Plutonium-241 (241Pu or Pu-241) is an isotope of plutonium formed when plutonium-240 captures a neutron. Like some other plutonium isotopes (especially...

half-life of 1.23 μs. The presence of 241Am in plutonium is determined by the original concentration of plutonium-241 and the sample age. Because of the low penetration...

experiments have not yet been sensitive enough to detect it. Both plutonium-239 and plutonium-241 are fissile, meaning they can sustain a nuclear chain reaction...

but can fuel fast reactors. Plutonium-241 is fissile, but beta decays with a half-life of 14 years to americium-241. Plutonium-242 is not fissile, nor very...

(Pu/U)0 time dependence. Unlike plutonium-238, plutonium-239, plutonium-240, plutonium-241, and plutonium-242, plutonium-244 is not produced in quantity...

Plutonium-240 (240 Pu or Pu-240) is an isotope of plutonium formed when plutonium-239 captures a neutron. The detection of its spontaneous fission led...

decays, uranium-238 becomes plutonium-239, which, by successive neutron capture, becomes plutonium-240, plutonium-241, plutonium-242, and (after further beta...

low[citation needed] to reduce production of the heavier plutonium isotopes like plutonium-240 and plutonium-241. The design initially called for the core to be...

years in the future). The plutonium from a power reactor tends to have a greater amount of plutonium-241 than the plutonium generated by the lower burnup...

used pits made with uranium-235 alone, or as a composite with plutonium. All-plutonium pits are the smallest in diameter and have been the standard since...