Convert Grays to Millirads
Convert Grays (Gy) to Millirads (mrad) instantly and accurately.
Conversion Formula
mrad = Gy × 100000
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.
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.
Quick Reference Table
| Grays (Gy) | Millirads (mrad) |
|---|---|
| 1 Gy | 100000 mrad |
| 2 Gy | 200000 mrad |
| 5 Gy | 500000 mrad |
| 10 Gy | 1000000 mrad |
| 25 Gy | 2500000 mrad |
| 50 Gy | 5000000 mrad |
| 100 Gy | 10000000 mrad |