Potassium argon radioactive dating
From potassium 40 to argon 40The electron capture which causes potassium 40 to transform into argon 40 in its ground state takes place in only 0.04% of cases.This is approximately 2,500 times as much Ar as is found in natural muscovite.Thus under certain conditions Ar can be incorporated into minerals which are supposed to exclude Ar when they crystallize. envisage noble gases from the mantle (and the atmosphere) migrating and circulating through the crust, so there should be evidence of excess in crustal rocks and their constituent minerals could well be the norm rather than the exception.Beta-minus decay indicates a nucleus with too many neutrons, electron capture a nucleus with too many protons.
How can potassium 40 simultaneously have too many of both?
DR Potassium 40 is a radioisotope that can be found in trace amounts in natural potassium, is at the origin of more than half of the human body activity: undergoing between 4 and 5,000 decays every second for an 80kg man.
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