What is being measured?
Radiation exposure follows the stated ionization-in-air convention and is kept separate from dose and activity. No clinical effect or exposure limit is inferred.
Exposure for X/gamma radiation; not absorbed dose. Do not convert roentgens to grays as a unit conversion.
Choose a unit definition
Symbols, prefixes and conventions matter. Each row links to a definition, a worked example and a comparison table. Units of different quantities are kept separate even when symbols or dimensions look similar.
Coulombs per kilogram (C/kg)
Definition, reference values and linked conversions.
Millicoulombs per kilogram (mC/kg)
Definition, reference values and linked conversions.
Microcoulombs per kilogram (µC/kg)
Definition, reference values and linked conversions.
Roentgens (R)
Definition, reference values and linked conversions.
Milliroentgens (mR)
Definition, reference values and linked conversions.
Choose the conversion direction
Start with the unit attached to the original measurement. Select the unit needed by the receiving report, specification or formula. Conversion tools preserve the measured quantity; calculating another property can require additional measured inputs and assumptions.
Precision and common mistakes
- Keep the source and target quantity consistent. A matching symbol is not enough to establish a compatible definition.
- Record the original measurement precision. Showing twelve significant digits in a table does not make a rounded input more precise.
- Check symbol capitalization, prefixes and any regional convention in the source. Use the displayed unit definition rather than a similarly named unit.
- Factors involving repeating fractions or π use finite numerical precision. Round the final answer to the precision justified by your input.
Unit reference only. These pages do not assess biological effects, clinical use, exposure limits or radiation safety. Absorbed dose, equivalent dose, activity and exposure remain different quantities; unit scaling cannot convert one into another.
Use a working converter
- Photon radiation exposure converter
- Coulombs per kilogram to Millicoulombs per kilogram converter
- Millicoulombs per kilogram to Coulombs per kilogram converter
- Coulombs per kilogram to Microcoulombs per kilogram converter
- Microcoulombs per kilogram to Coulombs per kilogram converter
- Coulombs per kilogram to Roentgens converter
Source and verification scope
Examples and tables are computed from the versioned unit definitions used by the linked converters. The source access dates appear below. Computandum is independent of the cited organizations; a citation does not mean that a publisher endorses this page or an actual project.