Convert Roentgens to Microcoulombs per kilogram
Convert Roentgens (R) to Microcoulombs per kilogram (µC/kg) instantly and accurately.
Conversion Formula
µC/kg = R × 258
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.
About Microcoulombs per kilogram
The microcoulomb per kilogram (µC/kg) equals 10⁻⁶ C/kg ≈ 3.88 mR. Used in precision ionisation chamber measurements for X-ray beam quality characterisation; national standards laboratories express free-air chamber calibration factors in µC/kg. 1 µC/kg = 10⁻⁶ C/kg = 10⁻³ mC/kg.
Quick Reference Table
| Roentgens (R) | Microcoulombs per kilogram (µC/kg) |
|---|---|
| 1 R | 258 µC/kg |
| 2 R | 516 µC/kg |
| 5 R | 1290 µC/kg |
| 10 R | 2580 µC/kg |
| 25 R | 6450 µC/kg |
| 50 R | 12900 µC/kg |
| 100 R | 25800 µC/kg |