Convert Milliroentgens to Megaroentgens
Convert Milliroentgens (mR) to Megaroentgens (MR) instantly and accurately.
Conversion Formula
MR = mR × 1.000000000e-9
About Milliroentgens
The milliroentgen (mR) equals 2.58 × 10⁻⁷ C/kg. Standard unit in US health physics for area gamma surveys: personal dosimeters and Geiger counters in medical and industrial radiography settings display mR/h; NRC licence conditions often specify dose-rate limits in mR/h at facility boundaries. 1 mR = 2.58 × 10⁻⁷ C/kg.
About Megaroentgens
The megaroentgen (MR) equals 258 C/kg. Used only in extreme radiation environments - nuclear detonation effects calculations, prompt gamma pulse environments, and legacy radiation hardness assurance for military electronics specify total ionising exposure in MR(air); calibrated flash X-ray simulators output pulse exposures in MR. 1 MR = 258 C/kg = 10⁶ R.
Quick Reference Table
| Milliroentgens (mR) | Megaroentgens (MR) |
|---|---|
| 1 mR | 1 × 10-9 MR |
| 2 mR | 2 × 10-9 MR |
| 5 mR | 5 × 10-9 MR |
| 10 mR | 1 × 10-8 MR |
| 25 mR | 2.5 × 10-8 MR |
| 50 mR | 5 × 10-8 MR |
| 100 mR | 1 × 10-7 MR |