Milligray (mGy)
One thousandth of a gray. Diagnostic imaging doses are given in mGy.
What is a milligray?
- Symbol
- mGy
- Quantity
- Absorbed Dose
- Unit system
- SI
- Definition
- One thousandth of a gray. Diagnostic imaging doses are given in mGy.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for doses from medical imaging such as CT scans and mammography, and in dosimetry reports.
Milligray in other absorbed dose units
- 1 mGy = 0.001 GyGray
- 1 mGy = 0.1 cGyCentigray
- 1 mGy = 1000 µGyMicrogray
- 1 mGy = 0.1 rdRad (absorbed dose)
- 1 mGy = 100 mrdMillirad
Milligray quick reference
| Milligray | Gray | Rad (absorbed dose) | Centigray |
|---|---|---|---|
| 1 mGy | = 0.001 Gy | = 0.1 rd | = 0.1 cGy |
| 10 mGy | = 0.01 Gy | = 1 rd | = 1 cGy |
| 100 mGy | = 0.1 Gy | = 10 rd | = 10 cGy |
| 1000 mGy | = 1 Gy | = 100 rd | = 100 cGy |
Where the milligray fits
The next smaller absorbed dose unit is the millirad (mrd). 1 mGy = 100 mrd, and 1 mrd = 0.01 mGy.
The next larger absorbed dose unit is the centigray (cGy). 1 mGy = 0.1 cGy, and 1 cGy = 10 mGy.
Frequently asked questions
- How many grays are in one milligray?
- One milligray = 0.001 Gy (grays).
- How many rads are in one milligray?
- One milligray = 0.1 rd (rads).
- How many centigrays are in one milligray?
- One milligray = 0.1 cGy (centigrays).