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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]
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The palladium forms an alloy with the fission tellurium. This alloy can separate from the glass. 107 Pd is the only long-living radioactive isotope among the fission products and its beta decay has a long half life and low energy, this allows industrial use of extracted palladium without isotope separation. [9]
The first pure-fission bombs needed “tamper”, which was a dense metal surrounding the plutonium pit to keep it inertially confined for a millionth of a second. The tamper comprised two hemispheres that created a ball about as big as a bowling ball, with a soft ball-size pocket in the center where the plutonium pit goes.
The fission cross section for 239 Pu is 747.9 barns for thermal neutrons, while the activation cross section is 270.7 barns (the ratio approximates to 11 fissions for every 4 neutron captures). The higher plutonium isotopes are created when the uranium fuel is used for a long time.