Convert Roentgens to Picocoulombs per kilogram
Convert Roentgens (R) to Picocoulombs per kilogram (pC/kg) instantly and accurately.
Conversion Formula
pC/kg = R × 258000000
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 Picocoulombs per kilogram
The picocoulomb per kilogram (pC/kg) equals 10⁻¹² C/kg. Environmental gamma exposure rates in very low background areas approach pC/kg/h; precision ionisation chamber calibration laboratories measure leakage and secondary ionisation currents in terms of pC/kg. 1 pC/kg = 10⁻¹² C/kg = 10⁻³ nC/kg.
Quick Reference Table
| Roentgens (R) | Picocoulombs per kilogram (pC/kg) |
|---|---|
| 1 R | 258000000 pC/kg |
| 2 R | 516000000 pC/kg |
| 5 R | 1.29 × 109 pC/kg |
| 10 R | 2.58 × 109 pC/kg |
| 25 R | 6.45 × 109 pC/kg |
| 50 R | 1.29 × 1010 pC/kg |
| 100 R | 2.58 × 1010 pC/kg |