| 单词 | neptunium series |
| 释义 | neptunium series in British Englishnoun a radioactive series that starts with plutonium-241 and ends with bismuth-209. Neptunium-237 is the longest-livedmember of the series. The series does not occur in nature neptunium series in American English the radioactive series of nuclides starting with neptunium-237, with a half-life of 2.2 x 106 years, and ending with stable bismuth-209: many radionuclides, as plutonium-241 and uranium-237, eventually decay into neptunium-237 and are often considered members of the neptunium series |
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