Radiation Exposure Converter
Convert between 6 radiation exposure units instantly. Enter a value, pick your units and get the result with the formula, a full conversion table and worked examples.
100 mR in all radiation exposure units
Updates live as you type. Click a row to set it as the target unit.
| Unit | Symbol | Value |
|---|---|---|
| Microroentgen | µR | 100,000 |
| Milliroentgen | mR | 100 |
| Microcoulomb per kilogram | µC/kg | 25.8 |
| Roentgen | R | 0.1 |
| Millicoulomb per kilogram | mC/kg | 0.0258 |
| Coulomb per kilogram | C/kg | 0.0000258 |
How to Convert Radiation Exposure Units
Exposure measures the ionisation produced in air by X rays or gamma rays. The SI unit is coulomb per kilogram (C/kg); the roentgen (R) equals exactly 2.58 × 10⁻⁴ C/kg.
Every unit on this page is stored as a fixed factor relative to one reference unit, the coulomb per kilogram (C/kg). Converting is a two step multiply and divide:
- Multiply your value by the factor of the source unit to get the value in C/kg.
- Divide that result by the factor of the target unit.
Milliroentgen to Microcoulomb per kilogram conversion table
| Milliroentgen (mR) | Microcoulomb per kilogram (µC/kg) |
|---|---|
| 1 mR | 0.258 µC/kg |
| 2 mR | 0.516 µC/kg |
| 3 mR | 0.774 µC/kg |
| 4 mR | 1.032 µC/kg |
| 5 mR | 1.29 µC/kg |
| 6 mR | 1.548 µC/kg |
| 7 mR | 1.806 µC/kg |
| 8 mR | 2.064 µC/kg |
| 9 mR | 2.322 µC/kg |
| 10 mR | 2.58 µC/kg |
| 15 mR | 3.87 µC/kg |
| 20 mR | 5.16 µC/kg |
| 25 mR | 6.45 µC/kg |
| 30 mR | 7.74 µC/kg |
| 40 mR | 10.32 µC/kg |
| 50 mR | 12.9 µC/kg |
| 75 mR | 19.35 µC/kg |
| 100 mR | 25.8 µC/kg |
| 250 mR | 64.5 µC/kg |
| 500 mR | 129 µC/kg |
| 1,000 mR | 258 µC/kg |
Radiation Exposure Units and Conversion Factors
Value of one unit expressed in C/kg.
| Unit | Symbol | In C/kg |
|---|---|---|
| Microroentgen | µR | 2.58 × 10−10 |
| Milliroentgen | mR | 2.58 × 10−7 |
| Microcoulomb per kilogram | µC/kg | 0.000001 |
| Roentgen | R | 0.000258 |
| Millicoulomb per kilogram | mC/kg | 0.001 |
| Coulomb per kilogram | C/kg | 1 |
Frequently Asked Questions
What is the SI unit of radiation exposure?
The SI unit of radiation exposure is the coulomb per kilogram (C/kg). Exposure measures the ionisation produced in air by X rays or gamma rays.
How do I convert roentgen to C/kg?
To convert roentgen (R) to coulomb per kilogram (C/kg), multiply the value in roentgen by 0.000258. For example, 1 R = 0.000258 C/kg.
How do I convert mR to µC/kg?
To convert milliroentgen (mR) to microcoulomb per kilogram (µC/kg), multiply the value in mR by 0.258. For example, 1 mR = 0.258 µC/kg.
How do I convert C/kg to roentgen?
To convert coulomb per kilogram (C/kg) to roentgen (R), multiply the value in C/kg by 3,875.97. For example, 1 C/kg = 3,875.97 R.
Can I see a value in every radiation exposure unit at once?
Yes. Enter a value and choose the source unit; the "all units" table below the converter instantly lists the equivalent in all 6 supported units. Click any row to make it the target unit.
More Radiology Converters
Popular Engineering Converters
Frequently used tools from our full library of 76 unit converters.