UraniumNatural radioactive element with the atomic number 92. The n... in which the percentage of fissionable isotopeAtoms of the same atomic number (i.e. the same chemical elem... U-235 is increased beyond the content of 0.7205% of natural uraniumUranium in the isotope composition occurring in nature, Natu.... Various enrichmentProcess by which the share of a certain isotpe in an element... processes are possible: diffusion separation processlsotope separation procedure using the different diffusion s..., gas centrifuge processProcess to separate isotopes in which heavy atoms are split ..., nozzle separation process.