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Roentgen

Dr Yuranga Weerakkody and Dr Usman Bashir et al.

Roentgen is the unit used to measure radiation exposure. It is defined as the quantity of x rays that produces 2.580 × 10−4 C of charge collected per unit mass (kilograms) of air at standard temperature and pressure (STP): 1 R = 0.000258 C/kg air.

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References

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1. Mcnitt-gray MF. AAPM/RSNA Physics Tutorial for Residents: Topics in CT. Radiation dose in CT. Radiographics. 22 (6): 1541-53. Radiographics (citation) - Pubmed citation