Question

If the activity of a radioactive substance is initially 591 disintegrations/min and two days later it is 299 disintegrations/min, what is the activity four days later still, or six days after the start? Give your answer in disintegrations/min.

Answer 1

We know that activity A of radioactive substance with initial activity A₀ is given by:

Given A₀=591 disintegrations/min. Then for A_2days we can write:

This gives us the value of:

So after 4 days activity is given by:

We can write

Hence activity after 4 days is approximately 151.3 disintegrations/minute.

SImilarly after 6 days activity is given by:

Hence activity after 6 days is approximately 76.5 disintegrations/minute.

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