Radiology & Specialty
Radiation Exposure Converter
Ionization caused in air by X-rays and gamma rays: roentgen and coulomb per kilogram.
That is below absolute zero (−273.15 °C), which isn’t physically possible.
1 Roentgen = 0.000258 Coulombs per kilogram
Formula: multiply the radiation exposure value by 0.000258
1 R in every radiation exposure unit
Tap a row to convert to that unit.
How to convert radiation exposure units
Ionization caused in air by X-rays and gamma rays: roentgen and coulomb per kilogram. Every conversion goes through one base unit, the coulomb per kilogram, using exact factors, so results don’t drift.
Roentgens to coulombs per kilogram (R to C/kg)
To convert roentgens to coulombs per kilogram, multiply by 0.000258. 1 roentgen = 0.000258 coulombs per kilogram.
| R | C/kg |
|---|---|
| 1 R | 0.000258 C/kg |
| 2 R | 0.000516 C/kg |
| 5 R | 0.00129 C/kg |
| 10 R | 0.00258 C/kg |
| 20 R | 0.00516 C/kg |
| 50 R | 0.0129 C/kg |
| 100 R | 0.0258 C/kg |
Coulombs per kilogram to roentgens (C/kg to R)
To convert coulombs per kilogram to roentgens, divide by 0.000258. 1 coulomb per kilogram = 3,875.969 roentgens.
| C/kg | R |
|---|---|
| 1 C/kg | 3,875.969 R |
| 2 C/kg | 7,751.938 R |
| 5 C/kg | 19,379.84 R |
| 10 C/kg | 38,759.69 R |
| 20 C/kg | 77,519.38 R |
| 50 C/kg | 193,798.4 R |
| 100 C/kg | 387,596.9 R |
Milliroentgens to microcoulombs per kilogram (mR to µC/kg)
To convert milliroentgens to microcoulombs per kilogram, multiply by 0.258. 1 milliroentgen = 0.258 microcoulombs per kilogram.
Microcoulombs per kilogram to milliroentgens (µC/kg to mR)
To convert microcoulombs per kilogram to milliroentgens, divide by 0.258. 1 microcoulomb per kilogram = 3.875969 milliroentgens.