Re: Investigation Levels for Extremities

[sandy_perle@email.fpl.com]

     The Regulatory Limit for Extremity dose is 50 rem/year (to each 
     individual extremity). Our site admin limit is 25 rem/yr. We 
     investigate any exposure if the difference between a TLD and 
     estimating device, be it a PIC or an EPD is greater than 25% between 
     the two devices. If the exposure for the extremity approaches or 
     exceeds the administrative limit that is expected for the specific job 
     the individual has worked (we track dose real-time for every job and 
     entry) an investigation is also conducted.
     
     In the power plant environment anyway, the real world is ... extremity 
     dose (SDE-ME) hardly ever exceeds the deep dose equivalent (DDE). 
     Where one would expect a dose greater than DDE is in the chemistry lab 
     or when the individual is working on a specific component in the 
     field, but this is not a high percentage of work. My own opinion is 
     that we do NOT need to do as much finger ring or wrist badge 
     monitoring at all .. based on the high regulatory limits and the low 
     extremity dose reported each year. We have enough survey data to go 
     along with the DDE TLD worn.
     
     
     
     Sandy Perle        
     Supervisor Health Physics
     Florida Power and Light Company
     Nuclear Division
     Juno Beach, FL
     
     (407) 694-4219 Office
     (407) 694-3706 Fax
     
     sandy_perle@email.fpl.com
     
     homepage: http://www.wp.com/54398/home.html
     
     DISCLAIMER: The comments and opinions are mine alone and do not        
                 necessarily reflect those of my employer
  
______________________________ Reply Separator _________________________________
Subject: Investigation Levels for Extremities
Author:  radsafe@romulus.ehs.uiuc.edu at Internet-Mail
Date:    4/30/96 9:36 AM


From: shand


         In keeping with our ALARA program we are assigning
         investigation levels to extremity monitoring results.
         Typical TLD exposures that would warrant this at our
         license have come back as 250 - 500 mrem for a 30 day
         period of wear.  Please comment on how you assign
         investigation levels for extremity monitoring results.
         Could one use ICRP-54 as a guide for this ?

            thank you for your response(s).


                        steve
                        UMCP