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
Jeffrey Energy Center Jeffrey Energy Center Jeffrey Energy Center (Jeffrey EC) is a sub-bituminous coal-fired power plant located in Emmett Township, Pottawatomie County, seven miles (11 km) northwest of St. Marys, Kansas. Jeffrey EC is jointly owned by Westar Energy, Topeka, Kansas and Aquila Corp., Kansas City, Missouri. Jeffrey EC is composed of three separate 800-MW units providing a name-plate energy center capacity of 2.16 gigawatts. Unit 1 began operation in 1978, unit 2 in 1980 and unit 3 in 1983. Jeffrey EC is a typical modern coal-fired energy center. Its primary mission is to convert the chemical energy available from its Wyoming