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Question 47: Will the NRC provide guidance on preparation
of applications pursuant to 10 CFR 20.1204 (c) (2) for
approval to adjust DAC or ALI values to reflect the actual
physical and chemical characteristics of airborne
radioactive materials (e.g., aerosol size distribution or
density)?
Answer: The NRC staff is considering developing such
guidance. Some limited guidance on "adjusting DAC's for
particle size" is included in draft Regulatory Guide 8.25,
Rev. 1, Section 3.7; however, the staff recognizes that
more extensive guidance, including considerations of other
physical and chemical characteristics of particles, may be
needed. (Reference: 10 CFR 20.1204 (c) (2))