Convert Roentgens to Kiloroentgens
Convert Roentgens (R) to Kiloroentgens (kR) instantly and accurately.
Conversion Formula
kR = R × 0.001
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 Kiloroentgens
The kiloroentgen (kR) equals 0.258 C/kg. Used in radiation hardness testing of electronics and legacy nuclear weapons effects literature; total ionising exposure inside nuclear facilities during design-basis accident scenarios is cited in kR; some older radiation therapy machine output specifications use kR/min. 1 kR = 0.258 C/kg = 10³ R.
Quick Reference Table
| Roentgens (R) | Kiloroentgens (kR) |
|---|---|
| 1 R | 0.001 kR |
| 2 R | 0.002 kR |
| 5 R | 0.005 kR |
| 10 R | 0.01 kR |
| 25 R | 0.025 kR |
| 50 R | 0.05 kR |
| 100 R | 0.1 kR |