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Estimate DAC



I am reasearching different methods that people are using to estimate
DAC based on loose surface contamination levels for input into ALARA
evaluations for respiratory protection, engineering controls, etc. The
method should be more of a "thumb rule" that can be used as a field
evaluation rather than a detailed calculation using particle size and
the like. It is for a nuclear power plant application using Co-60 as the
predominant nuclide. Any ideas would be greatly appreciated.