Letter: Discovery of an old radon generator.
D004326:Drinking; D049673:History, 20th Century; D006801:Humans; D009660:Northern Ireland; D011883:Radium / Q000266:history; D011886:Radon / Q000266:history*; D013270:Stomach; D013679:Technology, Radiologic / Q000266:history*
D011886:Radon; D011883:Radium