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X-ray and Mammography Certification

The inspectors are private individuals, approved by the Department to inspect x-ray machines. They may charge what they want for their services. Please contact the X-ray Program at 303-692-3448 to request a faxed copy of the list of approved Qualified Inspectors in Colorado or to get the telephone number of the Qualified Inspector who performed the last inspection in your office. 



Colorado is not a licensure state. However, Colorado does require that all operators of human-use diagnostic x-ray machines be ARRT(R) certified, or have taken the Colorado Limited Scope Operator's examination. Bone density equipment operators must provide the Department with proof of Limited Scope Operator certification in addition to ARRT(BD) or International Society of Clinical Densitometry (ISCD) certification. The minimum requirements for Computerized Tomography machine operators can be found in Part 2, Appendix 2E of the Colorado Rules and Regulations Pertaining to Radiation Control.


Dental, chiropractic and veterinary operators are regulated by their respective Colorado Department of Regulatory Agencies Board.


Industrial-use x-ray machine operators are regulated by the Department and the requirements are set forth in Parts 5, 8 and 9 of the Regulations.


You need to contact a Qualified Expert to do a shielding design for you. You will give this to your contractor to incorporate in the construction. While it is not required, it might be a good idea to talk with the Qualified Expert about your specific electrical needs for your equipment. You would give this to your contractor also. This might prevent problems later on, during the installation phase of your x-ray equipment. 



Anytime a machine is moved, it could affect the radiation output. It must be inspected within 90 days. The machine may be used on patients during the 90 day time interval. The exception is the mammography machine, which must be inspected before it is used on patients.








As of May 30, 2005, all Limited Scope Operators will be required to register with the Department and provide the Department with proof of twenty-four (24) Continuing Education Units of credit. You may register by printing Form R-90, completing and attaching proof of Continuing Education Units. The Department will respond by mail and provide you with a Registration Card indicating when the Limited Scope Operator's certification expires with the Department.



Please call the X-ray Program at (303) 692-3427 and advise the Department. At that time, we will investigate the situation, contact the facility and operator to review proper credentials and, if necessary, speak with the Qualified Inspector who has inspected the machines and facility at that location. We will take those steps necessary to protect the general public and the operators from undue exposure to ionizing radiation.


MRI does not use ionizing radiation, therefore it is not regulated by the Department.



Please seePart 2 of the Regulations, Appendix B. You may obtain an application, Form R-53, from the Department.


Qualified Inspector/Registered Medical Physicist pdf file     

Instructions pdf file   



Idaho State University has information for radiation safety officers on their website Understanding Radiation: The RSO Toolbox at www.physics.isu.edu/radinf/rsotoolbox.htm



Licensees and registrants must maintain exposures so that the total effective dose equivalent to individual members of the public from the licensed or registered operation does not exceed 1 milliSievert in a year; and the dose in any unrestricted area from external sources does not exceed 0.02 milliSievert in any one hour. (See RH 4.14 and 4.15 of the Regulations.) Compliance can be demonstrated by surveys and/or calculations. The Division has guidance available for downloading,  How Do I Determine Compliance With Public Dose Requirements pdf file  , to assist in the evaluation of public doses.