Convert Grays to Megagrays
Convert Grays (Gy) to Megagrays (MGy) instantly and accurately.
Conversion Formula
MGy = Gy × 1.000000000e-6
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 Megagrays
The megagray (MGy) equals 10⁶ Gy. Doses in the MGy range destroy virtually all molecular structures. Radiation chemistry of water reaches radical recombination equilibrium above 1 MGy; neutron-irradiated reactor pressure vessel steels accumulate fast-neutron damage equivalent to 0.01-1 MGy over a 40-year lifetime. 1 MGy = 10⁶ Gy = 10⁸ rad.
Quick Reference Table
| Grays (Gy) | Megagrays (MGy) |
|---|---|
| 1 Gy | 1 × 10-6 MGy |
| 2 Gy | 2 × 10-6 MGy |
| 5 Gy | 5 × 10-6 MGy |
| 10 Gy | 1 × 10-5 MGy |
| 25 Gy | 2.5 × 10-5 MGy |
| 50 Gy | 5 × 10-5 MGy |
| 100 Gy | 1 × 10-4 MGy |