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Derived air concentration-hour (DAC-hour)
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).
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- Part of Speech: noun
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- Industry/Domain: Energy
- Category: Nuclear energy
- Company: U.S. NRC
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