Radiological impact of radon in air is a global issue whereas radon in water has local consequences. Considering its importance, we have conducted a study on radon activity measurements in 316 tube-well water samples collected from Susunia hill area in Bankura district of West Bengal, India during the period of 25th December 2018–2nd February 2020. Radon contents are measured using AlphaGUARD radon monitor. The obtained radon activities in drinking water samples lie between 1.78 ± 0.07 and 3213.50 ± 77.32 Bq/l with an average of 128.30 ± 14.09 Bq/l. This study reveals that 93% of the samples have radon levels in excess of the USEPA proposed maximum contamination level (MCL) of 11.1 Bq/l while radon levels of 40% samples have exceeded the WHO and EU Council Directive recommended reference level of 100 Bq/l. The total annual effective dose of the samples have been estimated by considering the per day water intake of 3 l. The calculated total annual effective dose widely fluctuates between 10.39 and 18649.55 μSv/year with an average value of 744.59 μSv/year. 269 water samples have exceeded the WHO and EU Council Directive recommended reference level of 100 μSv/year. However, if we consider the UNSCEAR prescribed annual water intake of 60 l, the average dose becomes 279.82 μSv/year. The situation demands attention of the local authorities. Local people are advised to take some easy preventive measures for their radiological protection against such contamination.

空气中氡的辐射影响是一个全球性问题，而水中氡具有局部后果。考虑到其重要性，我们对 2018 年 12 月 25 日至 2020 年 2 月 2 日期间从印度西孟加拉邦班古拉区的 Susunia 山地区采集的 316 个管井水样进行了氡活度测量研究。氡含量使用AlphaGUARD 氡气监测器。在饮用水样品中获得的氡活度介于 1.78 ± 0.07 和 3213.50 ± 77.32 Bq/l 之间，平均值为 128.30 ± 14.09 Bq/l。这项研究表明，93% 的样品的氡含量超过了 USEPA 建议的最大污染水平 (MCL) 11.1 Bq/l，而 40% 的样品的氡含量超过了 WHO 和欧盟理事会指令推荐的 100 Bq 参考水平/升。样本的年总有效剂量是通过考虑每天 3 升的饮水量来估算的。计算得到的年总有效剂量在 10.39 和 18649.55 μSv/年之间波动较大，平均值为 744.59 μSv/年。269 个水样超过了世界卫生组织和欧盟理事会指令推荐的 100 μSv/年的参考水平。然而，如果我们考虑 UNSCEAR 规定的 60 升水的年摄入量，则平均剂量变为 279.82 μSv/年。这种情况需要地方当局注意。建议当地人采取一些简单的预防措施，以防止此类污染的辐射防护。55 μSv/年，平均值为 744.59 μSv/年。269 个水样超过了世界卫生组织和欧盟理事会指令推荐的 100 μSv/年的参考水平。然而，如果我们考虑 UNSCEAR 规定的 60 升水的年摄入量，则平均剂量变为 279.82 μSv/年。这种情况需要地方当局注意。建议当地人采取一些简单的预防措施，以防止此类污染的辐射防护。55 μSv/年，平均值为 744.59 μSv/年。269 个水样超过了世界卫生组织和欧盟理事会指令推荐的 100 μSv/年的参考水平。然而，如果我们考虑 UNSCEAR 规定的 60 升水的年摄入量，则平均剂量变为 279.82 μSv/年。这种情况需要地方当局注意。建议当地人采取一些简单的预防措施，以防止此类污染的辐射防护。