1.1 本规程涵盖了α光谱法中锕系元素分离馏分的制备。它适用于任何可以溶解在稀盐酸中的锕系元素。适用样品的实例将是离子交换分离的最终洗脱或溶剂萃取分离的最终剥离。 2. 1.2 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体的危险说明，请参阅第节 9 . 1.4 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 通过α光谱法测定锕系元素是许多环境和其他项目的基本功能。阿尔法光谱法允许识别和量化大多数发射阿尔法的锕系元素。尽管使用了多种分离方法，但最终样品制备技术历史上是通过电沉积（实践 第284页 ). 然而，电沉积可能有一些缺点，例如需要时间、与现有化学不相容、沉积物厚和回收率低。这些问题可以通过使用氟化钕共沉淀法来最小化，该方法的性能得到了充分的证明 ( 1- 6. ) . 4. 在较小程度上使用了氟化铈 ( 7. ) 但在本实践中未涉及。 5.2 本实践中描述的样品安装技术是快速的，增加了额外的纯化步骤，因为只有那些形成不溶性氟化物的元素被安装，并且如果出现问题，样品和过滤介质可以被溶解并重新安装。电沉积样品的回收率较好，分辨率接近正常。 回收率足够高，因此对于调查工作，如果不需要定量回收率，可以省略示踪剂。该技术的缺点包括使用非常危险的氢氟酸，以及过滤器不平坦且可能不适合长时间保持的不可重复和不明确的计数几何结构。此外，虽然共沉淀的总周转时间可能少于电沉积，但共沉淀需要分析师更多的时间和注意力。

1.1 This practice covers the preparation of separated fractions of actinides for alpha spectrometry. It is applicable to any of the actinides that can be dissolved in dilute hydrochloric acid. Examples of applicable samples would be the final elution from an ion exchange separation or the final strip from a solvent extraction separation. 2 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. For a specific hazard statement, see Section 9 . 1.4 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 determination of actinides by alpha spectrometry is an essential function of many environmental and other programs. Alpha spectrometry allows the identification and quantification of most alpha-emitting actinides. Although numerous separation methods are used, the final sample preparation technique has historically been by electrodeposition (Practice C1284 ). However, electrodeposition may have some drawbacks, such as time required, incompatibility with prior chemistry, thick deposits, and low recoveries. These problems may be minimized by using the neodymium fluoride coprecipitation method whose performance is well documented ( 1- 6 ) . 4 To a lesser extent cerium fluoride has been used ( 7 ) but is not addressed in this practice. 5.2 The sample mounting technique described in this practice is rapid, adds an additional purification step, since only those elements that form insoluble fluorides are mounted, and the sample and filter media can be dissolved and remounted if problems occur. The recoveries are better and resolution approaches normal in electrodeposited samples. Recoveries are sufficiently high that for survey work, if quantitative recoveries are not necessary, tracers can be omitted. Drawbacks to this technique include use of very hazardous hydrofluoric acid and the possibility of a non-reproducible and ill-defined counting geometry from filters that are not flat and may not be suitable for long retention. Also, although the total turn around time for coprecipitation may be less than for electrodeposition, coprecipitation requires more time and attention from the analyst.