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Gross alpha/beta radioactivity and radiation dose in thermal and non-thermal spas groundwaters

机译:热温泉和非热温泉地下水中的总α/β放射性和辐射剂量

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摘要

Gross alpha and gross beta activities have been determined in thermal and non-thermal spas groundwaters (75) occurring at São Paulo and Minas Gerais states in Brazil as they are ingested in public places, bottled and used for bathing purposes, among other. The samples provided from springs and pumped tubular wells drilled at different aquifer systems inserted in Paraná and Southeastern Shield hydrogeological provinces. The WHO guideline reference value proposed in 2011 for the drinking water quality was never reached for the gross alpha activity (0.5 Bq/L) but it was exceeded in 13 groundwater samples for the gross beta activity (1 Bq/L). Available activity concentration data of the natural radionuclides 40K, 228Ra (232Th-daughter), 238U and descendants (234U, 226Ra, 222Rn, 210Pb, 210Po) allowed calculate the total Committed Effective Dose (CED) based on a drinking water ingestion rate of 2 L/day. The WHO reference level of 0.1 mSv per year for the CED was surpassed in a high number of water sources (62 (83%) or 41 (55%), disregarding radon), denoting the relevance of the radiological surveys detailing as much as possible the dissolved radionuclides present in potable waters, despite the analytical difficulties and costs involved.
机译:在巴西的圣保罗州和米纳斯吉拉斯州的温泉和非温泉温泉地下水(75)中,已经测定了总的α和总的beta活性,这些地下水是在公共场所被摄入,瓶装和用于沐浴目的等。样品取自在巴拉那州和东南盾构水文地质省份的不同含水层系统中钻出的弹簧和抽水管井。总α活性(0.5 Bq / L)从未达到2011年提出的WHO饮用水水质准则参考值,但13个地下水样品的总β活性(1 Bq / L)却未超过该参考值。天然放射性核素 40 K, 228 Ra( 232 Th子), 238 U的可用活度浓度数据和后代( 234 U, 226 Ra, 222 Rn, 210 Pb, 210 Po)允许根据2 L /天的饮用水摄入量计算总承诺有效剂量(CED)。在大量水源中(62%(83%)或41%(55%),不计ra),CED的参考水平超过了每年WHO的0.1mSv,这表明放射学调查的相关性尽可能详细尽管存在分析难度和成本,但饮用水中存在的溶解的放射性核素仍然存在。

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