The present study attempts to generate the first baseline data on gross α and β activities in groundwater and riverine water samples collected from different regions of Indian Sundarbans, a part of the world's largest mangrove ecosystem. Until the present, no information is available related to radioactivity measurement in water samples from this vast area. Gross alpha-beta activities were measured by liquid scintillation counting-triple to double coincidence ratio (LSC-TDCR) technique. The minimum detectable activities in present experimental condition were found to be 21 mBq L-1 and 55 mBq L-1 for gross α and β respectively. Gross alpha activities in all groundwater and riverine samples were found to be below the detection limit (BDL), whereas gross beta activities in groundwater and riverine samples varied from BDL to 0.46 ± 0.24 Bq L-1 and BDL to 0.90 ± 0.26 Bq L-1 respectively, which are below WHO recommended value 1 Bq L-1. Annual effective doses were below 0.1 mSv. U and Th concentrations in the water samples were determined by ultrasonic-nebulizer assisted Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) and found to be BDL. For assessing 3H activity, double-distilled water samples were measured by LSC-TDCR technique, which provided BDL result.

中文翻译：

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从印度Sundarbans收集的地下水和河流水样品的放射源质量评估。

本研究试图生成关于从印度桑达班地区（世界上最大的红树林生态系统的一部分）不同地区收集的地下水和河水样品中的总α和β活性的第一个基准数据。到目前为止，尚无与该广阔地区的水样中放射性测量相关的信息。通过液体闪烁计数三重对偶符合率（LSC-TDCR）技术测量总的α-β活性。在目前的实验条件下，总α和β的最低可检测活性分别为21 mBq L-1和55 mBq L-1。发现所有地下水和河流样品中的总α活度均低于检出限（BDL），而地下水和河流样品中的总β活度从BDL到0.46±0不等。24 Bq L-1和BDL分别为0.90±0.26 Bq L-1，低于WHO推荐值1 Bq L-1。年有效剂量低于0.1 mSv。通过超声雾化器辅助的电感耦合等离子体发射光谱法（ICP-OES）测定水样品中的U和Th浓度，发现其为BDL。为了评估3H活性，通过LSC-TDCR技术测量了双蒸馏水样品，该结果提供了BDL结果。