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
The Quest: Energy, Security, and the Remaking of the Modern World and not taking a strong position on subjects such as climate change, although "The Wall Street Journal" said that the book succumbed to "the conventional alarmist storyline” on climate. Finally, peak oil advocates take strong issue with Yergin’s handling of the subject in the book, particularly the discussion of the founding of the peak theory and the potential for future oil discoveries. The Quest: Energy, Security, and the Remaking of the Modern World The Quest: Energy, Security, and the Remaking of the Modern World is an international bestselling book by energy expert Daniel Yergin. The book was initially published on