1. Plural of milliroentgen; units of ionizing radiation exposure equal to one thousandth of a roentgen.
Usage: technical; physics/radiology; often abbreviated as mR

Examples

• The patient received a dose of 50 milliroentgens during the X-ray procedure.
• Radiation safety standards limit worker exposure to a certain number of milliroentgens per year.
• The detector measured background radiation at approximately 10 milliroentgens per hour.
• Historical nuclear tests exposed nearby populations to thousands of milliroentgens.
• Modern medical imaging equipment is designed to minimize patient exposure to milliroentgens.