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Several of the highest possible readings have actually been tape-recorded in Mallow, Region Cork, Ireland. Iowa has the greatest ordinary radon concentrations in the United States because of substantial glaciation that ground the granitic rocks from the Canadian Guard and also deposited it as soils comprising the rich Iowa farmland. Many cities within the state, such as Iowa City, have actually passed needs for radon-resistant construction in brand-new residences. In a few places, uranium tailings have been used for landfills and were consequently built on, causing feasible enhanced exposure to radon. Numerous home owners perform their very first radon test after a number of years of occupancy.
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