Greetings All, I cannot speak to the requirements put on the irradiation facility providing a blind spike, but what I can say is that there can be some variation between facilities as to what doses they might be delivering. It is not a lot, but it would not be unusual to see variations of 5% between what one facility or another might be delivering for something as simple as Cs-137. More for sources that have some variation, such as Depleted Uranium slabs. This variability is not a big deal per se, but if you are using them to calibrate or "grade" your dose algorithm for example, then it could become significant. If you are using outside vendors to "grade" your system rather than just acknowledge the presence of an irradiated TLD, then you might consider an intercomparison between your spike vendor and the NVLAP irradiation lab.
TLD Vendors do this all the time as they run QC dosimeters that they irradiate themselves. They keep very close track of variations such as this. There are plenty of mitigating factors such as the actual time of irradiation vs the time of reading. Vendors typically assume uniform irradiation (or all the dose happened in the middle of the issue period), so if you were to run a spike on one day, and read it the next on a dosimeter you got from the vendor 90 days before, you would get a different number than if you ran a spike and read it a month later. To me, blind spikes are a good test of the system to determine if an irradiated badges would be recognized, and if there were notifications required of high dose for example, do you get them, and how long does it take to get them? Otherwise the vendor does this all the time as part of their NVLAP Accreditation. Yours, Rob Robert J. Gunter, MSc, CHP CHP Consultants/CHP Dosimetry P.O. Box 4126 Oak Ridge, TN 37831 www.chpconsultants.com<http://www.chpconsultants.com/> - Consulting and Nuclear Instrumentation www.chpdosimetry.com<http://www.chpdosimetry.com/> - Radiation Dosimetry Services https://counts.pro/ - Transform you radiation meter to a mobile laboratory Toll Free: (888) 766-4833 Fax: (866) 491-9913 Cel: (865) 387-0028 [email protected]<mailto:[email protected]> [facebook]<https://www.facebook.com/search/str/CHP+Dosimetry/keywords_top> [Linkedin] <https://www.linkedin.com/in/robert-gunter-60466122?trk=hp-identity-name> From: Powernet [mailto:[email protected]] On Behalf Of Harris, Willie O:(GenCo-Nuc) via Powernet Sent: Thursday, May 31, 2018 8:32 AM To: [email protected] Cc: Harris, Willie O:(GenCo-Nuc) <[email protected]> Subject: Re: [Powernet] [EXTERNAL] I have a related question to Douglas L Noble's question on " TLD Spike Sample Vendor" Mike I can forward the Exelon procedure as needed. One thing that is being discussed at the RP Delivering the Nuclear Promise team is either deleting these blind spikes and just use the vendor NVLAP and testing results or as a minimum come up with a standard industry method that is efficient to administer. The meeting is scheduled for next week June 5th to discuss the topic Willie Harris, CHP RRPT Director, Radiation Protection 200 Exelon Way Kennett Square, PA 19348 Office Phone: 610.765.5350 Cell: 484-885-0578 [email protected]<mailto:[email protected]> From: Powernet [mailto:[email protected]] On Behalf Of Macho, Michael via Powernet Sent: Wednesday, May 30, 2018 3:30 PM To: [email protected]<mailto:[email protected]> Cc: Macho, Michael <[email protected]<mailto:[email protected]>> Subject: [EXTERNAL] [Powernet] I have a related question to Douglas L Noble's question on " TLD Spike Sample Vendor" I have a related question to Douglas L Noble's question on " TLD Spike Sample Vendor" 1) I would like to know the users of a contractor dosimeter DLRs who perform blind spikes and if there is a particular frequency (e.g., on all personnel DLRs returned for processing)? 2) What radiation types/ANSI 13.11 categories are used for the spikes and is there a particular delivered dose range tested? 3) Is there a particular number of spikes per range and category? 4) INPO 05-008 Rev2 had indicated a processor's requirements, but Rev 3 doesn't indicate these requirement. What guidance or requirement drives the performance of blind spikes at your facility? Michael Macho Radiation Protection Staff [email protected]<mailto:[email protected]> [cid:[email protected]] SAFETY is first QUALITY SCHEDULE Luminant Power Comanche Peak Nuclear Power Plant 6322 North FM 56 or PO Box 1002 Mail Code 005A Glen Rose, TX 76043 (254)897-5698 /(254)897-8163 (817)559-1997 Cell From: Powernet [mailto:[email protected]] On Behalf Of Perle, Sandy via Powernet Sent: Thursday, May 17, 2018 1:35 PM To: [email protected]<mailto:[email protected]> Cc: Perle, Sandy <[email protected]<mailto:[email protected]>> Subject: Re: [Powernet] TLD Spike Sample Vendor EXTERNAL EMAIL There are other approved Calibration Labs by NVLAP, look under Calibration Facilities. You can also use A2LA spike, as well as other approved facilities. There is a NIST Bulletin that describes approved requirements (I am away and can provide later). Regards, Sandy Sent from my iPhone On May 17, 2018, at 11:25, Vickers, Glen:(GenCo-Nuc) via Powernet <[email protected]<mailto:[email protected]>> wrote: NIST NVLAP has approved performance testing labs (PTL) and I think they were the only one at the NIST site. Difficult dealing with them. Their DOE purchasing processes wants the money before the service for the length of the contract. We started going for an annual contract to minimize the amount of up-front money we give them. I'll buy you 2 Pepsi's if you can find someone else... Glen Vickers, CHP Exelon Corp RP Technical Lead 815-216-2723 (work/cell) From: Powernet [mailto:[email protected]] On Behalf Of Noble, Douglas L via Powernet Sent: Thursday, May 17, 2018 12:48 PM To: [email protected]<mailto:[email protected]> Cc: Noble, Douglas L Subject: [EXTERNAL] [Powernet] TLD Spike Sample Vendor Requesting if someone uses a company other than Battelle for tld spiked sample program? 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