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TeachMeFinance.com - explain Gray (Gy) Gray (Gy) The term 'Gray (Gy)' as it applies to the area of nuclear science can be defined as ' One of the two units used to measure the amount of radiation absorbed by an object or person, known as the 'absorbed dose,' which reflects the amount of energy that radioactive sources (with any type of ionizing radiation) deposit in materials (e.g., water, tissue, air) through which they pass. One gray (Gy) is the international system of units (SI) equivalent of 100 rads, which is equal to an absorbed dose of 1 Joule/kilogram. An absorbed dose of 0.01 Gy means that 1 gram of material absorbed 100 ergs of energy (a small but measurable amount) as a result of exposure to radiation. For additional information, see Doses in Our Daily Lives and Measuring Radiation. '. Previous 5 Terms: Gravity arch dam Gravity Dam Gravity irrigation Gravity Wave gray Next 5 Terms: Gray water Graybody grayling Grazing district Grazing fee About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.