1.1 本试验方法涵盖根据计数时间、样本量、检测器、背景和示踪剂产量在检测水平上测定土壤中的钚。本试验方法描述了测定土壤中钚的一种可接受方法。 1.2 本试验方法设计用于10 g土壤，之前按照实践中所述收集和处理 C998 和 C999 ，但可通过该试验方法分析50 g以下的样品。本试验方法可能无法完全溶解土壤基质中所有形式的钚。 1.3 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考。 1.4 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。 第节给出了具体的预防说明 10 . 1.5 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 土壤采样和分析程序提供了确定土壤中放射性核素浓度和分布的直接方法。 土壤分析程序对于运行前监测程序在核设施运行前建立基线浓度具有最重要的意义。土壤分析虽然在涉及意外释放的特殊情况下很有用，但对于评估小增量释放来说是一种较差的技术，因此不建议将其作为常规监测放射性物质释放的方法。然而，由于土壤是长寿命放射性核素的集成商和储库，并且是对人类具有潜在重要性的几种钚途径中的中介，因此了解土壤中钚的浓度至关重要。

1.1 This test method covers the determination of plutonium in soils at levels of detection dependent on count time, sample size, detector, background, and tracer yield. This test method describes one acceptable approach to the determination of plutonium in soil. 1.2 This test method is designed for 10 g of soil, previously collected and treated as described in Practices C998 and C999 , but sample sizes up to 50 g may be analyzed by this test method. This test method may not be able to completely dissolve all forms of plutonium in the soil matrix. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.4 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. Specific precautionary statements are given in Section 10 . 1.5 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 A soil sampling and analysis program provides a direct means of determining the concentration and distribution of radionuclides in soil. A soil analysis program has the most significance for the preoperational monitoring program to establish baseline concentrations prior to the operation of a nuclear facility. Soil analysis, although useful in special cases involving unexpected releases, is a poor technique for assessing small incremental releases and is therefore not recommended as a method for routine monitoring releases of radioactive material. Nevertheless, because soil is an integrator and a reservoir of long-lived radionuclides, and serves as an intermediary in several of the plutonium pathways of potential importance to humans, knowledge of the concentration of plutonium in soil is essential.