用缓发中子计数法测定微量铀具有灵敏、准确、干扰少、迅速、非破坏、成本低和可自动分析大量样品等优点。原子能研究院缓发中子测铀装置测天然铀的探测极限为0.05ppm,至今已分析了4千多个土壤、水系沉积物、地质化探样品、标准参考物等,均获得了满意的结果。然而植物、牧草、蔬菜、粮食、高岭土等样品中天然铀的含量比土壤要低1～2个数量级,为此要进一步提高测量的灵敏度。 Determination of trace amounts of uranium by the slow neutron counting method is sensitive, accurate, less perturbing, rapid, non-destructive, low cost and can automatically analyze a large number of samples and other advantages. Atomic Energy Institute slow neutron measurement uranium device detection of natural uranium detection limit of 0.05ppm, so far has been analyzed more than 4,000 soil, sediments, geochemical exploration samples, standard reference, etc., have been satisfied with the results . However, the content of natural uranium in plants, pastures, vegetables, grains, kaolins and so on is 1 to 2 orders of magnitude lower than that of soils, so the sensitivity of measurement should be further improved.