I'd like to suggest caution on publishing a ion chamber beta activity correction factor. It is very energy dependent as well as geometry dependent.
In my opinion, if you need a factor, It is better to determine it for the particular occasion. A correlation can be determined by measuring some activity near the upper end of a frisker then counting it on an ion-chamber. This should get you a reasonably close conversion factor that is appropriate for the beta energies being measured. David Brehm Fort Calhoun Nuclear Station Supervisor - Radiological Equipment & Dosimetry Office: 402.533.7582 Cellular: 402.214.0107 Pager: 402.561.3310 From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Saturday, November 06, 2010 6:33 AM To: [email protected] Subject: Powernet: Ion chamber reading to dpm conversion With respect to determining contamination levels using an ion chamber instrument, there appears to be two schools of thought: 1. The ion chamber open window reading in mR/h is converted to dpm according to the following relation ship: 1 mR/h = 50 kdpm 2. The difference of open window minus closed window is multiplied by the BCF and the result is converted to dpm according to the relationship: 1 mR/h = 50 kdpm What method do you use and do you have (or know of) a reference for your method? Thanks in advance, Jeffrey J. Cady, CHP, RPT Mgr RP Technical Support Exelon Nuclear Dresden Station Phone: (815) 416-2719 [email protected] ************************************************** This e-mail and any of its attachments may contain Exelon Corporation proprietary information, which is privileged, confidential, or subject to copyright belonging to the Exelon Corporation family of Companies. This e-mail is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this e-mail is strictly prohibited and may be unlawful. If you have received this e-mail in error, please notify the sender immediately and permanently delete the original and any copy of this e-mail and any printout. Thank You. ************************************************** This e-mail contains Omaha Public Power District's confidential and proprietary information and is for use only by the intended recipient. Unless explicitly stated otherwise, this e-mail is not a contract offer, amendment, nor acceptance. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.
