Gray (unit) Gray (unit) The gray (symbol: Gy) is a derived unit of ionizing radiation dose in the International System of Units (SI). It is defined as the absorption of one joule of radiation energy per kilogram of matter. It is used as a unit of the radiation quantity absorbed dose which measures the energy deposited in a unit mass at a certain position, and of the radiation quantity kerma, which is the amount of energy that is transferred from photons to electrons per unit mass at a certain position. The corresponding cgs unit to the gray is the rad (equivalent to
Energy-Safety and Energy-Economy "Energy Safety and Energy Economy" publishes a quarterly appendix. "Energy Safety and Energy Economy" is a winner of the National Ecological Prize, Russian Energy Olympus contest, Social and Economic Significant Projects in Education, Culture and Ecology contest, Save Energy contest, and others. Energy-Safety and Energy-Economy Energy Safety and Energy Economy () is a peer-reviewed scientific and technical journal covering energy safety and economy, safety regulations, personnel training, innovation, and recent trends in alternative power sources research. The editor-in-chief is Svetlana Zernes (). It was established in 2005 as "Energy Safety in Documents and Facts Journal", obtaining its current title in