A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 1.00 umol of the radionuclide. First, order the samples by decreasing initial radioactivity. Then calculate how long it will take for the amount of radionuclide in each sample to decrease to 1/16 of the initial amount. time for amount of radionucdlide to decrease to 1/16 of initial amount radionuclide initial sample radioactivity symbol half-life 64 Ga (choose one) - |minutes A 3.0 minutes 31 46 Sc 21 O days 84.0 days (choose one) v 122 I 53 4.0 minutes (choose one) v I minutes 99 Mo 42 D 66.0 hours (choose one) v I hours

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