Source material is any substance containing the following unless the Minister gives an exemption for insignificant quantities (as determined by the Minister and on specific applications)

(a)        uranium, expressed as a conversion to uranium oxide (U308) ;

(b)        thorium, expressed as a conversion to thorium oxide (Th02) ;

(c)        uranium by products of enrichment processes, e.g enriched in isotope U-238 or depleted in the isotope U-235;

(d)        uranium containing the mixture of isotopes occurring in nature.