Radiation Exposure Converter
Radiation exposure measures how strongly X-rays or gamma rays ionise air, which is what an ion-chamber instrument actually reads. The SI unit is the coulomb per kilogram; the older roentgen, defined as exactly 2.58 × 10⁻⁴ C/kg, still appears on legacy survey meters.
8 units supported Base unit coulomb per kilogram (C/kg)
Multiply the number of coulombs per kilogram by 3875.96899225 to get roentgens. How this is calculated
About radiation exposure conversion
Radiation Exposure conversion is commonly needed when X-ray equipment testing, ion-chamber readings, and legacy dose records. Exposure measures ionisation in air, not energy absorbed in tissue — that is absorbed dose, measured in grays.
Convert Coulomb per Kilogram to other radiation exposure units
1 C/kg expressed in every other radiation exposure unit on this site.
- Coulomb per Kilogram C/kg 1
- Millicoulomb per Kilogram mC/kg 1,000
- Microcoulomb per Kilogram µC/kg 1,000,000
- Roentgen R 3,875.969
- Milliroentgen mR 3,875,969
- Tissue Roentgen R (tissue) 3,875.969
- Parker parker 3,875.969
- Rep rep 3,875.969
Complete list of radiation exposure units
All 8 units this converter supports, each stated against the coulomb per kilogram (C/kg).
| Unit | Symbol | System | In coulombs per kilogram | Conversions |
|---|---|---|---|---|
| Coulomb per Kilogram | C/kg | SI | base unit (C/kg) | — |
| Millicoulomb per Kilogram | mC/kg | SI | 1 mC/kg = 0.001 C/kg | — |
| Microcoulomb per Kilogram | µC/kg | SI | 1 µC/kg = 0.000001 C/kg | — |
| Roentgen | R | Other | 1 R = 0.000258 C/kg | — |
| Milliroentgen | mR | Other | 1 mR = 2.58e-7 C/kg | — |
| Tissue Roentgen | R (tissue) | Other | 1 R (tissue) = 0.000258 C/kg | — |
| Parker | parker | Other | 1 parker = 0.000258 C/kg | — |
| Rep | rep | Other | 1 rep = 0.000258 C/kg | — |
No unit in this category matches that search.
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Frequently asked questions
What is the base unit for radiation exposure?
Radiation Exposure conversions on this site are calculated against the coulomb per kilogram (C/kg).
Which radiation exposure units can I convert?
You can convert between 8 units, including coulomb per kilogram, millicoulomb per kilogram, microcoulomb per kilogram, roentgen, and more.
Where is radiation exposure conversion useful?
It is commonly needed when X-ray equipment testing, ion-chamber readings, and legacy dose records.
Does this converter mix measurement systems?
The converter supports SI, Other units and keeps their exact definitions separate so results stay accurate.
Related categories
Conversion factors are based on internationally agreed unit definitions. See our methodology and sources for details on how these values are verified.