1.1 这些试验方法包括核级氧化钆粉末的化学和质谱分析程序，以确定是否符合规范。 1.2 分析程序按以下顺序出现: 小节 直接燃烧法测定碳的导热系数 2. C1408 氧化铀中碳（总量）的试验方法 直接燃烧红外法测定粉末和球团 检测方法 3. 热水解离子法测定总氯和氟- 选择性电极 4. C1502 测定总氯和 二氧化铀和氧化钆中的氟 3. 点火失重 8 – 14 燃烧碘量滴定法测定硫 5. 火花源质谱法测定杂质元素 方法 C761 化学、质谱、， 光谱化学、核化学和放射化学分析 六氟化铀 3. C1287 测定杂质的试验方法 感应法测定核级铀化合物 耦合等离子体质谱 3. 按杂质计的氧化钆中的钆含量 校正方法 15 – 18 1.3 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。 1.4 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。 有关具体的危险说明，请参阅第节 6. . 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====== 4.1 氧化钆粉末在随后的处理中用于核燃料应用，例如添加到二氧化铀中。这些测试方法旨在确定材料是否符合规范中所述的要求 C888 . 4.1.1 对材料进行分析，以确定其是否包含规定的最低氧化钆含量。 4.1.2 测定点火损失和杂质含量，以确保不超过规定杂质元素的重量损失和最大浓度限值。

1.1 These test methods cover procedures for the chemical and mass spectrometric analysis of nuclear-grade gadolinium oxide powders to determine compliance with specifications. 1.2 The analytical procedures appear in the following order: Sections Carbon by Direct Combustion—Thermal Conductivity 2 C1408 Test Method for Carbon (Total) in Uranium Oxide Powders and Pellets By Direct Combustion-Infrared Detection Method 3 Total Chlorine and Fluorine by Pyrohydrolysis Ion— Selective Electrode 4 C1502 Test Method for Determination of Total Chlorine and Fluorine in Uranium Dioxide and Gadolinium Oxide 3 Loss of Weight on Ignition 8 – 14 Sulfur by Combustion—Iodometric Titration 5 Impurity Elements by a Spark-Source Mass Spectrographic Method C761 Test Methods for Chemical, Mass Spectrometric, Spectrochemical, Nuclear, and Radiochemical Analysis of Uranium Hexafluoride 3 C1287 Test Method for Determination of Impurities in Nuclear Grade Uranium Compounds by Inductively Coupled Plasma Mass Spectrometry 3 Gadolinium Content in Gadolinium Oxide by Impurity Correction Method 15 – 18 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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. For specific hazard statements, see Section 6 . 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 ====== 4.1 Gadolinium oxide powder is used, with subsequent processing, in nuclear fuel applications, such as an addition to uranium dioxide. These test methods are designed to determine whether the material meets the requirements described in Specification C888 . 4.1.1 The material is analyzed to determine whether it contains the minimum gadolinium oxide content specified. 4.1.2 The loss on ignition and impurity content are determined to ensure that the weight loss and the maximum concentration limit of specified impurity elements are not exceeded.