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TeachMeFinance.com - explain Unwanted Radioactive Material (Orphan Sources) Unwanted Radioactive Material (Orphan Sources) The term 'Unwanted Radioactive Material (Orphan Sources)' as it applies to the area of nuclear science can be defined as ' refers to sealed sources of radioactive material contained in a small volume (but not radioactively contaminated soils and bulk metals) in any one or more of the following conditions (taken from the NRC Orphan Source Initiative): In an uncontrolled condition that requires removal to protect public health and safety from a radiological threat; Controlled or uncontrolled, but for which a responsible party cannot be readily identified; Controlled, but the material's continued security cannot be assured. If held by a licensee, the licensee has few or no options for, or is incapable of providing for, the safe disposition of the material; In the possession of a person, not licensed to possess the material, who did not seek to possess the material; or In the possession of a state radiological protection program for the sole purpose of mitigating a '. Previous 5 Terms: Unstable Air Unstable isotope UNSTBL Unsteady flow Unsuitable material Next 5 Terms: Unwatering Upconvert updraft updrift upland 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.