ISO 12795:2004 核燃料技术 二氧化铀粉末和细粒 重量分析法配合杂质订正测定铀和氧/铀比
标准编号：ISO 12795:2004
中文名称：核燃料技术 二氧化铀粉末和细粒 重量分析法配合杂质订正测定铀和氧/铀比
英文名称：Nuclear fuel technology — Uranium dioxide powder and pellets — Determination of uranium and oxygen/uranium ratio by gravimetric method with impurity correction
发布日期：2004-08
标准范围
ISO 12795:2004规定了一种测定超化学计量二氧化铀(UO2+X)粉末和芯块中铀的质量分数和氧铀原子比的方法。ISO 12795:2004用于测定核级二氧化铀的U质量分数和O/U比。如果氧化物形式的杂质总量超过1500微克/克样品，则应进行U质量分数和O/U比测定中的杂质校正。较低杂质水平对O/U比的影响小于0.0005，可以忽略不计。应通过适当的技术测定非挥发性杂质，并应用校正。如果氧化物形式的非挥发性杂质的总含量大于1500微克/克样品，则该方法的总体精密度取决于这些杂质测量的准确度。
ISO 12795:2004 specifies a method of determining the mass fraction of uranium and the oxygen-to-uranium atomic ratio in hyperstoichiometric uranium dioxide (UO2+X) powders and pellets.ISO 12795:2004 is used for the determination of the U mass fraction and the O/U-ratio of nuclear grade uranium dioxide.An impurity correction in the U mass fraction and the O/U-ratio determination should be performed, if the amount of total impurities in oxide form exceeds 1 500 micrograms per gram of sample. Lower impurity levels influence the O/U-ratio by less than 0,000 5 and can be neglected. The non-volatile impurities shall be determined by an appropriate technique, and the correction applied. If the total content of the non-volatile impurities in oxide form is greater than 1 500 micrograms per gram of sample, the overall precision of the method depends on the accuracy of these impurity measurements.
标准预览图
