[Gate-users] "Dump for solid" problem

[Benoît Collette]

Hello,

I've splited the simulation to don't have an overlapping but my problem 
still exists. The error message is :

-----------------------------------------------------------
    *** Dump for solid - Phantom_S ***
    ===================================================
 Solid type: G4Tubs
 Parameters:
    inner radius : 0 mm
    outer radius : 108 mm
    half length Z: 93 mm
    starting phi : 0 degrees
    delta phi    : 360 degrees
-----------------------------------------------------------
Position:

p.x() = -10.91954980241942 mm
p.y() = -5.601603180160216 mm
p.z() = -42.20623432221317 mm

Direction:

v.x() = nan
v.y() = nan
v.z() = nan

Proposed distance :

snxt = 9e+99 mm


*** G4Exception : Notification
      issued by : G4Tubs::DistanceToOut(p,v,..)
Undefined side for valid surface normal to solid.
*** This is just a warning message.

 *** Break *** segmentation violation
Using host libthread_db library "/lib64/tls/libthread_db.so.1".
Attaching to program: /proc/32511/exe, process 32511

...

-----------------------------------------------------------

Could anyone help me ?

Thanks a lot.


Benoît COLLETTE, M.Sc.
Biomedical engineer

Department of Nuclear Medicine
Erasmus Hospital - University of Brussels (ULB)
808 Route de Lennik
1070 Brussels - BELGIUM
Phone : +32 2 555 7068
Fax : +32 2 555 6800
Benoit.Collette at ulb.ac.be


Benoît Collette a écrit :
> Hello,
>
> I'm using GATE v. 4.0.0 and I'm trying to modelise a Jaszczak SPECT 
> Phantom Deluxe ( http://www.biodex.com/radio/phantoms/phantoms_750.htm 
> ). The geometry I've created is very simple : a cylinder containing 
> activity and, inside the cylinder, 6 spheres also containing activity. 
> But, the execution is stopped and I receive error messages (see 
> "testVG.output"). I think it's linked with the overlaping of the 
> source in the cylinder and the sources in the spheres. But I don't 
> know how to do this otherwise ...
>
> Could somebody explain me how to define a source with a geometry like 
> a cylinder extruded for the spheres ? Or how to do this otherwise with 
> the version 4.0.0 ?
>
> Thanks a lot.
>
>
>
> Benoît COLLETTE, M.Sc.
> Biomedical engineer
>
> Department of Nuclear Medicine
> Erasmus Hospital - University of Brussels (ULB)
> 808 Route de Lennik
> 1070 Brussels - BELGIUM
> Phone : +32 2 555 7068
> Fax : +32 2 555 6800
> Benoit.Collette at ulb.ac.be