(1) Except as otherwise specifically provided, this chapter applies to all persons who receive, possess, use, transfer, own or acquire any source of radiation; provided, however, that nothing in these rules shall apply to any person to the extent such person is subject to regulation by the United States nuclear regulatory commission. Regulation by Montana of source material, byproduct material, and special nuclear material in quantities not sufficient to form a critical mass is subject to the provisions of the agreement between Montana and the United States nuclear regulatory commission and to 10 CFR Part 150 of its regulations.