Microroentgen (µR)
One millionth of a roentgen.
What is a microroentgen?
- Symbol
- µR
- Quantity
- Radiation Exposure
- Unit system
- other
- Definition
- One millionth of a roentgen.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
Used for background radiation readings on sensitive survey meters and some Geiger counters, often as µR per hour.
Microroentgen in other radiation exposure units
- 1 µR = 2.58e-10 C/kgCoulomb per kilogram
- 1 µR = 2.58e-7 mC/kgMillicoulomb per kilogram
- 1 µR = 0.000001 RRoentgen
- 1 µR = 0.001 mRMilliroentgen
Microroentgen quick reference
| Microroentgen | Coulomb per kilogram | Roentgen | Millicoulomb per kilogram |
|---|---|---|---|
| 1 µR | = 2.58e-10 C/kg | = 0.000001 R | = 2.58e-7 mC/kg |
| 10 µR | = 2.58e-9 C/kg | = 0.00001 R | = 0.00000258 mC/kg |
| 100 µR | = 2.58e-8 C/kg | = 0.0001 R | = 0.0000258 mC/kg |
| 1000 µR | = 2.58e-7 C/kg | = 0.001 R | = 0.000258 mC/kg |
Where the microroentgen fits
The next larger radiation exposure unit is the milliroentgen (mR). 1 µR = 0.001 mR, and 1 mR = 1000 µR.
Frequently asked questions
- How many coulombs per kilogram are in one microroentgen?
- One microroentgen = 2.58e-10 C/kg (coulombs per kilogram).
- How many roentgens are in one microroentgen?
- One microroentgen = 0.000001 R (roentgens).
- How many millicoulombs per kilogram are in one microroentgen?
- One microroentgen = 2.58e-7 mC/kg (millicoulombs per kilogram).