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
Work unit Work unit A unit or danwei () is the name given to a place of employment in the People's Republic of China. While the term "danwei" remains in use today it is more properly used to refer to a place of employment during the period when the Chinese economy was not as developed and more heavily reliant on welfare for access to long-term urban workers or when used in the context of one of state-owned enterprises. Prior to Deng Xiaoping's economic reforms, a work unit acted as the first step of a multi-tiered hierarchy linking each individual with the central