Each centrifuge separates U-235 from U-238
in a specific level, Bayat said, adding the percent of the U-235 increases gradually from the one centrifuge to next in the cascade (some hundred of centrifuges are chained together in each cascade).
The first line of the table below shows 1,000 atoms of natural uranium split between 7 atoms of U-235 and 993 atoms of U-238
Ra-226 Station Bq/kg Bq/kg 1 (soil) 96.
Due to the advanced types of reactors proposed for building under this program, the overall amount of fuel available for consumption actually increases with each cyclical iteration, due to the transmutation of U-238
into burnable Pu-239 in the reactor core (DOE, 2007.
Natural uranium is almost entirely made up of two isotopes, U-238
Ninety-nine percent of uranium is the unexciting U-238
Unfortunately, U-235 is far less common in uranium ore than the more stable isotope U-238
, and "enriching" uranium to increase the percentage of U-235 is messy and expensive.
There have been around 180 cases of terrorists trying to smuggle radioactive material since 1993, most of it depleted uranium, known as U-238
Of the 175 cases of nuclear materials trafficking reported by the International Atomic Energy Agency (IAEA) between 1993 and 2001, only 17 involved U-238
Eventually he introduced the Gilbert U-238
Atomic Energy Lab, whose package promised: "Thrilling to watch
When U-235 (the isotope used to make bombs) is extracted from uranium ore, what remains is U-238
, uranium that has been "depleted" of its powerfully radioactive component.
To get rid of its vast stockpile of depleted uranium (the U-238
residue of its nuclear weapons program), the United States has shipped secret cargoes of depleted uranium on air freighters.