8 The near Basin Montana is a former gold and silver mine t

8. The ______, near Basin, Montana, is a former gold and silver mine that has been converted into a radon spa with radon levels approximately 1300 ____ per liter of air which is more than 300 times the level deemed to be unsafe by the US Surgeon General and the EPA.

Solution

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8. The mines, near Basin, Montana, is a former gold and silver mine that has been converted into a radon spa with radon levels approximately 1300 pCi per liter of air which is more than 300 times the level deemed to be unsafe by the US Surgeon General and the EPA