Convert Milligrays to Grays
Convert Milligrays (mGy) to Grays (Gy) instantly and accurately.
Conversion Formula
Gy = mGy × 0.001
About Milligrays
The milligray (mGy) equals 10⁻³ Gy and is the standard unit for diagnostic radiology patient doses. CT head scan ~20-60 mGy; abdominal CT ~10-30 mGy; mammography mean glandular dose ~1-3 mGy. IAEA and EU medical exposure directives set diagnostic reference levels in mGy. 1 mGy = 10⁻³ Gy = 0.1 rad.
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
| Milligrays (mGy) | Grays (Gy) |
|---|---|
| 1 mGy | 0.001 Gy |
| 2 mGy | 0.002 Gy |
| 5 mGy | 0.005 Gy |
| 10 mGy | 0.01 Gy |
| 25 mGy | 0.025 Gy |
| 50 mGy | 0.05 Gy |
| 100 mGy | 0.1 Gy |