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The radioisotope ⁹⁹₄₃Tc is an isotope that is sometimes given to patients because it emits gamma rays and has a relatively short half-life of 6.05 h. Because it emits gamma rays, ⁹⁹₄₃Tc can be used as a tracer when performing imaging on a specific part of the human body.

(a)

Find the decay constant of ⁹⁹₄₃Tc (in h⁻¹).

(b)

Find the number of ⁹⁹₄₃Tc nuclei needed to provide an activity of 2.49 µCi.

Answer 1

os sol? Tya bosh 13th the in) = 10158"] I o A = Noxe-nt A = Not » Nost No a parte for t=0 No = 801130.4348 hr = 80113014048 see No = 2.884 X109 - Nuclei