Business
Business, 20.10.2020 20:01, marcgtz511p3pln7

Many ancient tombs were cut from limestone rock that contained uranium. Since most such tombs are not well-ventilated, they may contain radon gas. In one study, the radon levels in a sample of 12 tombs in a particular region were measured in becquerels per cubic meter

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Many ancient tombs were cut from limestone rock that contained uranium. Since most such tombs are no...

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