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TeachMeFinance.com - explain Derived air concentration (DAC) Derived air concentration (DAC) The term 'Derived air concentration (DAC)' as it applies to the area of nuclear science can be defined as ' The concentration of a given radionuclide in air which, if breathed by the reference man for a working year of 2,000 hours under conditions of light work (with an inhalation rate of 1.2 cubic meters of air per hour), results in an intake of one annual limit on intake (ALI). Established DAC values are given in Table 1, Column 3, of Appendix B to Title 10, Part 20, of the Code of Federal Regulations (10 CFR Part 20), 'Standards for Protection Against Radiation.' '. Previous 5 Terms: Depth of Runoff Derecho Deregulation deric Derivative File Next 5 Terms: Derived Air Concentration-Hour (DAC-hour) Derived Products Dermal Dermal contact Dermal toxicity 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.