Microsievert (µSv)
One millionth of a sievert. Dosimeters and Geiger counters often show µSv or µSv/h.
What is a microsievert?
- Symbol
- µSv
- Quantity
- Radiation Dose (Equivalent)
- Unit system
- SI
- Definition
- One millionth of a sievert. Dosimeters and Geiger counters often show µSv or µSv/h.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Shown on personal dosimeters and Geiger counters, often as a rate in µSv per hour, and for small doses such as flights.
Microsievert in other radiation dose (equivalent) units
- 1 µSv = 0.000001 SvSievert
- 1 µSv = 0.001 mSvMicrosievert to Millisievert converter
- 1 µSv = 0.0001 remRem
- 1 µSv = 0.1 mremMicrosievert to Millirem converter
Microsievert quick reference
| Microsievert | Millisievert | Millirem | Sievert |
|---|---|---|---|
| 1 µSv | = 0.001 mSv | = 0.1 mrem | = 0.000001 Sv |
| 10 µSv | = 0.01 mSv | = 1 mrem | = 0.00001 Sv |
| 100 µSv | = 0.1 mSv | = 10 mrem | = 0.0001 Sv |
| 1000 µSv | = 1 mSv | = 100 mrem | = 0.001 Sv |
Where the microsievert fits
The next larger radiation dose (equivalent) unit is the millirem (mrem). 1 µSv = 0.1 mrem, and 1 mrem = 10 µSv.
Frequently asked questions
- How many millisieverts are in one microsievert?
- One microsievert = 0.001 mSv (millisieverts).
- How many millirem are in one microsievert?
- One microsievert = 0.1 mrem (millirem).
- How many sieverts are in one microsievert?
- One microsievert = 0.000001 Sv (sieverts).