DHS 157.09(1)(a)(a) A person is exempt from subchs. III and X if the person receives, possesses, uses, owns or transfers any of the following types and forms of source material: DHS 157.09(1)(a)1.1. Any chemical mixture, compound, solution or alloy in which the source material by weight is less than 1/20 of one percent of the mixture, compound, solution or alloy. DHS 157.09(1)(a)2.2. Unrefined and unprocessed ore containing source material provided that, except as authorized in a specific license, the person does not refine or process the ore. DHS 157.09(1)(a)3.3. Rare earth metals and compounds, mixtures and products containing not more than 0.25% by weight thorium, uranium or any combination of these. DHS 157.09(1)(a)4.d.d. Electric lamps for illuminating purposes provided that a lamp does not contain more than 50 milligrams of thorium. DHS 157.09(1)(a)4.e.e. Germicidal lamps, sunlamps and lamps for outdoor or industrial lighting provided that a lamp does not contain more than 2 grams of thorium. DHS 157.09(1)(a)4.f.f. Personnel neutron dosimeters, provided that a dosimeter does not contain more than 50 milligrams of thorium. DHS 157.09(1)(a)5.a.a. Glazed ceramic tableware manufactured before August 27, 2013, provided that the glaze contains not more than 20% by weight source material. DHS 157.09(1)(a)5.b.b. Glassware containing not more than 2% by weight source material, or for glassware manufactured before August 27, 2013, 10% by weight source material; but not including commercially manufactured glass brick, pane glass, ceramic tile, or other glass or ceramic used in construction. DHS 157.09(1)(a)5.c.c. Glass enamel or glass enamel frit containing not more than 10% by weight source material imported or ordered for importation into the United States or initially distributed by manufacturers in the United States, before July 25, 1983. DHS 157.09(1)(a)6.6. Photographic film, negatives and prints containing uranium or thorium. DHS 157.09(1)(a)7.7. Any finished product or part fabricated of tungsten-thorium or magnesium-thorium alloys, or containing tungsten-thorium or magnesium-thorium alloys, provided that the thorium content of the alloy does not exceed 4% by weight and that this exemption is not deemed to authorize the chemical, physical or metallurgical treatment or processing of any product or part. DHS 157.09(1)(a)8.8. Uranium contained in counterweights installed in aircraft, rockets, projectiles or missiles or stored or handled in connection with installation or removal of the counterweights, under all of the following conditions: DHS 157.09(1)(a)8.a.a. Each counterweight has been impressed with the following legend clearly legible through any plating or other covering: “DEPLETED URANIUM”. This requirement need not be met by counterweights manufactured prior to December 31, 1969 provided that the counterweights are impressed with the legend “CAUTION — RADIOACTIVE MATERIAL — URANIUM”. DHS 157.09(1)(a)8.b.b. Each counterweight is durably and legibly labeled or marked with the identification of the manufacturer and the statement, “UNAUTHORIZED ALTERATIONS PROHIBITED”. This requirement need not be met by counterweights manufactured prior to December 31, 1969 provided that the counterweights are impressed with the legend “CAUTION — RADIOACTIVE MATERIAL — URANIUM”. DHS 157.09(1)(a)8.c.c. This exemption may not be deemed to authorize the chemical, physical or metallurgical treatment or processing of any of these counterweights other than repair or restoration of any plating or other covering. DHS 157.09(1)(a)9.9. Natural or depleted uranium metal used as shielding constituting part of any shipping container, provided that the shipping container is conspicuously and legibly impressed with the legend “CAUTION — RADIOACTIVE SHIELDING — URANIUM”; and the uranium metal is encased in mild steel or equally fire resistant metal of minimum wall thickness of 3.2 millimeter (one-eighth inch). DHS 157.09(1)(a)10.10. Thorium or uranium contained in or on finished optical lenses and mirrors, provided that a lens or mirror does not contain more than10% by weight of thorium or uranium or for lenses manufactured before August 27, 2013, 30% by weight of thorium and that this exemption is not deemed to authorize either of the following: DHS 157.09(1)(a)10.a.a. The shaping, grinding or polishing of the lens or manufacturing processes other than the assembly of the lens into optical systems and devices without any alteration of the lens. DHS 157.09(1)(a)10.b.b. The receipt, possession, use or transfer of thorium contained in contact lenses, spectacles, eyepieces in binoculars or other optical instruments. DHS 157.09(1)(a)11.11. Thorium contained in any finished aircraft engine part containing nickel-thoria alloy, provided that the thorium is dispersed in the alloy in the form of finely divided thoria, and the thorium content in the nickel-thoria alloy does not exceed 4% by weight.