1.1 本试验方法包括测定核级二氧化铀粉末和芯块中的铀和氧铀原子比。 1.2 本试验方法不包括预防临界事故的规定或健康和安全要求。遵守本试验方法并不免除用户了解并遵守与拥有、运输、加工或使用源核材料或特殊核材料有关的所有国际、国家或联邦、州和地方法规的义务。 1.3 本试验方法也适用于UO 3. 和U 3. O 8. 粉 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。 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 测试方法旨在显示材料是否符合规范中给出的规范 C753 或 C776 . 5.2 粉末的化学计量比有助于预测球团生产过程中氧化物的烧结行为。

1.1 This test method covers the determination of uranium and the oxygen to uranium atomic ratio in nuclear grade uranium dioxide powder and pellets. 1.2 This test method does not include provisions for preventing criticality accidents or requirements for health and safety. Observance of this test method does not relieve the user of the obligation to be aware of and conform to all international, national, or federal, state and local regulations pertaining to possessing, shipping, processing, or using source or special nuclear material. 1.3 This test method also is applicable to UO 3 and U 3 O 8 powder. 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. 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 The test method is designed to show whether or not a material meets the specifications as given in Specifications C753 or C776 . 5.2 The powder’s stoichiometry is useful for predicting the oxide's sintering behavior in the pellet production process.