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Potássio-40

O potássio-40 (40K) é um isótopo radioativo de potássio que tem uma meia-vida de 1,248 × 109 anos.

O potássio-40 é um raro exemplo de um isótopo que sofre todos os três tipos de decaimento beta. Cerca de 89,28% do tempo, ele decai para o cálcio-40 (40Ca), com emissão de partículas beta (β-, um elétron), com um máximo de energia em 1,33 MeV, e um antineutrino.

Cerca de 10,72% do tempo ele decai para o argônio-40 (40Ar), por captura de electrões, com a emissão de 1.460 MeV de raios gama e um neutrino. Muito raramente (0,001% do tempo) que irá decair para 40Ar, emitindo um pósitron (β +) e um neutrino.[1]

Referências

  1. Eduardo Motta Alves Peixoto (19 de abril de 2004). «Potássio» (PDF). Química Nova Escola. Consultado em 9 de novembro de 2023 
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Potássio-40
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