堆后铀产品中232U测定方法研究

²³²U是燃料元件制造中需严格控制的铀同位素，为此，需建立一种准确的测量方法。本工作建立了一种α谱仪和质谱法相结合测定铀产品中²³²U含量的新方法。采用质谱法测量²³⁴U、²³⁵U、²³⁶U与²³⁸U的同位素丰度比，α谱仪测量²³²U的活度和²³⁴U、²³⁵U、²³⁶U、²³⁸U的总活度，即可计算出铀产品中²³²U的浓度。对于²³²U含量为1.118 ng/g的样品，16次测定数据的相对标准偏差为3.43%，证明该测量方法有效，可应用于实际样品的分析测定。

Investigation of Determination Method for 232 U Concentration in Reprocessed Uranium

²³²U concentration is stringently controlled in nuclear fuel fabrication, an accurate determination method for determining ²³²U concentration is needed. An analytical method was developed for the measurement of ²³²U by combining of α spectrometry and mass spectrometry. The isotopic abundances ratio of ²³⁴U, ²³⁵U and ²³⁶U to ²³⁸U in samples were obtained with mass spectrometry, and the total activities of ²³⁴U, ²³⁵U, ²³⁶U and ²³⁸U, and the activity of ²³²U were measured with α spectrometry. The concentration of ²³²U can be calculated. The uncertainty of the results was evaluated. The relative standard deviation of 16 analysis using this method is 3.43% for the samples with 1.118 ng/g ²³²U. The results show that this method can be used for routine analysis in nuclear fuel fabrication plant.