Answer:
The effective half-life is
Explanation:
From the question we are told that
The excretion half-life is
The radiation half-life is
The decay due to excretion is mathematically represented as
Where is the original number of tracers
The decay due to excretion is mathematically represented as
Now from the question we are total decay is as result of the combined decay of both processes
We have that
Substituting for the formula above
Generally the formula for half-life is
So
Substituting this into the above equation
Substituting values