First, order the samples by decreasing initial radioactivity. Then calculate how long it will take for the amount of rad

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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
/14
of the initial amount.
91
Y
59.0days
days
39
192
Ir
74.0days
days
77
103
Ru
39.days
days
44
88
Y
107.days
days
39