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Bananas are somewhat radioactive
due to the presence of substantial
amounts
of potassium. Potassium-40 decays
by two different paths:
40
K 40Ca+B (89.3%)
1
19
20
40K k, 40 A+B* (10.7%)
19
18
The half-life for potassium decay is
1.3x10° years. Calculate the overall
and the rate constants for the
individual branch reactions.

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