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The isotopes of neptunium range from 219 Np to 244 Np, though the intermediate isotope 221 Np has not yet been observed. The primary decay mode before the most stable isotope, 237 Np, is electron capture (with a good deal of alpha emission), and the primary mode after is beta emission. The primary decay products before 237 Np
The longest-lived isotope of neptunium, neptunium-237, is a by-product of nuclear reactors and plutonium production. This isotope, and the isotope neptunium-239, are also found in trace amounts in uranium ores due to neutron capture reactions and beta decay. [7]
The 4n + 1 chain of neptunium-237 is commonly called the "neptunium series" or "neptunium cascade". In this series, only two of the isotopes involved are found naturally in significant quantities, namely the final two: bismuth-209 and thallium-205.
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds. [1]
Pages in category "Isotopes of neptunium" ... Neptunium-245 This page was last edited on 29 March 2013, at 21:23 (UTC). Text is available under the Creative ...
The most important isotopes of these elements in spent nuclear fuel are neptunium-237, americium-241, americium-243, curium-242 through -248, and californium-249 through -252. Plutonium and the minor actinides will be responsible for the bulk of the radiotoxicity and heat generation of spent nuclear fuel in the long term (300 to 20,000 years in ...
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Isotopes of neptunium (33 P) Isotopes of neutronium (11 P) Isotopes of nickel (47 P) ... Pages in category "Isotopes" The following 45 pages are in this category, out ...