uranium-235

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Related to U235: uranium, plutonium

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 ?
(d) Calculation for amount of natural uranium: (25 kg U235)(1 kg natural uranium / 0.007 kg U235) = 3,571 kg natural uranium.
Vaglio, "U235 covariance matrix associated with JEFF3.1.1 evaluation," in Proceedings of the JEF/DOC-1360.
The parameters also state that "Iran will not use its IR-2, IR-4, IR-5, IR-6, or IR-8 models to produce enriched uranium" during this period, and that it will "engage in limited research and development with its advanced centrifuges, according to a schedule and parameters which have been agreed to by the P5+1." In addition, the amount of low-enriched stock that Iran can retain is capped at 300 kilograms of 3.67 percent-enriched uranium for the next fifteen years (i.e., uranium that contains 3.67 percent of the fissile isotope U235).
With the help of some extraordinary calculations from Peierls they came to the question: What would happen if there was a large enough quantity of pure U235? What would happen if, after a colossal industrial effort, it would be possible to produce pure U235?
Besides others, dangerous materials such as heavy water, uranium enriched U235, plutonium and their compounds, spent irradiated fuel elements from a nuclear reactor and other highly toxic and nuclear substances are named to be stored in the facility.
There are many more problems to be overcome before a nuclear station can become operational in the UK The whole process relies on the controlled splitting of atoms of highly radioactive uranium 235 (U235) in two releasing heat.
On November 16, 2009, Russia's Energy Minister indicated that the reactor would not start operations in 2009 due to "technical" reasons, but the announcement came one day after Presidents Barack Obama and Dmitry Medvedev expressed concerns in a meeting in Singapore about Iran's uranium enrichment program.) (38) In February 2010, Russia joined France and the United States in criticizing Iran when it announced a plan to enrich uranium to 20% U235, developments that further increased pressure on the PRC to sanction Iran.
With the current disclosed rate of UF6 20% growth, Iran will have enough 20% U235 stock for more than one nuclear bomb's worth of 90% U235 by this coming April 2013.
The PFN tool measures the amount of the isotope U235 that is present in all natural uranium.
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.