1.1 这些做法旨在为核工业提供从铀精矿（UOC）中获取代表性散装样品的程序（见规范） C967 ). 1.2 这些规程还规定从原始散装样品中获取一系列具有代表性的二次样品，用于测定水分和其他试验目的，并用于制备粉状分析样品（见试验方法 C1022 和 C1843 ). 1.3 这些实践包括许多取样和样品制备的替代程序，经过核工业的长期经验证明，这些程序是令人满意的。这些程序按以下顺序描述。 阶段 程序 部分 一次采样 一级下降流 5. 两级下降流 6. 螺旋钻 7. 二次采样 直线路径（往复） 8. 旋转（Vezin） 9 , 10 1.3.1 一次和二次采样阶段可以按以下方式组织: 1.3.2 根据缔约方的商定要求，可以以不同的方式将这些阶段的各种要素结合起来，以获得满意的结果。然而，对于给定的阶段，必须将每个过程视为一个整体。混合属于不同程序的元素是非常不可取的。 1.4 这些程序不包括健康、安全和责任要求。遵守这些惯例并不免除用户了解和遵守与铀精矿加工、运输或使用有关的所有适用国际、联邦、州和地方法规的义务。（指导见CFR 10第1章。） 1.5 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 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。

1.1 These practices are intended to provide the nuclear industry with procedures for obtaining representative bulk samples from uranium-ore concentrates (UOC) (see Specification C967 ). 1.2 These practices also provide for obtaining a series of representative secondary samples from the original bulk sample for the determination of moisture and other test purposes, and for the preparation of pulverized analytical samples (see Test Methods C1022 and C1843 ). 1.3 These practices consist of a number of alternative procedures for sampling and sample preparation which have been shown to be satisfactory through long experience in the nuclear industry. These procedures are described in the following order. Stage Procedure Section Primary Sampling One-stage falling stream 5 Two-stage falling stream 6 Auger 7 Secondary Sampling Straight-path (reciprocating) 8 Rotating (Vezin) 9 , 10 1.3.1 The primary and secondary sampling stages can be organized in the following way: 1.3.2 It is possible to combine the various elements of these stages in different ways to give satisfactory results depending on the agreed requirements of the contracting parties. For a given stage, however, each procedure must be regarded as a whole. It is highly inadvisable to mix elements belonging to different procedures. 1.4 These procedures do not include requirements for health, safety, and accountability. The observance of these practices does not relieve the user of the obligation to be aware of and to conform to all applicable international, federal, state, and local regulations pertaining to processing, shipping, or using uranium-ore concentrates. (Guidance is provided in CFR 10, Chapter 1.) 1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.6 This standard does not purport to address all of the safety problems, 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.