Millisievert (mSv)
One thousandth of a sievert. Natural background radiation is a few mSv per year.
What is a millisievert?
- Symbol
- mSv
- Quantity
- Radiation Dose (Equivalent)
- Unit system
- SI
- Definition
- One thousandth of a sievert. Natural background radiation is a few mSv per year.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for annual background radiation, medical imaging doses and occupational dose records.
Millisievert in other radiation dose (equivalent) units
- 1 mSv = 0.001 SvSievert
- 1 mSv = 1000 µSvMillisievert to Microsievert converter
- 1 mSv = 0.1 remRem
- 1 mSv = 100 mremMillisievert to Millirem converter
Millisievert quick reference
| Millisievert | Microsievert | Millirem | Sievert |
|---|---|---|---|
| 1 mSv | = 1000 µSv | = 100 mrem | = 0.001 Sv |
| 10 mSv | = 10000 µSv | = 1000 mrem | = 0.01 Sv |
| 100 mSv | = 100000 µSv | = 10000 mrem | = 0.1 Sv |
| 1000 mSv | = 1000000 µSv | = 100000 mrem | = 1 Sv |
Where the millisievert fits
The next smaller radiation dose (equivalent) unit is the millirem (mrem). 1 mSv = 100 mrem, and 1 mrem = 0.01 mSv.
The next larger radiation dose (equivalent) unit is the rem (rem). 1 mSv = 0.1 rem, and 1 rem = 10 mSv.
Frequently asked questions
- How many microsieverts are in one millisievert?
- One millisievert = 1000 µSv (microsieverts).
- How many millirem are in one millisievert?
- One millisievert = 100 mrem (millirem).
- How many sieverts are in one millisievert?
- One millisievert = 0.001 Sv (sieverts).