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Collectively these steps are known as the 'back end' of the fuel cycle.Uranium is a slightly radioactive metal that occurs throughout the Earth's crust (see page on Uranium and Depleted Uranium).An increasing proportion of the world's uranium now comes from in situ leach (ISL) mining, where oxygenated groundwater is circulated through a very porous orebody to dissolve the uranium oxide and bring it to the surface.
The various activities associated with the production of electricity from nuclear reactions are referred to collectively as the nuclear fuel cycle.
The nuclear fuel cycle starts with the mining of uranium and ends with the disposal of nuclear waste.
What basic element, found in abundance on Earth, do these nuclear plants require in order to produce these huge amounts of power? Nuclear fission occurs when one atom splits into two, creating energy. Uranium undergoes spontaneous fission at a very slow rate, and emits radiation.
Uranium-235 (U-235) is only found in about 0.7 percent of uranium found naturally, but it is well-suited for producing nuclear power.
Another reason that U-235 is ideal for producing nuclear power is that unlike most materials, U-235 can undergo induced fission.
When a free neutron collides with a U-235 nucleus, the nucleus will usually capture the neutron and split extremely quickly.
It is, for example, found in concentrations of about four parts per million (ppm) in granite, which makes up 60% of the Earth's crust.
In fertilisers, uranium concentration can be as high as 400 ppm (0.04%), and some coal deposits contain uranium at concentrations greater than 100 ppm (0.01%).
The splitting of a single U-235 atom can release roughly 200 Me V (million electron volts).Tags: Adult Dating, affair dating, sex dating