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The radioisotope Tc is an isotope that
sometimes given to patients because it emits gamma rays and has a relatively short half-life of 6.05 h. Because
emits gamma rays, 43
can be used as a tracer when performing imaging on a specific part of the human body.
(a) Find the decay constant of "Tc (in h-l).
h-1
(b) Find the number of Tc nuclei needed to provide an activity of 2.61 pCi.
nuclei

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