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TeachMeFinance.com - explain Nuclear poison (or neutron poison) Nuclear poison (or neutron poison) The term 'Nuclear poison (or neutron poison)' as it applies to the area of nuclear science can be defined as ' In reactor physics, a substance (other than fissionable material) that has a large capacity for absorbing neutrons in the vicinity of the reactor core. This effect may be undesirable in some reactor applications because it may prevent or disrupt the fission chain reaction, thereby affecting normal operation. However, neutron-absorbing materials (commonly known as 'poisons') are intentionally inserted into some types of reactors to decrease the reactivity of their initial fresh fuel load. (Adding poisons, such as control rods or boron, is described as adding 'negative reactivity' to the reactor.) '. Previous 5 Terms: Nuclear electric power (nuclear power) Nuclear Energy Agency (NEA) Nuclear force Nuclear fuel Nuclear Material Management and Safeguards System (NMMSS) Next 5 Terms: Nuclear power plant Nuclear Radiological Incident Annex Nuclear reactor Nuclear steam supply system Nuclear transfer 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.