Centigray (cGy)
One hundredth of a gray, the same as one rad. Used in radiotherapy planning.
What is a centigray?
- Symbol
- cGy
- Quantity
- Absorbed Dose
- Unit system
- SI
- Definition
- One hundredth of a gray, the same as one rad. Used in radiotherapy planning.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used in radiotherapy treatment planning, where it replaced the rad with the same numerical value.
Centigray in other absorbed dose units
- 1 cGy = 0.01 GyCentigray to Gray converter
- 1 cGy = 10 mGyMilligray
- 1 cGy = 10000 µGyMicrogray
- 1 cGy = 1 rdRad (absorbed dose)
- 1 cGy = 1000 mrdMillirad
Centigray quick reference
| Centigray | Gray | Rad (absorbed dose) | Milligray |
|---|---|---|---|
| 1 cGy | = 0.01 Gy | = 1 rd | = 10 mGy |
| 10 cGy | = 0.1 Gy | = 10 rd | = 100 mGy |
| 100 cGy | = 1 Gy | = 100 rd | = 1000 mGy |
| 1000 cGy | = 10 Gy | = 1000 rd | = 10000 mGy |
Where the centigray fits
The next smaller absorbed dose unit is the milligray (mGy). 1 cGy = 10 mGy, and 1 mGy = 0.1 cGy.
The next larger absorbed dose unit is the gray (Gy). 1 cGy = 0.01 Gy, and 1 Gy = 100 cGy.
Frequently asked questions
- How many grays are in one centigray?
- One centigray = 0.01 Gy (grays).
- How many rads are in one centigray?
- One centigray = 1 rd (rads).
- How many milligrays are in one centigray?
- One centigray = 10 mGy (milligrays).