Convert Microroentgens to Roentgens
Convert Microroentgens (µR) to Roentgens (R) instantly and accurately.
Conversion Formula
R = µR × 1.000000000e-6
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.
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.
Quick Reference Table
| Microroentgens (µR) | Roentgens (R) |
|---|---|
| 1 µR | 1 × 10-6 R |
| 2 µR | 2 × 10-6 R |
| 5 µR | 5 × 10-6 R |
| 10 µR | 1 × 10-5 R |
| 25 µR | 2.5 × 10-5 R |
| 50 µR | 5 × 10-5 R |
| 100 µR | 1 × 10-4 R |