Nothing in section 14 or section 15 of the Act, or in these regulations, shall apply to—
(a) any irradiating apparatus that does not contain a radioactive material, other than a radioactive material exempted by regulation 4, and in which there is no electric potential difference exceeding 5 kilovolts:
(b) any television receiver or other high-voltage vacuum-tube visual display device that does not produce externally a dose equivalent rate exceeding 5 microsieverts per hour while operating.