radioactive trace的意思|示意

These minerals can be dated by radioactive decay techniques because of the very small quantities of radioactive trace elements they, in turn, contain.

这些矿物可以用放射性衰变技术测定年代，因为它们所含的放射性微量元素非常少。

A total of 485 zircons held inclusions, and about a dozen or so of these contained radioactive trace elements that allowed the researchers to determine their ages.

总共有485块锆石内部带有包体，其中有十几块包体中含有放射性微量元素，研究者可以根据它们来测定包体的年代。

"Platinum" is a powerfully radioactive trace element.

“铂”：非常有辐射力的微量元素。