Question: what is mgy stand for?
Answer: From Wikipedia, the free encyclopedia. MGY or a variant thereof is used as an acronym or abbreviation for: MGy, megagray: 106 gray, an SI unit of absorbed dose. mGy, milligray: 10−3 gray, an SI unit of absorbed dose. mgy, MGY, mmgy, MMgy, or MMGY: Million gallons per year.