16. Radon, decaying, turns into RaA, which experiences α-decay. Calculate the time tmax after which the maximum amount of RaA will accumulate if there was pure radon at the beginning. Calculate the maximum amount of RaA (in grams) if the initial amount of radon occupies a volume of 0.65 cm3 under normal conditions and τ'1/2=3.82 days and τ''1/2=3.05 min. Determine the number of radon atoms and RaA after 5 hours.

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