[ RadSafe ] Question on Subtracting TLD Background

Brennan, Mike (DOH) Mike.Brennan at DOH.WA.GOV
Thu May 28 12:08:25 CDT 2009

A very interesting question.  I'd say if you could show a number of
years where the dose at each storage board in question was constant (or
nearly so), and that the ratios between each of the boards and the
proposed centralized background location were constant, then you could
build an argument in favor of centralization.  If either is not true for
a particular storage board, then it clearly isn't going to fly.  

It might be useful to look at alternated technologies.  TLDs are old,
and far from perfect.  Depending on the situation, newer  digital
dosimeters might be better, and as they can be turned off when not being
worn, might eliminate the need for background measurements at the
storage board.   

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of Konzen, Kevin K
Sent: Thursday, May 28, 2009 7:31 AM
To: radsafe at radlab.nl
Subject: [ RadSafe ] Question on Subtracting TLD Background



I have a question regarding the practice of subtracting beta-gamma
background dose from TLDs in general.  Our facility has multiple storage
board locations where TLDs are kept when not being worn.  When the TLDs
are gathered at a prescribed interval (e.g., monthly or quarterly) for
processing, the background TLDs located on each storage board, are also
processed and used for the TLD background which is subtracted from the
individual TLDs.  We are investigating the feasibility of using a
centralized TLD background location in order to reduce the labor and
costs associated with using multiple background locations.  I haven't
been able to find any clear guidance prescribing the specifics of
measuring the background, other than to subtract it from the TLDs during
processing.  As part of this analysis, I would like to include other
facility practices.  If you have any information on current specific
guidance or practices, please respond to me directly at
Kevin.Konzen at icp.doe.gov. 


Thank You,

Kevin Konzen, CHP

ICP Technical Advisor 

Kevin.Konzen at icp.doe.gov

(208) 745-7108



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