[ RadSafe ] Panasonic UD-814 Technical Specification Sheet

Sander Perle sandyfl at cox.net
Thu Apr 7 12:34:38 CDT 2016

Here are the various Panasonic dosimeter specs:


The three CaSO4 elements are all behind the same filtration, and are
averaged not because of the manufacturing inconsistency, but for better
statistics. The process for any TLD is to normalize each element on a TLD to
a known value, and this is the Element Correction Factor (ECF) Panasonic, or
typically the Element Correction Coefficient (ECC) for Harshaw type TLDs.

Your comment "The variability amongst the three calcium sulfate elements is
assessed and if not acceptable additional TLD measurements will be made² is
not technically a logical statement. Consider that the elements are very
close to each other on the TLD card, and, these environmental dosimeters are
used for that specific purpose, typically gamma and x-ray, where there is
not going to be much variability. If there is a variability that causes one
to take additional TLD readings, then there is an issue with the process
that the facility if following in establishing ECFs. Of course one can
assess angularity, but that is not typically an issue in these field


Retired, Consultant

From:  <radsafe-bounces at health.phys.iit.edu> on behalf of Stacey Alderson
<salderson at stoller.com>
Reply-To:  "The International Radiation Protection (Health Physics) Mailing
List" <radsafe at health.phys.iit.edu>
Date:  Thursday, April 7, 2016 at 10:22 AM
To:  "radsafe at health.phys.iit.edu" <radsafe at health.phys.iit.edu>
Subject:  [ RadSafe ] Panasonic UD-814 Technical Specification Sheet

> Can anyone help with providing a technical specification sheet for the
> Panasonic UD-814AS TLD?  Also, I am reviewing a document in which a single
> UD-814AS is placed at a height of 1 meter for 90 days.  After the exposure
> period the single TLD is recovered and processed.  The variability amongst the
> three calcium sulfate elements is assessed and if not acceptable additional
> TLD measurements will be made?  The document infers that the three calcium
> sulfate elements are independent measurements.  Is this an acceptable method?
> I was under the assumption that the average of the three elements was used to
> account for element manufacturing inconsistency and annealing.
> Thanks,
> Stacey Alderson
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