Frequent Questions

Why is the guidance being updated now?

Federal Guidance Report No. 14 is an update to the 1976 x-ray guidance in Federal Guidance Report No. 9. Since 1976, we have seen two related trends in x-ray technology:

  • Digital technology has largely replaced x-ray film. With digital technology, overexposure does not degrade the image. This is different from film where an overexposure blackens the film, making the image useless for diagnosis.
  • With the increased use of computed tomography (CT) scanning, there have been several reports of unnecessarily high radiation doses given to children because equipment exposure settings were not properly "dialed down" from adult settings.

In response to these trends and reports from the National Council on Radiation Protection and Measurements (NCRP) about the sharp increase in CT scanning among all age groups, the federal Interagency Steering Committee on Radiation Standards (ISCORS) asked EPA to consider revising Federal Guidance Report No. 9. As a result, the Interagency Working Group on Medical Radiation was formed to develop Federal Guidance Report No. 14: Radiation Protection Guidance for Diagnostic and Interventional X-Ray Procedures.

Learn more about Federal Guidance Report No. 14 and download related materials. 

Read Radiation Protection Federal Guidance technical reports. 

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