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Textbook Expert
Textbook ExpertVerified Tutor
6 Jan 2022

Given information

Where it should be administered

How long should the source be left in the body.

Step-by-step explanation

Step 1.
We take the decay rate as constant and calculate the time it takes to deliver of radiation. (Note that if the calculated time is much shorter than the isotope's half-life, the approximation is reasonable; otherwise, additional approaches must be employed.)
If delivers about , then we can calculate the time required to administer a dose of radiation at rate
   

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