Successful completion of (a) a 1-year dental assistant program or completion of 1 year of a dental hygiene program accredited by the American Dental Associations Commission on Accreditation that included a course in radiation physics; radiation biology; radiation health, safety, and protection; X-ray films and radiographic film quality, radiographic techniques; darkroom and processing techniques; and film mounting; or (b) practical nurse training approved by the appropriate State, territory, or District of Columbia accrediting body. (2) Persons first employed by the Federal Government as radiologic personnel after the effective date of the regulation who (a) received training from institutions in a State or foreign jurisdiction that did not accredit training in that particular field at the time of graduation, or (b) practiced in a State or foreign jurisdiction that did not license that particular field or did not allow special eligibility to take a licensure examination for those who did not graduate from an accredited educational program, provided such persons show evidence of training, experience, and competence, as determined by OPM or the employing agency.