[ RadSafe ] Question on Subtracting TLD Background

[CHASE John -NUCLEAR]

At OPG we have multiple badge storage locations, and we have control
badges for each of them. We subtract the background readings for the
individual badge elements. We have sometimes found significant
differences between badge racks, and in couple of cases, within the
badge racks. We also use historical data specific for individual badge
racks. The third method we use is to analyze a histogram of the low dose
results and use the peak value. This is a great way of seeing what is
going on at each of the badge racks, and sometimes with individual
workers.

John Chase
External Dosimetry Specialist
Ontario Power Generation

-----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 10:31 AM
To: radsafe at radlab.nl
Subject: [ RadSafe ] Question on Subtracting TLD Background


Hello,

 

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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