A medical technician is working with the four samples of radionuclides listed in the table below. Initially, each sample contains 1.00 µmol 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 1/4 of the initial amount. sample A B C D symbol 60 27 241 95 203 82 32 15 radionuclide Co Am Pb P half-life 5.0 years 432. years 2. days 14. days initial radioactivity ✓ (choose one) 3 1 (highest) 2 3 4 (lowest) (choose one) (choose one) a time for amount of radionuclide to decrease to 1/4 of initial amount years years days days

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