A typical person of mass 65 kg contains 0.35% potassium, by weight. Of the potassium, 0.012% is 40K, an unstable nucleus that decays through β- (89.3%) and electron capture (10.7%) with a t1/2 = 1.28 x 109y. What is the 40K activity due to β- decay in a typical person’s body?

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