ADVANTAGES

The geologic groups with the greatest median radon-222 activities in ground water are schist (2,500 pCi/L) and quartzite (2,300 pCi/L).
Radon-222 activities in ground water vary with time because of factors such as dilution by recharge, changes in contributing areas of the aquifer due to pumping, or seasonal fluctuations in the water table.

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