Re: EPDs in Medical Environments

[Paul Demopoulos <paul.demopoulos@yale.edu>]

Joe,

We are currently monitoring areas around a magnicon with a combination of
detectors including TLD, film, electrets, and a Victoreen 450 Pressurized Ion
Chamber in integrate mode. This Magnicon has about a 2.5 msec pulse width,
about 1 pulse per second prf and about an average energy of about 100 kv.

Comparing the EPD, a Siemens isotrak Doseguard, we have seen a relative
response of about 50 % compared to the integrating electrets and about 75 %
comparative response to the integrating Victoreen 450 P. We have not received
enough data to date from the TLDs and film. From our information thus far the
EPDs under respond by 25 -50 % but do seem to work for sub second pulsed x-ray
or photon fields.

Paul Demopoulos
Paul.demopoulos@yale.edu

 joseph.greco@kodak.com wrote:

> Is anyone currently using electronic personal dosimeters for radiation
> monitoring of X-ray workers (in addition to film or TLD)?  I'm thinking of
> personnel who may install/perform maintenance on X-ray systems who may have
> potential for inadvertant/unexpected exposures during installation
> procedures.  If so, would the EPDs have sufficient response time for
> sub-one second type of exposures, as are typical of radiographic units?
> Besides also requiring an integrating dosimeter such as film, what other
> limitations would be involved if using this technology?
>
> Thanks in advance for information provided.
>
> J. M. Greco
> joseph.greco@kodak.com
>
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