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采用全蒸发技术、离子流强度积分的方式 ,用多接收器热表面电离质谱计测量铀同位素丰度。全蒸发技术可克服质量分馏效应带来的测量误差 ,而直接实现准确测量。开发了用于全蒸发技术的测量软件 ,对影响测量结果的因素 ,诸如分析用样量、信号损失与试样残留等进行了研究。最后得出在铀同位素丰度比为 0 1～ 10的范围内 ,95 %的置信水平下 ,该方法的相对扩展不确定度为0 10 %
Uranium isotope abundance was measured by multi-receiver thermal surface ionization mass spectrometry using the technique of total evaporation and ion current intensity integration. Evaporation technology overcomes the measurement error caused by the mass fractionation effect and directly realizes the accurate measurement. Development of measurement software for pervaporation developed a number of factors that influence the measurement results, such as analytical sample size, signal loss and sample residue. In the end, it is concluded that in the uranium isotope abundance ratio range from 0 1 to 10, the relative expansion uncertainty of this method is 0 10% under the confidence level of 95%