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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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Business, 22.06.2019 11:40, tansebas1107
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Business, 22.06.2019 18:00, flowergirly34
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