STP responds as follows: We use the Siemens/Thermo Mk2 dosimeter which displays to the tenth of a mrem. We changed our software about three years ago to display and record dose to the tenth mrem for each entry. When reports are generated from the data, the dose is summed then rounded to the nearest mrem. The motivation was not based on ALARA performance but rather agreement between ED dose and TLD dose, mainly for workers who do not accrue more than 100 mrem during a TLD issue period, six months. This change has improved the agreement.
Regards, Leonard Earls, Ph.D., CHP Consulting Engineer 361-972-7759 ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, December 20, 2011 12:55 To: [email protected] Subject: Powernet: Tracking electronic dosimeter dose to tenths? San Onofre currently tracks electronic dosimeter dose to integer mrem (a deliberate decision when we implemented the MGPI DMC-2000S dosimeters). We understand that some plants track dose to tenths of an mrem. Reportedly, there is an ALARA benefit for this additional precision. I have two questions: How many plants/fleets are tracking ED dose to tenths of a mrem? How does such precision impact ALARA performance? In other words, what worker behaviors change when a worker sees 4.4 mrem instead of 4, or 4.7 mrem instead of 5? Thanks and Happy Holidays from sunny (today) California, Eric Eric M. Goldin, CHP Southern California Edison <[email protected]> ----------------------------------- Powernet - a service of the Health Physics Society Power Reactor Section Powernet archives at http://www.mail-archive.com/[email protected]/ Reply to: [email protected] If Questions, contact Mike Russell, CHP at [email protected]
