GB/T 13072-1991地质水样中226Ra/228Ra的活度比值分析方法.pdf

UDC 556.3:543.5:541-42 D 14 中 华 人 民 共 和 国 国 家 标 准 GB/T 13072一 91 地质水样 中226Ra/228Ra的活度 比 值 分 析 方 法 Methodformeasuringtheactivityratiosof 22Rato22Raingeologicalwatersamples 1991一07一15发布 1992一06一01实施 国 家 技 术 监 督 局 发布 目 次 主题内容与适用范围 ··························”····”································…… 二‘’二·‘’·(1) 引用标准 ····················”···················”·”·······“···“································…… (I) 方法提要 ····························一· ，’’·············································.·，.，·········… … (I) 试剂 ·······················.，···········································“····························…… (I) 仪器、设备 ········”·········。······”··...··.，·····························”·”·”························…… (z) 样品 ······“··“·································“··························”···············“·············…… (2) 分析步骤 ··············”·······价 ············”···································”················…… (3) 分析结果的表述 .····“·.·，·一· (5) 精密度 ·······························”·”····································”···················”… (7) 中华 人 民共 和 国国家标 准 地质水 样 中226Ra/22Ra的活度 比 值 分 析 方 法 GB/T 13072一91 Methodformeasuringtheactivityratiosof 2.6RatozzeRaingeologicalwatersamples 主题内容与适 用范围 1.1 主题内容 本标准规定了地质水样中zzeRa/zzeRa活度比值的分析方法.其中zF‘Ra用射气法测量，zzeRa通过其 子体”Ac在低本底声装置上测量. 1.2 适用范围 本标准适用于地表水、地下水、铀矿坑水和铀工厂废水中zzeRa和zzeRa活度比值的分析。环境污水、 海水及固体样品经过相应处理后也可参照使用。 测定范围.zzeRa比活度3.6X10-3Bq/L和zzeRa比活度3.5X10-3Bq/L以上的各种比值。 弓1用标 准 GB6379 测试方法的精密度 通过实验室间试验确定标准测试方法的重复性和再现性 3 方法提要 5L酸化过的水样中用硫酸铅、钡共沉淀富集镭，用乙二胺四乙酸二钠(EDTA二钠)溶解，过滤去不 洛杂物后重新用硫酸盐沉淀，待子体228Ac生长后用二乙三胺五乙酸(DTPA,CuHz3N30,3)溶解，再作硫酸 盐沉淀.使