China Institute of Atomic Energy, Beijing, 102413, China.
Sci Rep. 2022 May 18;12(1):8281. doi: 10.1038/s41598-022-12245-x.
Based on the standards of ISO11704-2018 and ASTM D7283-17, a method for simultaneous determination of gross alpha and gross beta activity concentrations in water by liquid scintillation counting (LSC) was established, which can be applied to various types of water samples in routine monitoring, such as drinking water, groundwater, geothermal water, seawater, and radioactive wastewater. The sample's pH value and concentrated volume must be controlled to avoid quenching as much as possible. The validation tests show that the deviations of gross alpha and gross beta activities can satisfy quality control requirements in a wide range of activity ratios from 1:102 to 67:1. For the actual samples, the measurement results of the LSC method are in good agreement with those of the thick source method, in which the relative deviations of gross alpha and gross beta are both less than 15% for these two methods. Moreover, the LSC method performs better in detection limit and has a simpler pretreatment process than the thick source method.
基于 ISO11704-2018 和 ASTM D7283-17 标准，建立了液闪计数法（LSC）同时测定水中总α和总β活度浓度的方法，可应用于常规监测中的各种类型水样，如饮用水、地下水、地热水、海水和放射性废水。必须控制样品的 pH 值和浓缩体积，以尽量避免淬灭。验证试验表明，总α和总β活度的偏差在 1:102 到 67:1 的宽活度比范围内都能满足质量控制要求。对于实际样品，LSC 法的测量结果与厚源法的测量结果吻合良好，两种方法的总α和总β相对偏差均小于 15%。此外，LSC 法的检测限优于厚源法，且预处理过程更为简单。
