ISO 13160:2021 水的质量 锶90和锶89 使用液体闪烁计数或正比计数的试验方法
标准编号：ISO 13160:2021
中文名称：水的质量 锶90和锶89 使用液体闪烁计数或正比计数的试验方法
英文名称：Water quality — Strontium 90 and strontium 89 — Test methods using liquid scintillation counting or proportional counting
发布日期：2021-07
标准范围
本文件规定了使用液体闪烁计数（LSC）或比例计数（PC）测定环境水样中90Sr和89Sr活度浓度的条件。该方法适用于饮用水、雨水、地表水和地下水、海水以及冷却水、工业用水、生活和工业废水的测试样品，经过适当的取样和处理，并进行测试样品制备。需要过滤测试样品和化学分离以从样品的测试部分分离和纯化锶。检测限取决于样品体积、使用的仪器、样品计数时间、背景计数率、检测效率和化学收率。本文档中描述的方法使用当前可用的LSC计数器，其检测限约为10？mBq l？1和2？mBq l？89Sr和90Sr分别为1，低于世卫组织安全食用标准饮用水的n（100？Bq L？1代表89Sr和10？Bq L？1代表90Sr）[3]。这些值可以在计数时间为1的情况下实现？000？样品体积为2的最小值？l.本文件中描述的方法适用于紧急情况。当核事故后发生沉降时，89Sr对放射性锶总量的贡献不可忽略。本文件提供了在89Sr存在下测定90Sr活度浓度的试验方法。吸附在悬浮物上的90Sr和89Sr的分析不在本法范围内。用户有责任确保为测试水样选择的测试方法的有效性。
This document specifies conditions for the determination of 90Sr and 89Sr activity concentration in samples of environmental water using liquid scintillation counting (LSC) or proportional counting (PC).The method is applicable to test samples of drinking water, rainwater, surface and ground water, marine water, as well as cooling water, industrial water, domestic, and industrial wastewater after proper sampling and handling, and test sample preparation. Filtration of the test sample and a chemical separation are required to separate and purify strontium from a test portion of the sample.The detection limit depends on the sample volume, the instrument used, the sample count time, the background count rate, the detection efficiency and the chemical yield. The method described in this document, using currently available LSC counters, has a detection limit of approximately 10 mBq l？1 and 2 mBq l？1 for 89Sr and 90Sr, respectively, which is lower than the WHO criteria for safe consumption of drinking water (100 Bq·l？1 for 89Sr and 10 Bq·l？1 for 90Sr)[3]. These values can be achieved with a counting time of 1 000 min for a sample volume of 2 l.The methods described in this document are applicable in the event of an emergency situation. When fallout occurs following a nuclear accident, the contribution of 89Sr to the total amount of radioactive strontium is not negligible. This document provides test methods to determine the activity concentration of 90Sr in presence of 89Sr.The analysis of 90Sr and 89Sr adsorbed to suspended matter is not covered by this method.It is the user’s responsibility to ensure the validity of this test method selected for the water samples tested.
标准预览图
