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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Radium and radon in the environment ： ウィキペディア英語版 Radium and radon in the environment Radium and radon are important contributors to environmental radioactivity. Radon occurs naturally in the environment as a result of decay of radioactive elements in the soil and it can accumulate in houses build on areas where such decay occurs. This radon is among major causes of cancer, estimated to contribute to about 2% of all cancer related deaths in Europe. Radium, like radon, is a radioactive element and it is found in small quantities in nature and may thus be hazardous to life if concentrated. Radium has its origins as a decay product of certain isotopes of uranium and thorium.〔Kirby et al. p. 3〕 Radium may also be released to the environment as a result of human activity, for example, in inproperly discarded products painted with radioluminescent paint. == Radium == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Radium and radon in the environment」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.