警告-使用ISO 13165本部分的人员应熟悉普通实验室 实践ISO 13165的本部分并不旨在解决所有安全问题（如有）， 与它的使用有关。用户有责任建立适当的安全和安保措施 并确保符合任何国家监管条件。 重要事项——按照本部分进行测试是绝对必要的 ISO 13165应由合格的员工执行。ISO 13165的本部分规定了用共沉淀法和伽马法测定所有类型水中的镭-226（226Ra）活度浓度- 光谱法（见ISO 18589-3）。 所述方法适用于使用1 l至100 l任何水类型的样品体积测定大于0,02 Bq l–1的可溶性226RA活性浓度。 对于体积小于1 l的水样，可按照以下步骤进行直接伽马光谱测定: ISO 10703具有更高的检测限。交叉引用:ISO 5667-3ISO 80000-10IEC 17025ISO 11929ISO 10703IEC指南98-3ISO 369619:2010GUM:1995ISO 11665-1EAL-G12:1995ISO 18589-3ISO 11665-5ISO 5667-1ISO 921:1997ISO 31-9ISO 6107-2ISO/IEC指南98-3:2008包含以下内容:勘误表，2020年3月

WARNING — Persons using this part of ISO 13165 should be familiar with normal laboratory practice. This part of ISO 13165 does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. IMPORTANT — It is absolutely essential that tests conducted in accordance with this part of ISO 13165 be carried out by suitably qualified staff.This part of ISO 13165 specifies the determination of radium-226 (226Ra) activity concentration in all types of water by coprecipitation followed by gamma-spectrometry (see ISO 18589-3). The method described is suitable for determination of soluble226Ra activity concentrations greater than 0,02 Bq l–1using a sample volume of 1 l to 100 l of any water type. For water samples smaller than a volume of 1 l, direct gamma-spectrometry can be performed following ISO 10703 with a higher detection limit.Cross References:ISO 5667-3ISO 80000-10IEC 17025ISO 11929ISO 10703IEC Guide 98-3ISO 369619:2010GUM:1995ISO 11665-1EAL-G12:1995ISO 18589-3ISO 11665-5ISO 5667-1ISO 921:1997ISO 31-9ISO 6107-2ISO/IEC Guide 98-3:2008Incorporates the following:Corrigendum, March 2020