I just want to check that I have the right answer for (b). a) Indium-111 is a ra

Question

I just want to check that I have the right answer for (b).

a) Indium-111 is a radioactive isotope that decays gamma rays, with a range of 171 to 245 keV and a physical half-life of 2.8 days. Assuming that it has low toxicity, explain why this isotope would be a good choice for radionuclide imaging. Explain your answer fully making reference to its physical properties.

b) Imagine a solution of indium-111 has an initial source activity of 5 MBq. How much source activity remains after one week?
Source activity

Explanation / Answer

N(t)=N0e-t

where =1/ln2*t1/2

so N(t)=N0e-2.5/ln2

activity=e-2.5/ln2 =0.0271194633

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