本文件描述了测量土壤样品中90Sr与90Y和89Sr（纯β放射性核素）平衡活度的原理。提出了不同的化学分离方法来产生锶源和钇源，其活性由比例计数器（PC）或液体闪烁计数器（LSC）测定。当达到90Sr和90Y之间的平衡或通过直接测量90Sr时，可从试样中获得90Sr。测量方法的选择取决于污染物的来源、待分析土壤的特性、所需的测量精度和可用实验室的资源。 交叉引用:ISO 18589-2ISO/IEC 17025ISO/IEC指南98-3ISO 11074ISO 80000-10ISO 11929（所有部分）ISO 19361NUREG-1576购买本文件时提供的所有现行修订版均包含在购买本文件中。

This document describes the principles for the measurement of the activity of90Sr in equilibrium with90Y and89Sr, pure beta emitting radionuclides, in soil samples. Different chemical separation methods are presented to produce strontium and yttrium sources, the activity of which is determined using proportional counters (PC) or liquid scintillation counters (LSC).90Sr can be obtained from the test samples when the equilibrium between90Sr and90Y is reached or through direct90Y measurement. The selection of the measuring method depends on the origin of the contamination, the characteristics of the soil to be analysed, the required accuracy of measurement and the resources of the available laboratories.Cross References:ISO 18589-2ISO/IEC 17025ISO/IEC Guide 98-3ISO 11074ISO 80000-10ISO 11929 (all parts)ISO 19361NUREG-1576All current amendments available at time of purchase are included with the purchase of this document.