我们开发了一种测铀的新方法。镭组和钍系许多元素在β蜕变后伴有γ蜕变,而铀组各元素却很少如此。据此,利用β-γ反符合技术压低镭组和钍系在测铀道的β贡献,相对突出铀组的β贡献,降低了镭钍对测铀的干扰,提高了测铀精度。本方法不但可以测量一般岩石样品中的铀含量,也能测量铀镭平衡破坏偏镭和钍铀含量比高的样品中的铀。实测表明,对于钍铀含量比高达11的样品,测铀的准确度仍符合规范要求。 We have developed a new method of measuring uranium. Radium group and thorium series of many elements in the metamorphosis of β with γ metamorphism, uranium group elements are rarely the case. Therefore, the β-γ anti-coincidence technique is used to depress the β contribution of the radium and thorium systems to the uranium track, and the β contribution of the uranium group is relatively prominent, which reduces the interference of radium-thorium on the uranium and improves the accuracy of uranium determination. This method can not only measure the uranium content of rock samples in general, but also measure uranium in uranium samples with uranium-radium balance destroying the ratio of radium and thorium to uranium. The measured results show that the accuracy of uranium testing still meets the specifications for samples with a thorium-uranium content of up to 11.