And remember, zircons are also used in radiometric dating.
请记住，锆石也用于辐射 测年。
科学杂志：地质学
If this surface is in fact fossilized lava flow, researchers may discern the lake's age, thanks to radiometric dating.
如果这个表面实际上是化石熔岩流，研究人员可以通过放射性测年法辨别出该湖的年龄。
万物简史
But even with radiometric dating, as decay measurements became known, it would be decades before we got within a billion years or so of Earth's actual age.
Radiometry is a set of techniques for measuring electromagnetic radiation, including visible light. Radiometric techniques in optics characterize the distribution of the radiation's power in space, as opposed to photometric techniques, which characterize the light's interaction with the human eye. Radiometry is distinct from quantum techniques such as photon counting.