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TeachMeFinance.com - explain Lethal dose (LD) Lethal dose (LD) The term 'Lethal dose (LD)' as it applies to the area of nuclear science can be defined as ' The dose of radiation expected to cause death to 50 percent of an exposed population within 30 days (LD 50/30). Typically, the LD 50/30 is in the range from 400 to 450 rem (4 to 5 sieverts) received over a very short period. '. Previous 5 Terms: leporine leprology leptometer LESA Lessee Next 5 Terms: lethiferous Letter Of Request Letter Of Support Letterbox leucochroic 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.