Naturally occurring radon-222 was evaluated for its use in estimating annual effective dose exposure in groundwater samples of the southeast coastal area of Bangladesh. On-site radon concentration was measured in groundwater using AlphaGUARD PQ2000 PRO (Saphymo, Germany) radon monitor. The measured values range 0.36–15.70 Bq per l, which lies within the safe limit of 4–40 Bq per l recommended by UNSCEAR. On the contrary, few samples show radon concentration above the safe limit of 11.1 Bq per l recommended by USEPA. The mean annual effective doses due to ingestion and inhalation resulting from radon in groundwater vary from 0.99 to 42.87 μSv per y with an average value of 12.45 μSv per y, which is far below the safe limit 100 μSv per y recommended by WHO and EU. Results reveal that there is no significant public health hazard due to radon ingestion and inhalation from groundwater in the study area.

中文翻译：

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孟加拉国东南沿海地区因吸入和摄入地下水中的氡而导致的年有效剂量评估

评估了天然存在的氡 222 用于估算孟加拉国东南沿海地区地下水样品的年有效剂量暴露。使用 AlphaGUARD PQ2000 PRO (Saphymo, Germany) 氡监测仪在地下水中测量现场氡浓度。测量值范围为 0.36–15.70 Bq/l，处于 UNSCEAR 推荐的 4–40 Bq/l 的安全限度内。相反，很少有样品显示氡浓度高于 USEPA 推荐的每升 11.1 Bq 的安全限值。地下水中氡摄入和吸入造成的年平均有效剂量为 0.99 至 42.87 μSv/y，平均值为 12.45 μSv/y，远低于 WHO 和 EU 推荐的 100 μSv/y 安全限值。