[en] Nuclear properties of plutonium isotopes have been discussed briefly. The most important nuclear property of the most important and abundant isotopes of plutonium ²³⁹Pu is its fissility with all the energy spectrum of neutrons. The additional great importance of plutonium-239 comes from its ability to be ideal fuel for a fast breeder reactor which makes it possible to produce energy from practically all the uranium present instead of from mere 1% possible from thermal reactors. The important fission characteristics of ²³⁹Pu has also been discussed. A discussion has been made though not exhaustive how nuclear properties of plutonium are of importance to different stages in nuclear technology. (author). 57 refs., 13 tabs., 3 figs