短寿命同位素 [核] short-lived isotope ; short life isotope ; isotope short-lived
短寿命放射性同位素 short-lived radioisotope ; lived radioisotope
·2,447,543篇论文数据，部分数据来源于NoteExpress
在自然界很稀少，因为它所有的同位素都是短寿命的，还因为它的来源是稀有的。
It is rare in nature because all its isotopes are short-lived and because radium, its source, is scarce.
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