一些 LGA 的年平均有效剂量高于国际辐射防护委员会推荐的 1 年饮用水消费导致的有效剂量为 0.1 mSv 的参考剂量水平。
