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| 单词 | potassium–argon |
| 释义 | > as lemmaspotassium–argon potassium–argon n. (attributive) designating or relating to a method of isotopic dating based on measurement of the relative amounts in rock of potassium-40 and its decay product, argon-40. ΘΚΠ the world > matter > chemistry > experiments > [noun] > scientific method > of isotopic dating thorium lead1914 potassium–argon1953 1953 Bull. Geol. Soc. Amer. 64 1473 (heading) Potassium argon studies at the University of Toronto. 1983 E. C. Minkoff Evolutionary Biol. xvi. 268/1 Potassium-argon (K/Ar) dates may easily be determined because potassium is a common constituent of many rocks and because argon is not usually trapped inside rocks except as a product of radioactive decay. 1993 Sci. Amer. Jan. 86/2 Potassium-argon dating has assisted geochronologists in outlining the time scale of biological evolution over the past 500 million years. < as lemmas |
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