1.1 本试验方法包括测量六氟化铀（UF）裂变产物发射的伽马能 6. )和硝酸铀酰溶液。这种测试方法也可用于测量某些铀衰变产物的浓度。旨在提供一种证明符合UF的方法 6. 规格 C787 和 C996 ，硝酸铀酰规格 C788 和铀精矿规范 C967 . 1.2 检测下限估计为5000 MeV Bq/kg（MeV 公斤 1. s 1. )铀，是待测核素的单个报告限值平方和的平方根。检测极限是在纯的、老化的天然铀（ANU）溶液上测定的。该值取决于检测器效率和可以实现的背景。 1.3 要测量的裂变产物核素是 106 Ru/ 106 Rh， 103 Ru， 137 反恐精英， 144 总工程师， 144 公共关系， 141 总工程师， 95 Zr， 95 Nb，以及 125 Sb。在可以测量的铀衰变产物核素中有 231 Pa.应根据数据质量目标的要求，识别和量化光谱中可检测水平的其他伽马能裂变和铀衰变核素。 1.4 以国际单位制表示的数值应视为标准。此外，千电子伏特和兆电子伏特的非国际单位制单位应视为标准单位。本标准不包括其他计量单位。 1.5 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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 超滤膜中的特定伽马射线放射性核素 6. 使用包括高分辨率锗探测器的高分辨率伽马射线能量分析系统来识别和量化。该试验方法应符合的健康和安全规范 C787 , C788 和 C996 关于再加工铀溶液中适用的裂变产物。该试验方法也可用于向转换设施等各方提供有关此类材料中铀衰变产物水平的信息。Pa-231是一种特定的铀衰变产物，可能存在于铀精矿中，可通过伽马光谱法进行分析。

1.1 This test method covers the measurement of gamma energy emitted from fission products in uranium hexafluoride (UF 6 ) and uranyl nitrate solution. This test method may also be used to measure the concentration of some uranium decay products. It is intended to provide a method for demonstrating compliance with UF 6 Specifications C787 and C996 , uranyl nitrate Specification C788 , and uranium ore concentrate Specification C967 . 1.2 The lower limit of detection is estimated at 5000 MeV Bq/kg (MeV kg -1 /s -1 ) of uranium and is the square root of the sum of the squares of the individual reporting limits of the nuclides to be measured. The limit of detection was determined on a pure, aged natural uranium (ANU) solution. The value is dependent upon the detector efficiency and background that can be achieved. 1.3 The fission product nuclides to be measured are 106 Ru/ 106 Rh, 103 Ru, 137 Cs, 144 Ce, 144 Pr, 141 Ce, 95 Zr, 95 Nb, and 125 Sb. Among the uranium decay product nuclides that may be measured is 231 Pa. Other gamma energy-emitting fission and uranium decay nuclides present in the spectrum at detectable levels should be identified and quantified as required by the data quality objectives. 1.4 The values stated in SI units are to be regarded as standard. Additionally, the non-SI units of kiloelectron volts and megaelectron volts 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. 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 Specific gamma-ray emitting radionuclides in UF 6 are identified and quantified using a high-resolution gamma-ray energy analysis system, which includes a high-resolution germanium detector. This test method shall be used to meet the health and safety specifications of C787 , C788 , and C996 regarding applicable fission products in reprocessed uranium solutions. This test method may also be used to provide information to parties such as conversion facilities on the level of uranium decay products in such materials. Pa-231 is a specific uranium decay product that may be present in uranium ore concentrate and is amenable to analysis by gamma spectrometry.