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TeachMeFinance.com - explain Derived Air Concentration-Hour (DAC-hour) Derived Air Concentration-Hour (DAC-hour) The term 'Derived Air Concentration-Hour (DAC-hour)' as it applies to the area of nuclear science can be defined as ' The product of the concentration of radioactive material in air (expressed as a fraction or multiple of the derived air concentration for each radionuclide) and the time of exposure to that radionuclide, in hours. A licensee may take 2,000 DAC-hours to represent one annual limit on intake (ALI), equivalent to a committed effective dose equivalent of 5 rems (0.05 Sv). '. Previous 5 Terms: Derecho Deregulation deric Derivative File Derived air concentration (DAC) Next 5 Terms: Derived Products Dermal Dermal contact Dermal toxicity dermatoglyphics 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.