N a radioactive series that starts with plutonium-241 and ends with bismuth-209. Neptunium-237 is the longest-lived member of the series. The series does not occur in nature 镎族
neptunium decay series翻译;[核] 镎衰变系
neptunium m series镎系
neptunium series detail镎系列
series neptunium镎系
N（名词） a radioactive series that starts with plutonium-241 and ends with bismuth-209. Neptunium-237 is the longest-lived member of the series. The series does not occur in nature 镎族