How does potassium argon dating work

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How does radioactive dating work?

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How does radioactive dating work? | Naked Science Forum

Started by chris Board Technology. Started by Joe L. Ogan Board The Environment. Started by Jolly Board Technology. Science News Features. Interviews Answers to Science Questions. How does radioactive dating work?
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The isotope potassium decays into argon at a predictable rate. By measuring the ratio of the two present in a rock, we can work out how long it is since the rock was formed from magma. Measuring the quantities of the isotopes is very easy with a mass spectrometer. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.
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By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. The Washington Post article Scientists discover hundreds of footprints left at the dawn of modern humanity describes the geological dating of stratified layers of mud by analyzing and dating minerals within each layer. But since floods jumble materials of different origins and ages together, that meant the scientists had to date dozens of different minerals. The youngest crystal in the footprint layer would represent the oldest possible age for the prints; the oldest crystal in the layer above it would represent the youngest they could be. Using the argon-argon dating technique, by which scientists measure the decay of an isotope called Argon into Argon in order to find the age of crystals, they came up with a rough approximation of the footprints' age: 19, years at the oldest, 10, or 12, years at the youngest.
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