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；

youdao

Like I said before, Uranium-Lead Dating has been with us for a while.

就像我之前说到的，铀铅年代测定法已经存在一段时间了。

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Because of this, this new way of doing Uranium-Lead Dating, we've been able to determine that one of our major assumptions about the Grand Canyon was wrong.

因为有这种新的铀铅定年方法，我们才得以确定我们对大峡谷的一个主要假设是错误的。

youdao

The Rocky Mountains are littered with ghost towns that were once thronged with men mining silver, lead or uranium.

ECONOMIST: Natural gas in Wyoming

Currently, mining -- particularly diamonds, copper, gold, zinc, lead, uranium -- constitutes more than 12% of Namibia's GDP, according to government figures.

CNN: Namibia country profile: moving on from a difficult past

The United Nation's International Atomic Energy Agency continues debating whether and how to advocate sanctions against Iran for its planned uranium enrichment program that could lead to a bomb.

NPR: Reaction in Iran to Possible U.N. Sanctions