Millirad (mrd)
One thousandth of a rad: exactly 10 µGy.
What is a millirad?
- Symbol
- mrd
- Quantity
- Absorbed Dose
- Unit system
- other
- Definition
- One thousandth of a rad: exactly 10 µGy.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
Found in older US dosimetry records and literature for small absorbed doses.
Millirad in other absorbed dose units
- 1 mrd = 0.00001 GyGray
- 1 mrd = 0.001 cGyCentigray
- 1 mrd = 0.01 mGyMilligray
- 1 mrd = 10 µGyMicrogray
- 1 mrd = 0.001 rdRad (absorbed dose)
Millirad quick reference
| Millirad | Gray | Rad (absorbed dose) | Centigray |
|---|---|---|---|
| 1 mrd | = 0.00001 Gy | = 0.001 rd | = 0.001 cGy |
| 10 mrd | = 0.0001 Gy | = 0.01 rd | = 0.01 cGy |
| 100 mrd | = 0.001 Gy | = 0.1 rd | = 0.1 cGy |
| 1000 mrd | = 0.01 Gy | = 1 rd | = 1 cGy |
Where the millirad fits
The next smaller absorbed dose unit is the microgray (µGy). 1 mrd = 10 µGy, and 1 µGy = 0.1 mrd.
The next larger absorbed dose unit is the milligray (mGy). 1 mrd = 0.01 mGy, and 1 mGy = 100 mrd.
Frequently asked questions
- How many grays are in one millirad?
- One millirad = 0.00001 Gy (grays).
- How many rads are in one millirad?
- One millirad = 0.001 rd (rads).
- How many centigrays are in one millirad?
- One millirad = 0.001 cGy (centigrays).