long-lived isotope
... longitudinal section 纵切面，纵切片 long lived isotope 长寿命同位素 long neck round bottom flask 长颈圆底烧瓶 ...
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锘在锕类元素中的一种放射性超铀元素，人工微量制造，其最长寿命的同位素是锘255，其。
A radioactive transuranic element in the actinide series, artificially produced in trace amounts. Its longest-lived isotope is No255 with a half-life of3 minutes. Atomic number102.
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