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potassium-40 |
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potassium-40 [pə′tas·ē·əm ¦fȯr·dē] (nuclear physics) A radioactive isotope of potassium having a mass number of 40, a half-life of approximately 1.31 × 109years, and an atomic abundance of 0.000122 gram per gram of potassium. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The team had to mix potassium-40 atoms differing in a trait called spin to get enough collisions to chill the gas. To date the rocks, Swisher's group used a radiometric technique that relies on the radioactive decay of potassium-40 to argon-40 over millions of years. has used the radioactive decay of potassium-40 into argon-40 to date lava flows from Lathrop Wells and the California cone. |
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