カリウム40
1. Potassium-40Potassium-40 (K) is a radioactive isotope of potassium which has a very long half-life of 1.248×10 years, or about 3.938×10 seconds. Potassium-40 is a rare example of an isotope that undergoes all three types of beta decay. About 89.28% of the time, it decays to calcium-40 (Ca) with emission of a beta particle with a maximum energy of 1.33 MeV and an antineutrino. About 10.72% of the time it decays to argon-40 (Ar) by electron capture, with the emission of a 1.460 MeV gamma ray and a neutrino.
Read “Potassium-40” on English Wikipedia
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Read “Potassium-40” on DBpedia
Read “Potassium-40” on English Wikipedia
Read “カリウム40” on Japanese Wikipedia
Read “Potassium-40” on DBpedia
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