Convert Roentgens to Kilocoulombs per kilogram
Convert Roentgens (R) to Kilocoulombs per kilogram (kC/kg) instantly and accurately.
Conversion Formula
kC/kg = R × 2.580000000e-7
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 Kilocoulombs per kilogram
The kilocoulomb per kilogram (kC/kg) equals 10³ C/kg ≈ 3.88 × 10⁶ R. Encountered only in extreme prompt-radiation environments such as nuclear weapon burst regions and high-power flash X-ray facility calibration; at this exposure level all air volumes are multiply ionised and conventional dosimetry models break down. 1 kC/kg = 10³ C/kg.
Quick Reference Table
| Roentgens (R) | Kilocoulombs per kilogram (kC/kg) |
|---|---|
| 1 R | 2.58 × 10-7 kC/kg |
| 2 R | 5.16 × 10-7 kC/kg |
| 5 R | 1.29 × 10-6 kC/kg |
| 10 R | 2.58 × 10-6 kC/kg |
| 25 R | 6.45 × 10-6 kC/kg |
| 50 R | 1.29 × 10-5 kC/kg |
| 100 R | 2.58 × 10-5 kC/kg |