6 Colo. Code Regs. § 1007-1-5-D
The licensee or registrant shall not permit any individual to act as a radiographer's assistant unless and until the individual has:
5D.1 Received initial radiation safety training;
and
5D.2 Has provided evidence of having:
5D.2.1 Successfully completed a written examination after having received copies of and instruction in the:
(1) Requirements of Part 5;
(2) Requirements of applicable sections of Parts 4, 10 and 17;
(3) License or registration under which the radiographer will perform industrial radiography; and
(4) Licensee's or registrant's operating and emergency procedures; and
5D.2.2 Successfully completed a practical examination under the personal supervision of a radiographer which demonstrates understanding of the use of the equipment after receiving training in the:
(1) Use of the registrant's radiation machines; or
(2) Use of the licensee's radiographic exposure devices and sealed sources;
(3) Daily inspection of devices and associated equipment; and
(4) Use of radiation survey instruments; and or
5D.3 Has demonstrated to the Department an acceptable alternative to 5D.2 when the individual has appropriate training and experience in the field of ionizing radiation, and, in addition, has adequate formal training with respect to radiation protection for industrial radiography;
and
5D.4 Has provided evidence of annual refresher safety training, as defined in 5.2, at intervals not to exceed 12 months.
6 CCR 1007-1-5-D