Microgray (µGy)
One millionth of a gray.
What is a microgray?
- Symbol
- µGy
- Quantity
- Absorbed Dose
- Unit system
- SI
- Definition
- One millionth of a gray.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for small doses, such as those from dental X-rays or measured in environmental monitoring.
Microgray in other absorbed dose units
- 1 µGy = 0.000001 GyGray
- 1 µGy = 0.0001 cGyCentigray
- 1 µGy = 0.001 mGyMilligray
- 1 µGy = 0.0001 rdRad (absorbed dose)
- 1 µGy = 0.1 mrdMillirad
Microgray quick reference
| Microgray | Gray | Rad (absorbed dose) | Centigray |
|---|---|---|---|
| 1 µGy | = 0.000001 Gy | = 0.0001 rd | = 0.0001 cGy |
| 10 µGy | = 0.00001 Gy | = 0.001 rd | = 0.001 cGy |
| 100 µGy | = 0.0001 Gy | = 0.01 rd | = 0.01 cGy |
| 1000 µGy | = 0.001 Gy | = 0.1 rd | = 0.1 cGy |
Where the microgray fits
The next larger absorbed dose unit is the millirad (mrd). 1 µGy = 0.1 mrd, and 1 mrd = 10 µGy.
Frequently asked questions
- How many grays are in one microgray?
- One microgray = 0.000001 Gy (grays).
- How many rads are in one microgray?
- One microgray = 0.0001 rd (rads).
- How many centigrays are in one microgray?
- One microgray = 0.0001 cGy (centigrays).