No. Alpha CAM's are used to evaluate the engineering controls and to provide an indication should they begin to fail. Lapels air samplers are used to assign DAC-hours. Low volume air samplers are used to allow entry into non-contaminated areas without using lapels. The results of the low vol air samplers are basically used to perform the prospective analysis to determine why someone doesn't have to have internal dosimetry. Our mixture of isotopes, and our ratios of gamma to alpha isotopes, vary enough that we can't use a WBC to assess dose. The exit portals can't see 10% of an ALI based on our mixtures. As such, lapel air samplers are the only accurate method we have to assess DAC-hour intake
John Albers Radiation Protection Manager Humboldt Bay Power Plant Pacific Gas and Electric Company 1000 King Salmon Road Eureka CA 707-499-7613 (cell) From: [email protected] [mailto:[email protected]] On Behalf Of Creamer, Charles E Sent: Monday, January 23, 2012 7:32 AM To: [email protected] Subject: Powernet: DAC Hour Assignment from CAMS One of our managers completed a self assessment on our air sampling practices. One of the actions resulting from this assessment was to benchmark utilities on use of AMS-4 for general area air sampling and analysis of potential inhalation intakes and DAC-HR assignment to workers. Browns Ferry does not currently do this as our AMS-4s are used as an indicator and we would pull an air sample if necessary. Does anyone in the industry assign DAC-Hrs from a CAM reading? ___________________________ Chuck Creamer Charles E. Creamer Health Physicist Tennessee Valley Authority Browns Ferry Nuclear Plant P.O. Box 2000 (Mail Stop NAB-1G-BFN) Decatur, Al. 35609-2000 Phone: 256-729-2983 Fax: 256-729-3101 Pager: 1-800-323-4853, pin 30-053 mailto:[email protected]
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