Any fission reactor basically works the same ... There are three isotopes of uranium: U-238, U-235, and U-234. Uranium decays naturally, and highly active isotopes are now in short supply.

Central to this phenomenon was the concentration of uranium-235 (U-235), a naturally ... down the neutrons released from fission so they can sustain a chain reaction at a controlled rate.

Like uranium 235, element 94 would be an incredibly ... achieved a controlled and sustained nuclear fission chain reaction. During the last months of the war, a small group of scientists working ...

Scientists have discovered that a piece of uranium extracted from an African mine is a two billion-year-old natural nuclear ...

However, between the 1950s and 1970s, the US Department of Energy enriched some reprocessed uranium extracted from spent reactor fuel in order to reclaim the U-235 that did not fission. Unlike natural ...

Most new nuclear fission reactors being built today are of the light water reactor (LWR ... they are also essentially limited to uranium (U-235) fuel. This is where fast neutron reactors are ...