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Neodymium-146

Main isotopes of neodymium
Iso­tope Decay
abun­dance half-life mode energy (MeV) pro­duct
142Nd 27.2% is stable with 82 neutrons
143Nd 12.2% is stable with 83 neutrons
144Nd 23.8% 2.29×1015 y α 1.905 140Ce
145Nd 8.3% is stable with 85 neutrons
146Nd 17.2% is stable with 86 neutrons
148Nd 5.8% is stable with 88 neutrons
150Nd 5.6% 6.7×1018 y ββ 3.367 150Sm
Standard atomic weight (Ar)
  • 144.242(3)

Naturally occurring neodymium (60Nd) is composed of 5 stable isotopes, 142Nd, 143Nd, 145Nd, 146Nd and 148Nd, with 142Nd being the most abundant (27.2% natural abundance), and 2 long-lived radioisotopes, 144Nd and 150Nd. In all, 33 radioisotopes of Neodymium have been characterized up to now, with the most stable being naturally occurring isotopes 144Nd (alpha decay, a half-life (t1/2) of 2.29×1015 years) and 150Nd (double beta decay, t1/2 of 7×1018 years). All of the remaining radioactive isotopes have half-lives that are less than 11 days, and the majority of these have half-lives that are less than 70 seconds. This element also has 13 known meta states with the most stable being 139mNd (t1/2 5.5 hours), 135mNd (t1/2 5.5 minutes) and 133m1Nd (t1/2 ~70 seconds).

The primary decay modes before the most abundant stable isotope, 142Nd, are electron capture and positron decay, and the primary mode after is beta decay. The primary decay products before 142Nd are element Pr (praseodymium) isotopes and the primary products after are element Pm (promethium) isotopes.




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