[Gate-users] Z position

[venialgo_e]

I changed Z lenght by:

/gate/cristalIoduro/geometry/setZLength 2 cm
/gate/cristalIoduro/placement/setTranslation  0 0 -1 cm

and I have exactly the same histogram.
P.D.: I attached the new macro file and histogram.


Esteban Venialgo


"Chen, Yu" <Yu.Chen at umassmed.edu> ha escrito:

> The peak in bottom is due to your geometry setting: the sensitive   
> detector is the same as
> world size at -z, then no photons can escape your SD. You need to   
> set your world size in z
> slightly bigger.
>
> None of your three plots makes sense to me. Maybe next time you can   
> look only those with
> small globalPosX, Y events.
>
> Yu Chen, Ph.D.
> University of Massachusetts Medical School
> Division of Nuclear Medicine
> 55 Lake Avenue North
> Worcester, MA 01655-0243
> Phone:  (508) 856-6123
> Fax:    (508) 856-4572
>
>
>
> -----Original Message-----
> From: gate-users-bounces at lists.healthgrid.org on behalf of venialgo_e
> Sent: Thu 2/14/2008 8:16 AM
> To: gate-users at lists.healthgrid.org
> Subject: [Gate-users] Z position
>
> Hello Gate users,
>
> I'm studying the effect of Depth Of Interaction in a crystal of NaI. I
> simulated a detector of 30cm x 40 cm x 2.5 cm using a source with
> several emission angles.
>
> the detector is:
>
> /gate/scanner/daughters/name cristalIoduro
> /gate/scanner/daughters/insert box
> /gate/cristalIoduro/geometry/setXLength 5 cm
> /gate/cristalIoduro/geometry/setYLength 5 cm
> /gate/cristalIoduro/geometry/setZLength 2.5 cm
> /gate/cristalIoduro/placement/setTranslation  0 0 -1.25 cm
> /gate/cristalIoduro/setMaterial NaI
> /gate/cristalIoduro/vis/setColor red
> /gate/cristalIoduro/attachCrystalSD
>
>
> the source is:
>
> /gate/source/addSource cesio
> /gate/source/cesio/setActivity 20000 becquerel
> /gate/source/cesio/gps/centre 0. 0. 1 cm
> /gate/source/cesio/gps/particle gamma
> /gate/source/cesio/gps/energytype Mono
> /gate/source/cesio/gps/monoenergy 0.622 MeV
> /gate/source/cesio/gps/type Volume
> /gate/source/cesio/gps/shape Sphere
> /gate/source/cesio/gps/radius 0 cm
> /gate/source/cesio/gps/angtype iso
>
>
> 1)In the first case the emission angle is:
> /gate/source/cesio/gps/mintheta    0. deg
> /gate/source/cesio/gps/maxtheta    0. deg
> /gate/source/cesio/gps/minphi      0. deg
> /gate/source/cesio/gps/maxphi      360. deg
>
> 2)In the second, it is:
> /gate/source/cesio/gps/mintheta    0. deg
> /gate/source/cesio/gps/maxtheta    3. deg
> /gate/source/cesio/gps/minphi      0. deg
> /gate/source/cesio/gps/maxphi      360. deg
>
> 3)In the last, it is:
> /gate/source/cesio/gps/mintheta    0. deg
> /gate/source/cesio/gps/maxtheta    20. deg
> /gate/source/cesio/gps/minphi      0. deg
> /gate/source/cesio/gps/maxphi      360. deg
>
>
> And The questions about Z positions of the singles are:
>
>
> 1)In the first case , why are there a lot of counts only on the
> crystal's top face?.
>
> 2)In the second case, why are there more counts in one half of the
> crystal than the other?
>
> 3)In the third case. why is there a peak of counts, in the crystal's
> bottom face ?.
>
>
> P.D.: I attached the macro files for each case, and gif files with the
> Z position's histograms  of the singles, also.
>
>    Thanks in advance,
>
>    Esteban Venialgo
>
>
>
>
>
> ----------------------------------------------------------------
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>
>
>



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