标准摘要
[中文适用范围]： 本文件规定了所有类型水样中镍-59（^59Ni）和镍-63(^63Ni)比活度的测定方法。使用目前可获得的液体闪烁检测器(LSC)，采用本方法可在200 min计数时间和1.5 L样品体积下，测量出59Ni比活度为50 mBq·l⁻¹和63Ni比活度为20 mBq·l⁻¹。注意：这些性能指标完全取决于实验室的测量方案;特别是，59Ni的检测限完全取决于水中存在的63Ni的水平。本方法的应用范围取决于水中的溶解物质量以及测量设备的性能特征（背景计数率和检测效率）。实验室应确保本测试方法适用于所测试的水样。 [外文原描述]： This document specifies the determination of nickel-59 and nickel-63 ( 59 Ni and 63 Ni) activity concentration in samples of all types of water using liquid scintillation counting (LSC). Using currently available liquid scintillation counters, this test method can measure 59 Ni activity concentrations of 50 mBq·l −1 and 63 Ni activity concentrations of 20 mBq·l −1 with a counting time of 200 min and a sample volume of 1,5 l. NOTE These performance indicators are wholly dependent on the measurement regimes in individual laboratories; in particular, the detection limits for 59 Ni are entirely dependent on the levels of 63 Ni that can be present. The range of application depends on the amount of dissolved material in the water and on the performance characteristics of the measurement equipment (background count rate and detection efficiency). It is the laboratory’s responsibility to ensure the suitability of this test method for the water samples tested.
英文名称Water quality — Nickel-59 and nickel-63 — Part 1: Test method using liquid scintillation counting