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 to its discovery in 1944 at Los …

2024年11月20日 · Plutonium-240 has a high rate of spontaneous fission, raising the background neutron radiation of plutonium containing it. Plutonium is graded by proportion of Pu-240. …

Plutonium-240 has a high rate of spontaneous fission, raising the background neutron radiation of plutonium. Plutonium is graded by proportion of 240 Pu: weapons grade (<7%), fuel grade …

Plutonium 240 is a fertile isotope because its fission cross-section is very low in comparison with fissile isotopes. Isotope 240Pu is formed in a nuclear reactor.

Properties and data of the isotope 240 Pu. See also: list of Plutonium isotopes. Half-life T ½ = 6561 (7) a respectively 2.0691 × 1011 seconds s. Direct parent isotopes are: 240 Am, 240 Np, …

2025年2月6日 · Plutonium (chemical symbol Pu) is a radioactive metal. Plutonium is considered a man-made element. Plutonium-239 is used to make nuclear weapons. Pu-239 and Pu-240 are …

…directly through neutron capture in plutonium-240, following the formula 240 Pu + 1 n = 241 Pu. …absorbed a neutron and became plutonium-240. This material underwent spontaneous …

The most important isotopes of plutonium in the environment from weapons testing are plutonium 239, 240, 238, and 241. Although plutonium 241 has a half-life of only 14 years, it is important …

2024年4月17日 · Plutonium-240 (Pu-240) Half-life: 6,564 years. Mode of decay: Alpha particles. Chemical properties: Solid under normal conditions, plutonium can form compounds with other …

2024年4月24日 · Plutonium-240 is a common and somewhat disappointing plutonium isotope, as it isn't very useful in itself. It can be bred from Pu-239, but it is usually an indirect byproduct …