1.1 本试验方法包括 241 在不含大量放射性裂变产物或其他高比放射性伽马射线发射器的硝酸钚溶液样品中，通过伽马射线光谱法测定Am。 1.2 此测试方法可用于确定 241 钚金属、氧化物和其他固体形式的样品中的Am，当对固体进行适当取样和溶解时。 1.3 以国际单位制表示的数值应视为标准。 此外，电子伏特、千电子伏特和升的非国际单位制单位应视为标准单位。本标准中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。 1.5 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 此测试方法允许确定 241 在钚溶液中，没有从钚中分离出镅。它通常适用于任何含有 241 是 5.2 这个 241 当固体钚材料溶解时，可以测定这些材料中的Am（见实施规程 C1168 )。 5.3 当钚溶液含有不可接受水平的裂变产物或其他材料时，可在- 正辛基氧化膦（TOPO）萃取、离子交换或其他类似分离技术（见试验方法 C758 和 C759 )。 5.4 与α计数相比，该试验方法较少受到钚的干扰，因为用于分析的伽马射线能量比用于α计数的α粒子能量更好地从其他伽马射线中分辨出来。 5.5 最少的样品制备减少了样品处理量和对分析员的暴露。 5.6 此测试方法仅适用于均匀溶液。 此测试方法不适用于含有固体的溶液。 5.7 解决方案包含 241 浓度低至1的Am × 10 −5 g/L可以使用该方法进行分析。下限取决于所使用的检测器和计数几何结构。含有高浓度的溶液可在适当稀释后进行分析。

1.1 This test method covers the quantitative determination of 241 Am by gamma-ray spectrometry in plutonium nitrate solution samples that do not contain significant amounts of radioactive fission products or other high specific activity gamma-ray emitters. 1.2 This test method can be used to determine the 241 Am in samples of plutonium metal, oxide and other solid forms, when the solid is appropriately sampled and dissolved. 1.3 The values stated in SI units are to be regarded as standard. Additionally, the non-SI units of electron volts, kiloelectron volts, and liters 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. 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 This test method allows the determination of 241 Am in a plutonium solution without separation of the americium from the plutonium. It is generally applicable to any solution containing 241 Am. 5.2 The 241 Am in solid plutonium materials may be determined when these materials are dissolved (see Practice C1168 ). 5.3 When the plutonium solution contains unacceptable levels of fission products or other materials, this method may be used following a tri-n-octylphosphine oxide (TOPO) extraction, ion exchange or other similar separation techniques (see Test Methods C758 and C759 ). 5.4 This test method is less subject to interferences from plutonium than alpha counting since the energy of the gamma ray used for the analysis is better resolved from other gamma rays than the alpha particle energies used for alpha counting. 5.5 The minimal sample preparation reduces the amount of sample handling and exposure to the analyst. 5.6 This test method is applicable only to homogeneous solutions. This test method is not suitable for solutions containing solids. 5.7 Solutions containing 241 Am at concentrations as little as 1 × 10 −5 g/L may be analyzed using this method. The lower limit depends on the detector used and the counting geometry. Solutions containing high concentrations may be analyzed following an appropriate dilution.