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TeachMeFinance.com - explain Roentgen (R) Roentgen (R) The term 'Roentgen (R)' as it applies to the area of nuclear science can be defined as ' A unit of exposure to ionizing radiation. It is the amount of gamma or x-rays required to produce ions resulting in a charge of 0.000258 coulombs/kilogram of air under standard conditions. Named after Wilhelm Roentgen, the German scientist who discovered x-rays in 1895. '. Previous 5 Terms: rocks rod Rodenticide Rodlet or GAD basket roentgen Next 5 Terms: Rogue Wave Roll Cloud Roll front Rolled fill dam Rolled Filled Dam 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.