Fissile elements are those in which the nucleus will fission or split, thus releasing energy. The two which are involved in nuclear reactors are uranium 235 and plutonium 239. Uranium is the only naturally occurring one, plutonium is created when uranium 238 is irradiated in a reactor, and when chemically separated and purified it can be used together with uranium for further supplies of nuclear fuel.
When a uranium 235 nucleus captures a neutron, it splits into two other nuclei, of lower atomic number (the fission products) and also releases another 2 or 3 neutrons, plus a lot of energy. By adjusting the balance between allowing neutrons to find U235 nuclei, and absorbing them in other material in the reactor, the reactor can be adjusted to just continue at a steady neutron flux level and hence a steady power level.
possible fissile isotopes usable as fuel:uranium-235plutonium-239uranium-233
Periodic table groups elements with same properties together. It makes the study of elements easier.
All elements become ions when you add or subtract electrons.
Magnesium sulfr
Acetic Acid which is CH3COOH
This characteristics is the possibility to be fissile when bombarded with neutrons and to maintain a chain reaction.
Fissile and/or fusible elements, chemical explosives to start the reaction, electronics to handle arming/disarming/firing, etc.
The isotopes 233U and 235U are fissile with thermal neutrons and the isotope 238U is fissile with fast neutrons.
This means the breeding of fissile material from non-fissile. Thus for example Pu239 results from irradiating U238 which is not fissile. Thorium can also be used to breed fissile uranium.
Because these are the only two elements (isotopes: Uranium 235, plutonium 239 and plutonium 241, fissile with thermal neutrons) that have fissile isotopes which can sustain a chain reaction in conjunction with a moderator, that is in a so called thermal reactor like PWR or BWR. Uranium 238 is fissile with fast neutrons though it will not sustain a chain reaction by itself, and would only be a significant source of power in a fast reactor. In a thermal reactor it captures neutrons and forms Pu-239 which then does add to the reactor's fissile fuel. Some other transuranic elements have fissile isotopes but they are not used as it is much easier and cheaper to use uranium produced from uranium ore. Also thorium can be used in nuclear reactors as a fertile isotope.
Its one of only 2 elements that have fissile isotopes, the other is plutonium which must be manufactured from uranium in reactors.
"Fissile" means "capable of undergoing fission."
Both are chemical elements, solid, metals, radioactive, having fissile isotopes, chemically reactive, toxic etc.
Uranium 235 and Plutonium 239 are fissile elements, fissionable with thermal neutrons.
Fissile isotopes are isotopes of an element that can be split through fission
Breeder reactors were developed to allow use of non-fissile or fertile fuel, such as uranium-238 and thorium-232, instead of fissile fuel, such as uranium-235 and plutonium-239. They do have fissile fuel in them, but they use its neutron flux to convert the non-fissile (fertile) fuel into fissile form, extending the lifespan of the core.
possible fissile isotopes usable as fuel:uranium-235plutonium-239uranium-233