Convert Millirads to Grays
Convert Millirads (mrad) to Grays (Gy) instantly and accurately.
Conversion Formula
Gy = mrad × 1.000000000e-5
About Millirads
The millirad (mrad) equals 10⁻³ rad = 10⁻⁵ Gy = 10 µGy. Older US health physics reports and NRC licence conditions quote occupational extremity doses in mrad; some film badge dosimetry reports still use mrad for historical continuity. 1 mrad = 10⁻³ rad = 10⁻⁵ Gy = 10 µGy.
About Grays
The gray (Gy) is the SI coherent unit of absorbed radiation dose, defined as 1 joule of energy deposited per kilogram of matter. Named after Harold Gray (British radiobiologist, 1905-1965). Used globally in radiotherapy: curative tumour doses 40-80 Gy fractionated; total body irradiation before bone marrow transplant 12-14 Gy. 1 Gy = 1 J/kg = 100 rad.
Quick Reference Table
| Millirads (mrad) | Grays (Gy) |
|---|---|
| 1 mrad | 1 × 10-5 Gy |
| 2 mrad | 2 × 10-5 Gy |
| 5 mrad | 5 × 10-5 Gy |
| 10 mrad | 0.0001 Gy |
| 25 mrad | 0.00025 Gy |
| 50 mrad | 0.0005 Gy |
| 100 mrad | 0.001 Gy |