The main uranium sources are uraninite
(UO2), pitchblende (U3O8), carnonite (K(UO2)2(VO4)23H2O),
phosphate minerals and lignite (Stalder et al., 2012). Uranium
has low specific activity and as a result its chemotoxicity is of
much greater concern (Stalder et al., 2012). Independent of the
source, depleted or natural, uranium is a toxic chemical (Betti,
2003).