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neptunium series

British

noun

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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neptunium series

The neptunium series, previously thought to terminate with bismuth-209, terminates with thallium-205.

From Textbooks ● Feb. 14, 2019

The neptunium series is a fourth series, which is no longer significant on the earth because of the short half-lives of the species involved.

From Textbooks ● Feb. 14, 2019

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