Convert Roentgens to Microroentgens
Convert Roentgens (R) to Microroentgens (µR) instantly and accurately.
Conversion Formula
µR = R × 1000000
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 Microroentgens
The microroentgen (µR) equals 2.58 × 10⁻¹⁰ C/kg. Standard unit for very low environmental gamma dose rates in legacy US instrumentation: airborne radiological surveys over background areas report µR/h; EPA environmental monitoring network stations historically logged µR/h for outdoor gamma levels. 1 µR = 2.58 × 10⁻¹⁰ C/kg.
Quick Reference Table
| Roentgens (R) | Microroentgens (µR) |
|---|---|
| 1 R | 1000000 µR |
| 2 R | 2000000 µR |
| 5 R | 5000000 µR |
| 10 R | 10000000 µR |
| 25 R | 25000000 µR |
| 50 R | 50000000 µR |
| 100 R | 100000000 µR |