thorium lead age 钍 ; 铅法测得的年龄
thorium-lead age method 钍铅年代测定法 ; 钍铅测年法
thorium-lead ages 钍铅年代
thorium-lead dating method 钍铅定年法
isotopic thorium-lead method 同位素钍铅法
thorium-lead age 钍 ; 钍铅法测定的年龄
The crust granites have higher lead isotope ratios and are richer in uranium lead but poorer in thorium lead.
壳型花岗岩具较高的铅同位素比值和富铀铅贫钍铅的特点；
Since the unstable nuclei exist between actinides, including thorium and stable nuclei like lead and bismuth, explosive events such as supernovae are required to produce actinides.
自不稳定核之间存在着锕系元素，包括钍和稳定核像灌了铅，铋，爆炸性事件，如超需出示锕。
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