本文件规定了通过液体测量所有类型水中99Tc的方法 闪烁计数（LSC）。 本方法适用于供水/饮用水、雨水、地表水和地下水的测试样品， 以及冷却水、工业用水、生活废水和工业废水，经过适当采样 处理和测试样品制备。有必要对试样进行过滤。 检测限取决于样品体积和使用的仪器。描述的方法 在本文件中，使用当前可用的LSC仪器，检测限约为 5 Bq·kg–1至20 Bq·kg–1，低于世卫组织安全饮用水标准（100 Bq l–1）[3]。对于14 ml至40 ml的样品体积，可通过30 min的计数时间获得这些值。本文所述方法不适用于超痕量99Tc的测定。交叉引用:ISO/IEC 17025ISO/IEC指南99ISO 5667-3ISO 5667-1ISO 11929ISO 80000-10ISO 5667-10ISO/IEC指南98-3ISO 19361ISO 10703ISO 3696ISO 20042ISO 5667-6ISO 5667-11ISO 5667-4ISO 11885ISO 5667-20ISO 13164-3ISO 5667-5ISO 13164- 2IEA GSG-2ISO 5667-14ISO 15586ISO 5667-7ISO 5667-9ISO 5667-8购买本文件时提供的所有当前修订版均包含在购买本文件中。

This document specifies a method for the measurement of99Tc in all types of waters by liquid scintillation counting (LSC). The method is applicable to test samples of supply/drinking water, rainwater, surface and ground water, as well as cooling water, industrial water, domestic, and industrial wastewater after proper sampling and handling, and test sample preparation. A filtration of the test sample is necessary. The detection limit depends on the sample volume and the instrument used. The method described in this document, using currently available LSC instruments, has a detection limit of approximately 5 Bq·kg–1to 20 Bq·kg–1, which is lower than the WHO criteria for safe consumption of drinking water (100 Bq l–1)[3]. These values can be achieved with a counting time of 30 min for a sample volume varying between 14 ml to 40 ml. The method presented in this document is not intended for the determination of ultra-trace amount of99Tc.Cross References:ISO/IEC 17025ISO/IEC Guide 99ISO 5667-3ISO 5667-1ISO 11929ISO 80000-10ISO 5667-10ISO/IEC Guide 98-3ISO 19361ISO 10703ISO 3696ISO 20042ISO 5667-6ISO 5667-11ISO 5667-4ISO 11885ISO 5667-20ISO 13164-3ISO 5667-5ISO 13164-2IAEA GSG-2ISO 5667-14ISO 15586ISO 5667-7ISO 5667-9ISO 5667-8All current amendments available at time of purchase are included with the purchase of this document.