Posted by rachel on Thursday, October 4, 2012 at 2:43pm.
1). 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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