You quoted Section C.1.7 of Reg. Guide 8.25. This is somewhat misleading, since this section is for "Establishing Airborne Radioactivity Areas," NOT for evaluating respiratory protection. It is more appropriate to use Table 1 of this Regulatory Guide. This states that: "Continuous air monitoring should be provided if there is a potential for intakes to exceed 40 DAC-hours in 1 day. (Credit may be taken for protection factors if a respiratory protection program is in place.)" Bill Lipton The opinions expressed are strictly mine.
- To: Multiple,recipients,of,list,radsafe@romulus.ehs.uiuc.edu
- Subject: respiratory protection -Reply
- From: "radsafe@romulus.ehs.uiuc.edu" <radsafe@romulus.ehs.uiuc.edu>
- Date: 21 Aug 96 12:20:15
- Reply-to: radsafe@romulus.ehs.uiuc.edu
With regard to a time for averaging airborne concentrations, the NRC's Regulatory Guide 8.25, "Air Sampling in the Workplace," states (in paragraph C.1.7), "To determine whether the concentration exceeds the DAC over the short term, the sample collection time should not exceed 1 hour. Shorter collection times may be used if required, but they are not required." Thus, a 1-hour sampling time is acceptable for measuring peak concentrations.