Convert Megaroentgens to Roentgens
Convert Megaroentgens (MR) to Roentgens (R) instantly and accurately.
Conversion Formula
R = MR × 1000000
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.
About Roentgens
The roentgen (R) equals exactly 2.58 × 10⁻⁴ C/kg, the historical unit of X-ray and gamma-ray exposure defined in 1928 (ICRU) and redefined exactly in 1962. Still widely used in the US: field survey instruments read in R/h; NRC and EPA regulations cite R and mR; the Chernobyl accounts famously reported readings in R/h. 1 R = 2.58 × 10⁻⁴ C/kg.
Quick Reference Table
| Megaroentgens (MR) | Roentgens (R) |
|---|---|
| 1 MR | 1000000 R |
| 2 MR | 2000000 R |
| 5 MR | 5000000 R |
| 10 MR | 10000000 R |
| 25 MR | 25000000 R |
| 50 MR | 50000000 R |
| 100 MR | 100000000 R |