Re: Extremity Dosimetry

[Tad Blanchard <Tad.M.Blanchard.1@gsfc.nasa.gov>]

I was always taught "never" to let anyone wear a "control badge".  The
control is placed in the area where only "background" or "transitory"
radiation would affect the entire batch of dosimeters.  Hence the name
"control".  



At 10:34 PM 7/19/96 -0500, you wrote:
>
>> Dear Radsafers:
>> 
>> Where should finger rings be kept when the individual is still in the 
>> restricted area, but not working with radioactive material?
>> 
>This is a problem of badge issue.  If one doesn't keep the finger rings with 
>the individual's regular whole body badge, it can become a bit difficult to 
>assign extremity dose for those periods where the person was working in "whole 
>body" dose fields (and exposing the extremities at the same time) but not 
>wearing specific finger dosimetry.
>
>For the most accuracy, I have always directed that finger rings be issued with 
>their own whole body badge ("set control").  When the individual wears the 
>rings, he removes his regular badge and wears the control badge at the body 
>location where he would normally wear his whole body badge.  When he is done 
>with the rings, he should put the rings and control badge in a low dose area 
>and resume wearing his "normal" badge.  When all the dosimetry is eventually 
>developed, then his whole body dose is equal to his regular badge + his
control 
>badge, and his extremity dose is equal to his "regular" badge + each finger's 
>ring dose.  This is not a profound concept, but it really saves some headaches 
>when one is trying to figure out doses at the end of a quarter.
>
>> 
>Jim Barnes, CHP
>RSO
>Rocketdyne Division; Rockwell International
>
>
>
**************************** /^\   /^\ *********************************
Tad  Blanchard              /__ \ /___\    NASA-Goddard Space Flt Ctr 
Nat'l Health Svc, Inc            O             Greenbelt, Maryland     
Sr Health Physics Tech          / \            Phone: 301-286-9157     
                               /___\                                   
                  Tad.M.Blanchard.1@GSFC.NASA.gov                   
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