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April 21, 2014

April 21, 2014

Posted by **Help!!** on Wednesday, April 27, 2011 at 8:22pm.

- Chemistry -
**DrBob222**, Wednesday, April 27, 2011 at 11:18pmI assume the half life is 64 days and you want to reduce the radiation to 1/8 of its original value.

k = 0.693/t_{1/2}and substitute this into the below equation.

ln(No/N) = kt.

No = 100 (an arbitrary number I picked).

N = 12.5 (100/8) = 12.5

k from above.

Solve for t in days.

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