Although most natural potassium nuclei are stable 39 K (93.3%) or 41 K (6.7%) nuclei, about 0.0117% are radioactive 40 K nuclei, which have a…

Although most natural potassium nuclei are stable 39K (93.3%) or 41K (6.7%) nuclei, about 0.0117% are radioactive 40K nuclei, which have a half-life of 1.26 billion years. What fraction of all the potassium nuclei in your body will undergo radioactive decay in the next 1.35-year period?

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