http://www.scientificamerican.com/article.cfm?id=coal-ash-is-more-radioactive-than-nuclear-waste et http://www.cejournal.net/?p=410 Lire particulièrement les commentaires sur le CE Journal : Coal contains uranium, thorium, radium, radon and other radioactive elements at typical concentrations of several parts per million, ranging up to 50 parts per million or more [see references given below]. […]. The amount of radioactive uranium and thorium discharged by U.S. coal-fired […]
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