由早先报导的文献指出,用已知量的铀的轻同位素U~(235)和U~(238)加入到分析试料中,可提高光谱方法测定铀的通用性和精确度。现在对这个方法研究已经有了新的进展,可保证取得光谱结果的精确度为±1—2％。等黑度法按加入同位素法计算浓度时所必用的基本关系表示如下: 试中,B_(85)——同位素组分线的相对强度; K——天然铀中U~(235)的估计含量系数(≈0.007); According to the previously reported literature, adding known amounts of U isotopes U 235 and U 238 to uranium can increase the versatility and accuracy of spectrometric methods for uranium determination. Now that new advances have been made in the study of this method, the accuracy of spectral results is guaranteed to be ± 1-2%. The basic relations necessary for the blackness method to calculate the concentration by isotopic method are as follows: In the test, the relative intensity of the B_ (85) -isotope component line; K - the estimated content of U ~ (235) in natural uranium Coefficient (≈0.007);