DAC
The concentration of radioactive material in air and the time of exposure to that radionuclide in hours. An NRC licensee may take 2000 hours to represent one ALI, equivalent to a committed effective dose equivalent of 5 rems (0.05 sievert).
Digital Array Acoustilog
Dual Attachment Concentrator (FDDI)
Datafield Access Conditions
Data Access Component;Discretionary Access Control;Dual Attachment Concentrator (FDDI);Digital Analog Converter