Argon-40 undergoes positron emission

On the Earth, 40Ar makes up 99.6% of natural argon. ... The naturally occurring 40K, with a half-life of 1.248×109 years, decays to stable 40Ar by electron capture (10.72%) and by positron emission (0.001%), and also transforms to stable 40Ca via beta decay (89.28%).

Explanation:

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