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233 Pu 94 139 233.042997(58) 20.9(4) min ... Plutonium-244 is the most stable isotope of plutonium, with a half-life of about 80 million years.
Implosion nuclear weapons require U-232 levels below 50 PPM (above which the U-233 is considered "low grade"; cf. "Standard weapon grade plutonium requires a Pu-240 content of no more than 6.5%." which is 65,000 PPM, and the analogous Pu-238 was produced in levels of 0.5% (5000 PPM) or less).
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.
Plutonium-239 is the primary fissile isotope used for the production of nuclear weapons, although uranium-235 is also used for that purpose. Plutonium-239 is also one of the three main isotopes demonstrated usable as fuel in thermal spectrum nuclear reactors, along with uranium-235 and uranium-233. Plutonium-239 has a half-life of 24,110 years. [1]
Plutonium-238 has a half-life of 87.7 years and emits alpha particles. ... (uranium-233 and uranium-235 are the other two); plutonium-241 is also highly fissile.
Fission product yields by mass for thermal neutron fission of U-235 and Pu-239 (the two typical of current nuclear power reactors) and U-233 (used in the thorium cycle). This page discusses each of the main elements in the mixture of fission products produced by nuclear fission of the common nuclear fuels uranium and plutonium.
Watchdogs are raising new concerns about legacy contamination in Los Alamos, the birthplace of the atomic bomb and home to a renewed effort to manufacture key components for nuclear weapons. A ...
If using a thorium fuel to produce fissile 233 U, the SNF (Spent Nuclear Fuel) will have 233 U, with a half-life of 159,200 years (unless this uranium is removed from the spent fuel by a chemical process). The presence of 233 U will affect the long-term radioactive decay of the spent fuel.