[Intl_DxMedPhys] Reference for backscatter mitigation of shielded dose meters

[Seth Streitmatter]

I can't think of any specific sources, but you can easily test using the
same technique with and without a phantom next to the dosimeter and see if
there is any increase in AKR with the phantom in place.  Another way that I
have used is measuring with a 60 cc pancake ion chamber and the solid-state
multisensor simultaneously (you can do this with the Radcal AccuGold
system) with and without a phantom in place.  I assume our solid-state
sensors (Radcal AGMS-DM+) don't include backscatter contribution.  There is
at least a few mm of tungsten backing them and no matter what technique you
use on them, it still shows up as a radiopaque block; I can't speak for the
other vendors' solid-state dosimeters though.  Hope that helps a bit.

-Seth


*Seth W. Streitmatter, PhD, DABR*
Diagnostic Medical Physicist

Assistant Professor

*University of Utah Health*
Radiology and Imaging Sciences

HELIX Tower

30 N Mario Capecchi Dr.  2 South

Salt Lake City, UT 84112

O: 801.581.2271

On Thu, Jul 17, 2025 at 8:18 AM Peter Watson, Mr via
Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu> wrote:

> Hi, I'm wondering if anyone has some references for the effectiveness of
> shielded dose meters (i. e. RadCal AGMS, RTI Piranha, etc. ) for reducing
> the influence of backscatter off of phantoms (PMMA, copper, etc. ) when
> measuring air kerma/ air
> Hi,
>
> I'm wondering if anyone has some references for the effectiveness of
> shielded dose meters (i.e. RadCal AGMS, RTI Piranha, etc.) for reducing the
> influence of backscatter off of phantoms (PMMA, copper, etc.) when
> measuring air kerma/ air kerma rate in diagnostic radiology QA. A quick
> literature search didn't turn anything up, and I thought I would
> crowdsource the listserve before asking my favourite genAI.
>
> Thanks,
> -P
>
> Peter Watson, PhD, MCCPM
> (masculine pronouns)
>
> Medical Physicist, McGill University Health Centre
>
> Assistant Professor, Medical Physics Unit and Department of Oncology,
> McGill University
>
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