Fermi 2 also uses a "similated filter" alpha calibration source so that no further correction factor need be applied. It has a 0.5 mg/cm2 mylar covering which supposedly simulates 20% self-absorption. Of course it's going to matter which type of air sample filter is used: PTFE filters are much less "fuzzy" and thus would be expected to have lower self-absorption.
Tom VanderMey, CHP Principal Radiological Engineer DTE Energy, Fermi 2 734-586-1539 [email protected] wrote: ----- To: "[email protected]" <[email protected]> From: BJ Thompson <[email protected]> Sent by: [email protected] Date: 04/06/2012 05:17PM Subject: Powernet: RE: Air sample alpha analysis North Anna does not use a correction factor for attenuation/transmission/self absorption factor for alpha analysis for particulate air samples. Our calibration sources are made utilizing the same air sampling media patches. This eliminates the use of a separate correction factor since this is built into our instrument’s efficiency (G-5020 and iSolo) during calibration. We do have correction factors for liquid samples counted for alpha. Barbara J. Thompson Supervisor of Exposure Control Dominion - North Anna Power Station Email: [email protected] Phone: 540-894-2605 Beeper: #3469 FAX: 540-894-2408 From: [email protected] [mailto:[email protected]] On Behalf Of Barnby, Monica Sent: Wednesday, April 04, 2012 12:04 PM To: '[email protected]' Subject: Powernet: Air sample alpha analysis Diablo Canyon wants to know .. What (if any) attenuation / transmission / self absorption factor is used for alpha analysis of particulate air samples? Any input will be appreciated! Monica Barnby PG&E Diablo Canyon Health Physicist 805 545 3566 CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and/or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
