[Gate-users] PENELOPE vs STANDARD model

[Giuseppe Magro]

Dear Gaters,

    thanks to PenelopeModel for the Physics we were able to reproduce the
experimental data with good agreement (see MCvsDATA in the attachment). The
choice of Penelope was dictated by the need of having photopeaks as in the
detected spectrum, which were not observed by choosing the StandardModel
for the Physics.

    Now we are faced with another problem. The selection of primaries and
non-primaries photons is done through the following lines in ROOT:

    if (comptonPhantom == 0 && comptonCrystal == 0){

        hist_primary.Fill(energy);

    }

    if (comptonPhantom != 0 || comptonCrystal != 0){

        hist_non_primary.Fill(energy);

    }

as shown in more than one example which GATE offers.

    The results obtained with PenelopeModel or StandardModel activated
present some inconsistencies , as you can see by comparing the attachments
PENELOPE vs STANDARD. In particular we don't understand why the counts
under the peak at 0.72 MeV (obviously coming from PhotoElectric in Lead)
are classified as primaries as well as the part of the spectrum connecting
this peak to the primary one at 0.145 MeV (obviously a compton component).

    Thanks for your attention.

    Regards.

-- 

Giuseppe Magro

> beppe.magro at gmail.com <
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