[ RadSafe ] TLD and EPD dose comparisons (correction)

[Perle, Sandy]

Correction below. The EPD can UNDER-RESPOND ii higher photon and lower
photon energies when calibrated to Cs-137 (looks like a bell-shaped curve).


Regards,

Sandy

-----------------------------------
Sander C. Perle
President
Mirion Technologies
Dosimetry Services Division
2652 McGaw Avenue
Irvine, CA 92614

+1 (949) 296-2306 (Office)
+1 (949) 296-1130 (Fax)

Mirion Technologies: http://www.mirion.com/



On 2/21/11 7:03 AM, "Perle, Sandy" <SPerle at mirion.com> wrote:

>You don't state what the issue is and the magnitude of difference between
>the TLD and EPD dose comparisons. Considerations:
>
> 1.  What work environment are the individuals working in?
> 2.  Are the difference that you are referring to collective dose or
>differences amongst individuals?
> 3.  What type of TLD and EPD are you using?
> 4.  What are the typical doses being observed that you're trying to
>compare?
> 5.  To what and how do you calibrate the TLD and the EPD?
> 6.  Are the calibration energies typical for the work area energies,
>both type of radiation and magnitude?
> 7.  Do you apply a correction factor to the EPD?
> 8.  What type of dose algorithm do you use for your TLD?
> 9.  Does the dose difference change during different types of work
>actives?
> 10. If you have an appropriate TLD dose algorithm, be cognizant that an
>EPD typically over-responds in giggler and lower photon energies, and if
>you're calibrating to a mid-range energy, such as Cs-137 and you're
>working in a much higher energy area, the EPD can over-respond.
> 11. Do you have much scatter? This could again be an algorithm and
>energy issue?
>
>Please provide additional information and support could be provided to
>you.
>
>Regards,
>
>Sandy
>
>-----------------------------------
>Sander C. Perle
>President
>Mirion Technologies
>Dosimetry Services Division
>2652 McGaw Avenue
>Irvine, CA 92614
>
>+1 (949) 296-2306 (Office)
>+1 (949) 296-1130 (Fax)
>
>Mirion Technologies: http://www.mirion.com/
>
>
>
>
>
>
>On 2/21/11 12:38 AM, "Ndanduleni Nephale"
><ndanduleni.nephale at necsa.co.za<mailto:ndanduleni.nephale at necsa.co.za>>
>wrote:
>
>We are using TLD as a primary dosimeter and EPD for dose management. We
>are always having a problem since the monthly results show a big
>different between TLD and EPD results. Is the anyway which your could
>compare the results of TLD and EPD?
>
>Ndanduleni Nephale
>Scientist
>Tel: +27 12 305 3396
>Fax: +27 12 305 3484
>Cell: +27 73 456 9404
>Email: mailto:ndanduleni.nephale at necsa.co.za
>Website: http://www.necsa.co.za/
>
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