Rad (absorbed dose) (rd)
Older unit of absorbed dose: exactly 0.01 Gy. Its symbol is often written "rad" (not to be confused with the radian).
What is a rad?
- Symbol
- rd
- Quantity
- Absorbed Dose
- Unit system
- other
- Definition
- Older unit of absorbed dose: exactly 0.01 Gy. Its symbol is often written "rad" (not to be confused with the radian).
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
An older unit still used in some US practice and literature. Not to be confused with the radian, also written rad.
Rad (absorbed dose) in other absorbed dose units
- 1 rd = 0.01 GyRad (absorbed dose) to Gray converter
- 1 rd = 1 cGyCentigray
- 1 rd = 10 mGyMilligray
- 1 rd = 10000 µGyMicrogray
- 1 rd = 1000 mrdMillirad
Rad (absorbed dose) quick reference
| Rad (absorbed dose) | Gray | Centigray | Milligray |
|---|---|---|---|
| 1 rd | = 0.01 Gy | = 1 cGy | = 10 mGy |
| 10 rd | = 0.1 Gy | = 10 cGy | = 100 mGy |
| 100 rd | = 1 Gy | = 100 cGy | = 1000 mGy |
| 1000 rd | = 10 Gy | = 1000 cGy | = 10000 mGy |
Where the rad fits
The next smaller absorbed dose unit is the milligray (mGy). 1 rd = 10 mGy, and 1 mGy = 0.1 rd.
The next larger absorbed dose unit is the gray (Gy). 1 rd = 0.01 Gy, and 1 Gy = 100 rd.
Frequently asked questions
- How many grays are in one rad?
- One rad = 0.01 Gy (grays).
- How many centigrays are in one rad?
- One rad = 1 cGy (centigrays).
- How many milligrays are in one rad?
- One rad = 10 mGy (milligrays).