A radionuclide A, with decay constant ki transforms into
a radionuclide A 2 with decay constant A,2. Assuming that at the
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initial moment the preparation contained only the radionuclide A1,
find:
(a) the equation describing accumulation of the radionuclide A 2
With time;
(b) the time interval after which the activity of radionuclide A 2
reaches the maximum value.