Columbia Generating Stations response. 1. Do you base in-plant contamination survey data (dpm/100cm2) on frisker cpm readings of survey smears times 10 (assuming 10% efficiency), or on beta proportional counter (e.g. Tennelec or Protean) beta dpm smear readings, or both? Frisker cpm readings of survey smears times 10 (assuming 10% efficiency) only.
2. Do you prefer one of these results--frisker or beta proportional counter? N/A 3. Have you seen differences in these results? N/A 4. Do you make any effort to adjust these results for your gamma component, e.g. electron capture nuclides not detected by beta counters? N/A From: [email protected] [mailto:[email protected]] On Behalf Of Thomas J Vandermey Sent: Saturday, November 13, 2010 7:31 AM To: [email protected] Subject: Powernet: Questions on contamination survey data Fermi is evaluating contamination survey smear counting methods and requests answers to the following: 1. Do you base in-plant contamination survey data (dpm/100cm2) on frisker cpm readings of survey smears times 10 (assuming 10% efficiency), or on beta proportional counter (e.g. Tennelec or Protean) beta dpm smear readings, or both? 2. Do you prefer one of these results--frisker or beta proportional counter? 3. Have you seen differences in these results? 4. Do you make any effort to adjust these results for your gamma component, e.g. electron capture nuclides not detected by beta counters? Thanks in advance, Tom VanderMey, CHP Principal Radiological Engineer DTE Energy, Fermi 2 734-586-1539
