ラジウム
Noun
1.
radium (Ra)
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ラジウムの半減期は非常に長く、環境中に長く残存します。
Radium's half-life is very long, and it remains in the environment for a long time.
ラジウムは周期表のアルカリ土類金属に分類される元素です。
Radium is an element classified as an alkaline earth metal in the periodic table.
ラジウムはかつて医療や時計の夜光塗料に利用されましたが、その危険性が認識されて使用が制限されました。
Radium was once used in medicine and luminous paint for watches, but its dangers were recognized and its use was restricted.
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