Potassium-40 (40K) is a long lived and the main naturally occurring radioactive isotope of potassium. Its half-life is 1.25 billion years. It makes up about 0.012% (120 ppm) of natural …

A human body weighing 70 kg contains approximately 140 g of potassium, which is approximately 0.000117 × 140 g = 0.0164 g of the isotope 40 K; The decay causes approximately 4,300 …

Potassium-40 has two decay channels open. The beta-minus decay channel leading to calcium-40 is by far the most frequent. Decays leading to argon-40 by electronic capture occurs at a 11 …

2022年11月18日 · A predicted electron-capture decay directly to the ground state of argon-40 has never been observed. The KDK (potassium decay) collaboration reports strong evidence of …

2016年8月3日 · Over the last 78 years numerous determinations have been made of the total 40 K decay half-life, obtained by direct counting experiments and by comparing radioisotope ages …

Detailed decay information for the isotope potassium-40 including decay chains and daughter products.

2017年6月24日 · 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 (40 Ca) with emission of a beta …

1 Decay Scheme K-40 is a natural isotope with an isotopic abundance of 0.0117 (1) %. It disintegrates by beta minus emission to the Ca-40 fundamental level for 89.25 (17) %, by …

It is shown that the potassium-argon age of young minerals depends almost linearly on the decay constant for electron capture in K40 and is very insensitive to the decay constant for beta...

2022年8月24日 · Potassium-40 is a rare example of a nuclide that undergoes both types of beta decay. In about 89.28% of events, it decays to calcium-40 (Ca) with emission of a beta particle …