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It is only possible to determine the probability of decay in a certain time.
In a sample of N nuclei the number of decays per unit time is:
l
l
l
2ln
T
eN=N(t)
N
dt
dN
2/1
t -
0
Radioactive Decay
A =-dN/dt
Half Life:
The time it takes for half the amount of a radioactive material to decay
Effective half life (Te) = TpTb/(Tp+Tb)
Tp= radioactive decay
Tb= biological transport or elimination from the specific site