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posted by jezebel Monday, September 10, 2012 at 5:45pm.
Iodine-131 has a half life of eight days. What mass of iodine-131 would remain from a 20g sample after 32 days?
k = 0.693/t_{1/2} ln(No/N) = kt No = 20g N = solve for this k from above. t = 32 days.
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