自然界的铅按铅同位素的演化可分为原生铅、原始铅、普通铅和异常铅(J型铅)。 它是一种放射成因铅含量升高的铅。在这种异常铅中,206Pb、207Pb、208Pb的含量比同时代普通铅中206Pb、207Pb、208Pb的含量高。 异常铅通常发生在富含铀、钍的岩石或矿物中,它经历了两个或两个以上的演化阶段,所以常把多阶段演化的铅叫做异常铅。
异常铅二次等时线是普通铅同位素地质学研究中非常重要的一个课题。
The study on secondary isochron of anomalous lead is a very important problem in the common lead isotope geology.
具有高放射性异常铅的穆家庄铜矿床位于南秦岭造山带柞(水)山(阳)地区的泥盆系中。
The Mujiazhuang copper deposit with high radioactive lead isotope compositions is located in Zha-shan area of the South Qinling Orogenic Belt.
目的比较不同血铅水平儿童的感觉综合训练效果,为有效预防儿童异常行为的发生提供依据。
Objective To compare the effect of different blood-lead levels on sensory integrative treatment in preschool children, and provide a basis for preventing abnormal behavior problems efficiently.
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