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首页> 外文期刊>Journal of Nuclear Physics, Material Sciences, Radiation and Applications >Measurement of Content of 226Ra in Drinking Water From Some States of Mexican Republic by Liquid Scintillation Method
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Measurement of Content of 226Ra in Drinking Water From Some States of Mexican Republic by Liquid Scintillation Method

机译：液体闪烁法测定墨西哥共和国部分州饮用水中226Ra含量

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To assess the quality of drinking water in respect to the content of radioactivity, usually is carried out an screening program in the locations of interest, that program consist in pick representative samples of drinking water from the wells in that locations, water samples are analyzed to measuring the gross alpha/beta radioactivity by a low background proportional counter or a liquid scintillation system. When some sample exceeds the normative limit then it must be known which radionuclides are in that sample. Expected radionuclides in water are the NORM (normal occurring radioactive material) from the natural radioactive chains. ~(226)Ra is frequently present in drinking water and is one of most important radionuclide because its “radiotoxicity”, the WHO [World Health Organization, Guidelines for drinking-water Quality, (2016)] recommends a reference level for ~(226)Ra of 1 Bq/L (the dose coefficient for ~(226)Ra is 2.8 x 10~(-7) Sv/Bq). From a national program of drinking water screening in the Mexican Republic, the samples that exceeded the national normative limits were picked again in the same well and analyzed by LS (liquid Scintillation), using the method of two phases with a not water miscible scintillator cocktail. Results of concentrations of 226Ra from drinking water are presented. In general the content of ~(226)Ra in drinking water samples was lower that the guide values recommended for the WHO.
机译：为了评估与放射性含量相关的饮用水质量，通常在感兴趣的位置执行筛查程序，该程序包括从该位置的井中采集饮用水的代表性样品，并对水样进行分析以通过低背景比例计数器或液体闪烁系统测量总的α/β放射性。当某些样品超过标准限值时，必须知道该样品中有哪些放射性核素。水中预期的放射性核素是天然放射性链中的NORM（正常发生的放射性物质）。 〜（226）Ra经常存在于饮用水中，并且是最重要的放射性核素之一，因为它的“放射毒性”，WHO [世界卫生组织，饮用水水质准则，（2016）]建议〜（226）的参考水平Ra为1 Bq / L（〜（226）Ra的剂量系数为2.8 x 10〜（-7）Sv / Bq）。从墨西哥共和国的一项国家饮用水筛查计划中，再次在同一口井中采集超出国家标准限值的样品，并使用不与水混溶的闪烁体混合物进行两相分析，并通过LS（液体闪烁）分析。给出了饮用水中226 Ra浓度的结果。通常，饮用水样品中〜（226）Ra的含量低于WHO建议的指导值。

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