Electronic Dosimetry

[WERNER.K.PAULHARDT@bge.com]

     Fellow RadSafers:
     
     In response to the request for dose of record info, I offer the 
     following response:
     
     We use the Siemens EPD for controlling our site dose.  We process TLDs 
     quarterly for record dose. We have approximately 2 years worth of 
     operating experience with the Siemens EPD and are moving in the 
     direction of using the EPD as a record dosimeter.  The EPD has passed 
     "mock" NVLAP Proficiency testing in all categories with the exception 
     of 3A shallow and Neutrons.  Overall, the EPD performed as well as the 
     TLD (Panasonic UD-802) in some cases, better than the TLD.  Our 
     TLD/EPD ratio has been trended since the 3rd quarter of 1995 and has 
     run between 0.90 and 0.9997 (one being absolute perfect).  I will also 
     add that the above ratio is obtained from the EPD when it comes from 
     the factory.  We do not compensate, in any way, the EPD to read like 
     the TLD.  If anyone would like further information, please contact me 
     at (410) 495-4773 or werner.k.paulhardt@bge.com.
     
     Sincerely,
     
     Werner K. Paulhardt
     Supervisor-Dosimetry
     Calvert Cliffs Nuclear Power Plant