Uranium-234

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Uranium-234

Uranium-234 is an isotope of Uranium

Isotopes of uranium

Uranium is a naturally occurring element with no stable isotopes. In other words, all uranium is radioactive and hence vanishing by radioactive decay, yet it is also found in great quantity in the earth's crust....
. In natural uranium

Natural uranium

Natural uranium refers to refined uranium with the same isotopic ratio as found in nature. It contains 0.7 % uranium-235, 99.3 % uranium-238, and a trace of uranium-234 by weight....
and uranium ore, ²³⁴U occurs as an indirect decay product

Decay product

In nuclear physics, a decay product, also known as a daughter product, daughter isotope or daughter nuclide, is a nuclide resulting from the radioactive decay of a parent isotope or precursor nuclide....
of ²³⁸U

Uranium-238

Uranium-238 , is the most common Isotopes of uranium of uranium found in nature. When hit by a neutron, it becomes uranium-239 , an unstable isotope which radioactive decay into neptunium-239 , which then itself decays, with a half-life of 2.355 days, into plutonium-239 ....
, but it makes up only 0.0055% of the raw uranium because its half-life

Half-life

The half-life of a quantity whose value decreases with time is the interval required for the quantity to decay to half of its initial value. The concept originated in describing how long it takes atoms to undergo radioactive decay but also applies in a wide variety of other situations....
of just 246,000 years is only about 1/18,000 as long as the half-life of ²³⁸U.

Large-scale extraction of ²³⁴U from natural uranium would only be feasible by isotope separation

Isotope separation

Isotope separation is the process of concentrating specific isotopes of a chemical element by removing other isotopes, for example separating natural uranium into enriched uranium and depleted uranium....
similar to that used for uranium enrichment, and there is no industrial demand for isolating U-234.

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Encyclopedia

Uranium-234 is an isotope of Uranium

Isotopes of uranium

Natural uranium

Decay product

Uranium-238

Half-life

Isotope separation

Ion exchange

Ion exchange is an exchange of ions between two electrolytes or between an electrolyte solution and a complex . In most cases the term is used to denote the processes of purification, separation, and decontamination of aqueous and other ion-containing solutions with solid polymeric or mineralic 'ion exchangers'....
) from pure plutonium-238

Plutonium-238

Plutonium-238, is a radioactive isotope of plutonium with a half-life of 87.7 years and is a very powerful alpha emitter. Because of its high level of alpha activity, it is used for radioisotope thermoelectric generators and radioisotope heater units....
which has been aged to allow some of it to decay to ²³⁴U.

Enriched uranium

Enriched uranium

Enriched uranium is a kind of uranium in which the percent composition of uranium-235 has been increased through the process of isotope separation....
contains more U-234 than natural uranium as a side-effect of enrichment for U-235, which concentrates lighter isotopes even more. The increased level of U-234 in enriched natural uranium is acceptable in current nuclear reactors but re-enriched reprocessed uranium

Reprocessed uranium

Reprocessed uranium is the uranium recovered from nuclear reprocessing, as done commercially in France, the UK and Japan and by nuclear weapons states' military plutonium production programs....
may contain higher levels which are undesirable.

²³⁴U has a neutron absorption cross section

Cross section

Cross section can refer to:* Cross section , a three-piece rock band from the Mornington Peninsula, Australia* Cross section , the intersection of a 3-dimensional body with a plane...
of 100 barns for thermal neutrons, and 700 barns for resonance integral, an average over neutrons of various intermediate energies. Hence, in a thermal reactor

Thermal reactor

A thermal reactor uses slow or thermal neutrons. Most power reactors are of this type. These type of reactors use a neutron moderator to slow neutrons until they approach the average kinetic energy of the surrounding particles, that is, to reduce the speed of the neutrons to low velocity thermal neutrons....
, it is converted to fissile

Fissile

In nuclear engineering, a fissile material is one that is capable of sustaining a chain reaction of nuclear fission.All known fissile materials are capable of sustaining a chain reaction in which either thermal or slow neutrons or fast neutrons predominate....
²³⁵U at a faster rate than the much larger amount of ²³⁸U (with an absorption cross section of 2.7) is converted to ²³⁹Pu. Thus spent nuclear fuel

Spent nuclear fuel

File:Spent nuclear fuel hanford.jpgSpent nuclear fuel, occasionally called used nuclear fuel, is nuclear fuel that has been irradiated in a nuclear reactor to the point where it is no longer useful in sustaining a nuclear reaction....
should contain only some of the ²³⁴U that was in the fresh fuel.

Depleted uranium

Depleted uranium

Depleted uranium is uranium primarily composed of the isotope uranium-238 . Natural uranium is about 99.27 percent U-238, 0.72 percent uranium-235, and 0.0055 percent uranium-234....
contains much less U-234 (around 0.001% ) which makes the radioactivity of depleted uranium about one-half of that of natural uranium, since natural uranium has an "equilibrium" concentration of ²³⁴U, and therefore an equal number of decays of ²³⁸U and ²³⁴U will occur. Depleted uranium also contains less U-235, but in spite of its half-life which is shorter than U-238's, the concentration of U-235 in natural uranium is low enough so that the U-235 depletion does not result in a significant reduction in radioactivity.

Uranium-234

See also