Tennessee Code Title 68. Health, Safety and Environmental Protection § 68-202-401

(1) “By-product material” means any radioactive material, except special nuclear material, yielded in or made radioactive by exposure to the radiation incident to the process of producing or utilizing special nuclear material;

(2) “Commissioner” means the commissioner of environment and conservation or the commissioner's designated representative;

(3) “Department” means the department of environment and conservation;

(4) “Person” means an individual, trust, firm, joint stock company, corporation (including a government corporation), partnership, association, state, municipality, commission, political subdivision of a state, any interstate body, any governmental agency of this state and any department, agency or instrumentality of the federal government;

(5) “Radiation” includes all ionizing electromagnetic waves and corpuscular emissions such as, but not necessarily limited to, gamma rays and X-rays; alpha and beta particles; electrons, neutrons and protons; and other nuclear particles but not radio waves or visible, infrared or ultraviolet light;

(6) “Radiation machine” means an apparatus which produces or may produce when the associated controls are operated, one (1) or more forms of radiation;

(7) “Radiation source” includes material which emits radiation spontaneously, or apparatus which produces, or may produce when the associated controls are operated, one (1) or more forms of radiation;

(8) “Radioactive material” refers to any material, solid, liquid or gas, which emits radiation spontaneously;

(10) “Special nuclear material in quantities not sufficient to form a critical mass” means uranium enriched in the isotope U-235 in quantities not exceeding three hundred fifty (350) grams of contained U-235; U-233 in quantities not exceeding two hundred (200) grams; plutonium in quantities not exceeding two hundred (200) grams; or any combination of them in accordance with the following formula: for each kind of special nuclear material, determine the ratio between the quantity of that special nuclear material and the quantity specified above for the same kind of special nuclear material. The sum of such ratios for all kinds of special nuclear material in combination shall not exceed one (1) (i.e., unity);

(11) “Specific license” means a license issued by the department which allows the use, storage, handling, and possession of radioactive sources under specified conditions of the license; and

(12) “Specific licensee” means a holder of a specific license issued by the department.