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在前第四纪封闭的地质体系中,铀系元素与~(238)U系母体处于放射性平衡状态。它们在空间分布上分离的趋势是由元素化学性质的不同以及子体元素的原子在铀矿物和含铀矿物结晶格架中所处的特殊位置决定的。在表生带中存在着破坏放射性系列各元素间的平衡关系并使其独立迁移的有利条件。因此,比较长期地,完全或部份独立存在的那些长寿命元素和同位素就具有最大的可能性,其中包括~(238U)、~(234)U、~(230)Th
In the former Quaternary closed geological system, uranium elements and 238 U series precursors are in a state of radioactive equilibrium. Their tendency to separate in their spatial distribution is dictated by the chemical nature of the elements and by the particular position of the atoms of the daughter elements in the crystal lattice of uranium minerals and uranium bearing minerals. There are favorable conditions in the epiphytic belt that undermine the balance between the various elements of the radioactive series and allow them to be independently relocated. Therefore, those long-lived elements and isotopes that exist completely or partially in the longer term are most likely, including ~ (238U), ~ (234) U, ~ (230) Th