1.1 本试验方法包括可溶性、悬浮和总悬浮物的测量 226 浓度高于3.7的水中的Ra × 10 −3. Bq/L。本试验方法不适用于其他镭同位素的测量。 1.2 该试验方法可用于通过使用 226 Ra标准，或通过相互比较测量值进行相对测量。 1.3 该测试方法不符合当前的实践要求 D2777 . 1.4 以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 1.5 氢氟酸（HF）非常危险，应在通风良好的软篷中使用。戴橡胶手套、安全眼镜或护目镜，穿实验室工作服。避免吸入任何HF烟雾。使用HF后，立即清理所有溢出物并彻底清洗。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 地下水中最普遍的五种镭同位素的半衰期大于一天，是 226 Ra和 228 Ra。与其他同等浓度的天然核素相比，如果通过水途径摄入，这两种同位素也存在最大的健康风险。 5.2 虽然主要用于水介质，但该技术可能适用于测量 226 介质完全分解并放入水溶液后，任何介质的Ra含量。 5.3 该测试方法基于Rushing等人先前发布的方法。 ( 1. ) . 3. 该技术的一般方法和基础与Ref类似 ( 2. ) .

1.1 This test method covers the measurement of soluble, suspended, and total 226 Ra in water in concentrations above 3.7 × 10 −3 Bq/L. This test method is not applicable to the measurement of other radium isotopes. 1.2 This test method may be used for quantitative measurements by calibrating with a 226 Ra standard, or for relative measurements by comparing the measurements made with each other. 1.3 This test method does not meet the current requirements of Practice D2777 . 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.5 Hydrofluoric acid (HF) is very hazardous and should be used in a well-ventilated hood. Wear rubber gloves, safety glasses or goggles, and a laboratory coat. Avoid breathing any HF fumes. Clean up all spills promptly and wash thoroughly after using HF. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The most prevalent of the five radium isotopes in ground water, having a half life greater than one day, are 226 Ra and 228 Ra. These two isotopes also present the greatest health risk compared to the other naturally occurring nuclides of equal concentrations if ingested via the water pathway. 5.2 Although primarily utilized on a water medium, this technique may be applicable for the measurement of the 226 Ra content of any medium once the medium has been completely decomposed and put into an aqueous solution. 5.3 This test method is based on a method previously published by Rushing, et al. ( 1 ) . 3 The general methodology and basis of the technique are similar to that of Ref ( 2 ) .