Milliroentgen (mR)
One thousandth of a roentgen. Survey meters often read mR/h.
What is a milliroentgen?
- Symbol
- mR
- Quantity
- Radiation Exposure
- Unit system
- other
- Definition
- One thousandth of a roentgen. Survey meters often read mR/h.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
Common on survey meter scales, usually as an exposure rate in mR per hour.
Milliroentgen in other radiation exposure units
- 1 mR = 2.58e-7 C/kgCoulomb per kilogram
- 1 mR = 0.000258 mC/kgMillicoulomb per kilogram
- 1 mR = 0.001 RRoentgen
- 1 mR = 1000 µRMicroroentgen
Milliroentgen quick reference
| Milliroentgen | Coulomb per kilogram | Roentgen | Millicoulomb per kilogram |
|---|---|---|---|
| 1 mR | = 2.58e-7 C/kg | = 0.001 R | = 0.000258 mC/kg |
| 10 mR | = 0.00000258 C/kg | = 0.01 R | = 0.00258 mC/kg |
| 100 mR | = 0.0000258 C/kg | = 0.1 R | = 0.0258 mC/kg |
| 1000 mR | = 0.000258 C/kg | = 1 R | = 0.258 mC/kg |
Where the milliroentgen fits
The next smaller radiation exposure unit is the microroentgen (µR). 1 mR = 1000 µR, and 1 µR = 0.001 mR.
The next larger radiation exposure unit is the roentgen (R). 1 mR = 0.001 R, and 1 R = 1000 mR.
Frequently asked questions
- How many coulombs per kilogram are in one milliroentgen?
- One milliroentgen = 2.58e-7 C/kg (coulombs per kilogram).
- How many roentgens are in one milliroentgen?
- One milliroentgen = 0.001 R (roentgens).
- How many millicoulombs per kilogram are in one milliroentgen?
- One milliroentgen = 0.000258 mC/kg (millicoulombs per kilogram).