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为了阐明对铀的自发裂变现象,采用热电离质谱测定法对几种类型晶质铀矿样品中的Ru、Te和Ag的同位素组成作了测定。由于自发裂变碎片有可能加入天然同位素中,在几个样品中的Ru、Te清楚地显示出了~(99)Ru、~(101)Ru、~(102)Ru、~(104)Ru,~(128)Te、~(130)Te同位素异常,而Ag由于较小的裂变产率,不能从同位素测量中得到裂变成因的Ag。从Morogoro(坦桑尼亚)某晶质铀矿得到的Ru裂变模式表明,这种晶质铀矿可能已经处于中子诱发~(235)U裂变的临界条件。
In order to clarify the spontaneous fission of uranium, the isotopic compositions of Ru, Te and Ag in several types of crystalline uranium samples were determined by thermal ionization mass spectrometry. Since the spontaneous fission fragments are likely to be added to natural isotopes, Ru, Te in several samples clearly show ~ 99 Ru, 101 Ru, 102 Ru, 104 Ru, (128) Te, ~ (130) Te isotopic anomalies, and Ag can not get fission-forming Ag due to its small fission yield. The Ru fission pattern obtained from a crystalline uranium mine in Morogoro (Tanzania) shows that this type of uranium deposit may have been at the critical condition of ~ (235) U fission induced by neutron.