Gray 3 : The SI (International System of Units) unit of absorbed dose. One gray (Gy) is equal to an absorbed dose of 1 joule / kg (1 Gy: 100 rads. (The joule is the SI unit of energy, abbreviated as J. See: absorbed dose
National Environmental Policy Act (NEPA), Glossary of Terms Used in DOE NEPA Documents, US Department of Energy, Office of NEPA Policy and Compliance, USA 1998. http://energy.gov/sites/prod/files/NEPA_Glossary%2 008_2011.pdf, (EHS - Amer) {515}