Here's why:
* Natural uranium: Most naturally occurring uranium is uranium-238, with only about 0.7% being uranium-235.
* Fissionability: Uranium-235 is the fissile isotope, meaning it can sustain a chain reaction. Uranium-238 is not.
* Enrichment: This process involves separating the uranium-235 from the uranium-238 to increase the percentage of uranium-235 in the fuel. This allows nuclear reactors to operate efficiently.
There are several methods of uranium enrichment, including:
* Gaseous diffusion: This method relies on the fact that uranium-235 diffuses slightly faster than uranium-238 through a porous membrane.
* Gas centrifuge: This method uses high-speed spinning cylinders to separate the isotopes based on their differing masses.
* Laser isotope separation: This method uses lasers to selectively excite and ionize uranium-235 atoms, allowing them to be separated from uranium-238.
Enrichment is a critical step in the nuclear fuel cycle, as it ensures that there is a sufficient concentration of uranium-235 to sustain a chain reaction in nuclear reactors.
