10 CFR 73.6 - Exemptions for certain quantities and kinds of special nuclear material.
(a) Uranium-235 contained in uranium enriched to less than 20 percent in the U-235 isotope.
(b) Special nuclear material which is not readily separable from other radioactive material and which has a total external radiation level in excess of 1 Gray (100 Rad) per hour at a distance of 1 meter (3.3 feet) from any accessible surface without intervening shielding.
(c) Special nuclear material in a quantity not exceeding 350 grams of uranium-235, uranium-233, plutonium, or a combination thereof, possessed in any analytical, research, quality control, metallurgical or electronic laboratory.
(e) Special nuclear material at non-power reactors.