Another consideration is to use modern plastic bodied PICs, versus the older aluminum bodies. Like the 451P, the modern PICs also have a lower threshold, which can be observed by shooting both PIC types inside a Model 89 or similar cave calibrator (test x-ray unit with minimum personnel risk).
Roger Schanzenbach, CHP San Clemente, CA (949) 677-5594 ----- Original Message ----- From: BREHM, DAVID M To: [email protected] Sent: Wednesday, July 17, 2013 6:55 AM Subject: Powernet: RE: X-Ray Radiography Experience? The only thing that comes to mind is that you may want to use a pressurized ion chamber dose rate instrument (e.g., Fluke 541P or Ludlum 9DP). They have a lower energy threshold than the standard ion chamber. We use the 451P for checking our x-ray machines to good effect. David Brehm Radiological Engineer Office: 402.533.7582 Radiation Protection - Nuclear Operations Cellular: 402.237-9840 Omaha Public Power District - Fort Calhoun Nuclear Station Pager: 402.561.3310 9610 Power Lane, Blair, NE 68008 [email protected] From: [email protected] [mailto:[email protected]] On Behalf Of Holmes, Stephen J Sent: Wednesday, July 17, 2013 8:03 AM To: '[email protected]' Cc: Eaton, Eric; Pell, Bryan; James, Scott; Garcia, Joseph D Subject: Powernet: X-Ray Radiography Experience? We have a proposal for a vendor to come on site and perform radiography using x-ray equipment. This equipment will emit x-rays of considerably lower energy (150 kVp max) than our typical gamma source term, and we are concerned about whether our instrumentation/dosimetry (calibrated to Cs-137) will adequately measure the dose from this device. We have previously performed pulsed x-ray radiography at Ginna, and had proven that our instrumentation performed satisfactorily, but this was at a significantly higher x-ray energy (300-400 kVp max). We plan on using the Fluke-Biomedical 451B ion chamber, Landauer BA series OSLs, and SRDs (pocket ion chambers) paired with the DMC2000s EDs to monitor the work. Do you have experience with x-ray radiography at your facility? If so, did you do any testing, or anything else (such as a white paper), to justify your ability to properly monitor the exposure from the x-ray source? If so, would you be willing to share the results or can you provide contact information? Thanks, -Steve Stephen J Holmes, CHP, PE Sr. Plant Health Physicist, CENG-RE Ginna NPP [email protected] 585-771-3577 This e-mail and any attachments are confidential, may contain legal, professional or other privileged information, and are intended solely for the addressee. If you are not the intended recipient, do not use the information in this e-mail in any way, delete this e-mail and notify the sender. -EXCIP ------------------------------------------------------------------------------ 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, or 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.
