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April 18, 2014

April 18, 2014

Posted by **rachel** on Thursday, October 4, 2012 at 2:43pm.

- chemistry -
**Jennifer**, Thursday, October 4, 2012 at 3:14pm1). half life = ln(2) / lambda

where lambda is the radioactive decay constant

2). A(t) = 12mCi * e ^ - (lambda * t)

where t is time, A(t) is activity as a function of time

15 hr = ln2 / lambda

solve for lambda

convert 2.5 days to hours

Then t = 2.5 days * (24 hrs / day)

Plug these numbers into A(t)

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