Radiation Exposure Converter
Convert radiation exposure between röntgen (R), milliroentgen (mR), and coulombs per kilogram (C/kg). Exposure measures ionization of air by X-rays and gamma rays.
Common Radiation Exposure Conversions
| From | To |
|---|---|
| 1 R | 2.58×10⁻⁴ C/kg |
| 1 C/kg | 3,876 R |
| 1 mR | 0.001 R |
| Background radiation (annual) | ~0.3 R = 3 mSv |
| Chest X-ray | ~0.01 mSv |
Radiation Exposure Unit Definitions
- Röntgen (R)
- Historical unit of X-ray and gamma exposure.
- Coulomb/kg (C/kg)
- SI unit of radiation exposure.
- Milliroentgen (mR)
- 0.001 R.
Frequently Asked Questions
What is a safe level of radiation exposure?
Natural background radiation averages ~3 mSv/year (300 mR). Medical guidelines limit occupational exposure to 50 mSv/year.
What is the difference between röntgen and sievert?
Röntgen (R) measures ionization in air from X/gamma rays. Sievert (Sv) measures biological effect on tissue. 1 R ≈ 0.0096 Gy ≈ 0.0096 Sv for X-rays.
How much radiation does a chest X-ray give?
A chest X-ray delivers approximately 0.1 mSv — about the same as 10 days of natural background radiation.