(g) This Part does not apply to the following categories of U.S. Department of Energy or U.S. Nuclear Regulatory Commission contractor or subcontractor to the extent that such contractor or subcontractor receives, possesses, uses, transfers, or acquires sources of radiation under contract:

1. (1) prime contractors performing work for the U.S. Department of Energy at U.S. Government-owned or -controlled sites, including transportation of sources of radiation to or from such sites and the performance of contract services during temporary interruptions of such transportation;
2. (2) prime contractors of the U.S. Department of Energy performing research in, or development, manufacture, storage, testing, or transportation of, atomic weapons or components thereof;
3. (3) prime contractors of the U.S. Department of Energy using or operating nuclear reactors or other nuclear devices in a U.S. Government-owned vehicle or vessel; and

4. (4) any other prime contractor or subcontractor of the U.S. Department of Energy or of the U.S. Nuclear Regulatory Commission when the State and the U.S. Nuclear Regulatory Commission jointly determine:

   1. (i) that the exemption of the prime contractor or subcontractor is authorized by law; and
   2. (ii) that, under the terms of the contract or subcontract, there is adequate assurance that the work thereunder can be accomplished without undue risk to public health and safety or the environment.

(i) This Part does not apply to persons who dispose of or release the following radioactive materials:

1. (1) intact smoke detectors containing Am-241 sources manufactured and distributed in accordance with a radioactive material license; or
2. (2) household solid waste containing excreted residues of radiopharmaceuticals that were administered to an individual in accordance with a radioactive material license.