水质 - 粗β活性 - 使用厚源的测试方法

[中文适用范围]： 本文件规定了测定非盐水中总β活性浓度的测试方法。 该方法涵盖最大 β 能量约为 0.3 MeV 或更高的非挥发性放射性核素。 使用本文件中描述的测试方法对低能β发射体（例如3H、228Ra、210Pb、14C、35S和241Pu）和某些气态或挥发性放射性核素（例如氡和放射性碘）的测量可能不包括在总β定量中。 本测试方法适用于原水和饮用水的分析。 应用范围取决于水中可溶性盐总量以及所用计数器的性能特征（背景计数率和计数效率）。 实验室有责任确保该方法对于测试的水样的适用性。 [外文原描述]： This document specifies a test method for the determination of gross beta activity concentration in non-saline waters. The method covers non-volatile radionuclides with maximum beta energies of approximately 0,3 MeV or higher. Measurement of low energy beta emitters (e.g. 3 H, 228 Ra, 210 Pb, 14 C, 35 S and 241 Pu) and some gaseous or volatile radionuclides (e.g. radon and radioiodine) might not be included in the gross beta quantification using the test method described in this document. This test method is applicable to the analysis of raw and drinking waters. The range of application depends on the amount of total soluble salts in the water and on the performance characteristics (background count rate and counting efficiency) of the counter used. It is the laboratory's responsibility to ensure the suitability of this method for the water samples tested.