uranium-235

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Related to U-235: U-238

uranium-235

n.
The uranium isotope with mass number 235 and half-life 7.04 × 108 years, fissionable with slow neutrons and capable in a critical mass of sustaining a chain reaction that can proceed explosively with appropriate mechanical arrangements.

uranium-235

n
(Elements & Compounds) a uranium radioisotope that is used in nuclear fission
References in periodicals archive ?
Diluted -- down to an enrichment level of no more than 5% U-235 -- 108.
Iranhas been enriching uranium to 20 per cent concentration of the fissile U-235 isotope since early 2010, stoking Western alarm over the nature of its nuclear programme.
Iran openly has enriched uranium to 20% U-235 at this underground site.
In addition, the president contended that the administration's latest calculations indicated that supplies of U-235 would be sufficient (Cochran, Felverson, and von Hippel 2009).
Since mined uranium is less than 1% U235, it must undergo expensive and energy-intensive enrichment to reach the concentration of U-235 needed for LWR fuel.
The splitting of a U-235 atom is caused by the addition of an extra neutron.
Sanders explains, "Depleted uranium is essentially U-238, the isotope after the fissionable isotope, U-235, has been extracted from uranium ore.
While civilian reactor fuel does not contain enough U-235 to make a bomb and the unseparated plutonium found in used reactor fuel cannot be used to make an explosive without considerable reprocessing, civilian uranium enrichment and plutonium production programs can be used to make weapon-grade fissile material.
Then, the centrifuge throws the heavier U-238 atoms towards the wall, letting the rare U-235 ones accumulate near the centre.
The percentage refers to the relative amount of the U-235 uranium isotope, which is the necessary ingredient to sustain a nuclear chain reaction.
The point of enrichment is to increase the percentage of U-235 - to the 5% level for fuel for nuclear power plants, and to the 90% level for nuclear weapons.