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 Research Institute of Russian Academy of Sciences divided into the following research areas: The Institute’s work is based on complex mathematical modeling, a unique database, and advanced computer technologies. Today, ERIRAS is a major scientific center that is at the forefront of fundamental and applied research. The knowledge produced by ERIRAS provides the basis for energy development forecasting and policy in Russia, the CIS, and for international energy markets. Energy Research Institute of Russian Academy of Sciences Founded in July 1985, the Energy Research Institute of the Russian Academy of Sciences (ERIRAS) was originally an outgrowth of the general energy department at Institute for High Temperatures RAS