You will need this accreditation if you intend to act as a consulting radiation expert (CRE). CREs assess diagnostic imaging apparatus (x-ray) and fixed radiation gauges.
Depending on your qualifications and the conditions of accreditation, you may be accredited to assess mammography, general diagnostic or dental apparatus. General diagnostic imaging accreditation includes medical, veterinary and chiropractic radiography, fluoroscopy, and computed tomography and bone mineral densitometry.