California Code, Health and Safety Code - HSC § 106975

(a) Licentiates of the healing arts.

(b) Students in an approved school for radiologic technologists and in schools of medicine, podiatry or chiropractic when the students are operating X-ray machines under the supervision of an instructor who is a certified radiologic technologist or a certified supervisor or operator; and students of dentistry, dental hygiene and dental assisting when the students are operating X-ray machines under the supervision of an instructor who is a licensed dentist.

(c) Any person employed by an agency of the government of the United States while performing the duties of employment.

(d) Persons temporarily exempted pursuant to Section 107020.

(e) A licensed dentist; or person who, under the supervision of a licensed dentist, operates only dental radiographic equipment for the sole purpose of oral radiography. This exemption applies only to those persons who have complied with the requirements of Section 1656 of the Business and Professions Code.

(f) A person who has been certified or granted a limited permit pursuant to subdivision (b) or (c) of Section 114870 and who performs dental radiography in a dental X-ray laboratory upon the written order of a licensed dentist.