The half-lives of different radioisotopes are given in the table below. How long

Question

The half-lives of different radioisotopes are given in the table below. How long would it take (in minutes) for the amount of indium-117 to decrease from 40.0 mg to 5.00 mg?                     

                    Radioistope /  Half-life (min)                 

                    argon-44  / 12                 

                    lead-196 /  37                 

                    potassium-44 /  22                 

                                     indium-117 /  43

Explanation / Answer

Amount left(mg) Time taken(min)

Initial amount 40 0

First half life 20 43

Second half life 10 43

Third half life 5 43

Total time taken= 129 min.

Answer = 129 minute.

Hope this helps.

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