Natural uranium has approx. 0,7 % 235U; uranium with more than 0,7 % 235U is an enriched uranium.
Uranium-235 is not added to natural uranium, it is extracted from natural uranium by a process called enrichment.
Natural uranium contain 0,7204 % uranium 235.
Approx. 0,7 % uranium 235 in natural uranium.
Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium.
Isotopes Uranium 235 and uranium 238 are only natural isotopes of the element uranium.
Uranium 235 is a natural isotope of uranium. See the list of uranium mines.
Uranium 235 is approx. 0,7 % from the natural uranium; see the link below for the uranium supplies.
U-235 and U-238 are natural radioactive isotopes.
Uranium-235 and uranium-238 are two different natural, radioactive isotopes of uranium.
Uranium-235 (natural) and uranium-233 (artificial).
235U is a natural isotope of uranium; the concentration in the natural uranium is ca. 0,7 %.
Uranium 235 is obtained by the enrichment of natural uranium using separation methods as gaseous diffusion or centrifugation.