1.1 本试验方法描述了氧化钆-氧化铀颗粒或粉末中钆或铀（或两者）的X射线荧光（XRF）制备和分析所需的步骤。 1.2 本试验方法要求使用适当的内部标准。必须小心确定通过该方法分析的样品不包含内部标准元素，或者无论何时出现这种污染，都已进行数学校正。本试验方法中未提及此类修正。 1.3 本标准包含解释性注释，不属于本标准强制性要求的一部分。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 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。 具体预防措施见第节 8. 以及整个方法中的各种注释。 1.6 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 本试验方法适用于含有1至10的样品 % 氧化钆和90至99 % “收到”基础上的氧化铀。该方法可用于测定铀、钆或两者的浓度。 5.2 可使用波长色散或能量色散X射线荧光系统，前提是系统附带的软件能够适应内部标准的使用。

1.1 This test method describes the steps necessary for the preparation and analysis by X-ray fluorescence (XRF) of gadolinium or uranium (or both) in gadolinium oxide-uranium oxide pellets or powders. 1.2 This test method requires the use of appropriate internal standard(s). Care must be taken to ascertain that samples analyzed by this method do not contain the internal standard element(s) or that this contamination has been corrected for mathematically whenever present. Such corrections are not addressed in this test method. 1.3 This standard contains notes that are explanatory and are not part of the mandatory requirements of the standard. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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 precautions are given in Section 8 and various notes throughout the method. 1.6 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 This test method is applicable to samples containing 1 to 10 % gadolinium oxide and 90 to 99 % uranium oxide on the “as received” basis. The method may be used to determine concentration of either uranium, gadolinium, or both. 5.2 Either wavelength-dispersive or energy-dispersive X-ray fluorescence systems may be used provided the software accompanying the system is able to accommodate the use of internal standards.