Radiation Safety Office

WSU has a specific license of broad scope for use and possession of radioactive materials. We also operate under a radioactive air emissions license. In order to comply with these two licenses we must keep an up to date inventory of all radioactive materials on the WSU campus including generally licensed source material (see definition below). If your lab possesses any of this material please contact our office so we can add it to our inventory.

Rey McGehee 335-6763

WAC 246-233-010

General licenses - Source material.

(2) Persons who receive, possess, use, or transfer source material pursuant to the general license issued in subsection (1) of this section are exempt from the provisions of chapters 246-221 and 246-222 WAC to the extent that such receipt, possession, use, or transfer is within the terms of such general license: Provided, however, That this exemption shall not be deemed to apply to any such person who is also in possession of source material under a specific license issued pursuant to chapter 246-235 WAC.


WAC 246-220-01

  "Source material" means: (a) Uranium or thorium, or any combination thereof, in any physical or chemical form, or (b) ores which contain (i) uranium, (ii) thorium, or (iii) any combination thereof.

WAC 246-232-006

Exemption of certain source material.

(a) Any quantities of thorium contained in:

     (i) Incandescent gas mantles;

     (ii) Vacuum tubes;

     (iii) Welding rods;

     (iv) Electric lamps for illuminating purposes if each lamp contains fifty milligrams or less of thorium;

     (v) Germicidal lamps, sunlamps and lamps for outdoor or industrial lighting if each lamp contains two grams or less of thorium;

     (vi) Rare earth metals and compounds, mixtures, and products containing 0.25 percent or less by weight thorium, uranium, or any combination of these; or

     (vii) Personnel neutron dosimeters if each dosimeter contains 1.85 gigabecquerels (50 milligrams) or less of thorium;

     (b) Source material contained in the following products:

     (i) Glazed ceramic tableware if the glaze contains twenty percent or less by weight source material; and

     (ii) Piezoelectric ceramic containing two percent or less by weight source material;

     (c) Photographic film, negatives and prints containing uranium or thorium;

     (d) Any finished product or part fabricated of, or containing, tungsten-thorium or magnesium-thorium alloys if the thorium content of the alloy is four percent or less by weight. The exemption contained in this subparagraph shall not be deemed to authorize the chemical, physical or metallurgical treatment or processing of any such product or part;

     (e) Thorium contained in finished optical lenses if each lens contains thirty percent or less by weight of thorium. The exemption contained in this subparagraph shall not be deemed to authorize either:

     (i) The shaping, grinding or polishing of lens or manufacturing processes other than the assembly of such lens into optical systems and devices without alteration of the lens; or

     (ii) The receipt, possession, use or transfer of thorium contained in contact lenses, or in spectacles, or in eyepieces in binoculars or other optical instruments;

     (f) Uranium contained in detector heads for use in fire detection units if each detector head contains 185 becquerels (0.005 microcuries) or less of uranium; or

     (g) Thorium contained in any finished aircraft engine part containing nickel-thoria alloy if:

     (i) The thorium is dispersed in the nickel-thoria alloy in the form of finely divided thoria (thorium dioxide); and

     (ii) The thorium content in the nickel-thoria alloy is four percent or less by weight.

     (4) The exemptions in subsection (3) of this section do not authorize the manufacture of any of the products described.





Radiation Safety Office, PO Box 641302, Washington State University, Pullman WA 99164-1302, 509-335-8916, Contact Us