A) Radon gas has a half-life of 3.83 days. If 3.18 g of radon
gas is present at time t = 0, what mass of radon will
remain after 2.10 days have passed?
B) A drug tagged with 9943Tc (half-life =
6.05 h) is prepared for a patient. If the original activity of the
sample was 1.2 104 Bq, what is its activity
(R) after it has been on the shelf for 1.2 h?
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