[Gate-users] septa penetration

[Simon Stute]

Hi,

2010/3/4 Cláudia Régio Brambilla <claudinha.rb at gmail.com>

> Hi gate users,
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>
>
> I have two questions:
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> 1-      Does anybody knows if gate 5 or 6 could simulate septa penetration?
>

Of course, Gate is a Monte Carlo tool !
But to know it I think you have to put a point source of gamma (with the
energy of your choice) in the center of a Lead cube and then calculate the
mean distance between the point source and the position of final interaction
of your gammas.


> Or Are the events absorbed when it hits in a Pb material collimator?
>

No of course, why it should ?


>
> 2-      Is it possible to introduce any command to force absorb event when
> it hits on shielding to reduce the time of the simulation?
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>

I am also thinking about that now and considering my very little
understanding of physics around particle transport in matter, I think we can
approach this by defining a new element with a very high Z and a new
material made of this element with a very high density. As photoelectric
usually depends on Z^4 and compton only on Z, by setting a very high Z you
maximize the probability of photoelectric much larger than for compton. But
I havn't tested it yet !
And if anybody more experienced in this domain can correct or confirm this,
it would be great !

But if you use Gate_v6 there is also  the possibility to easily assign a
very high cut for gamma in your collimator volume, it is much more
convenient !

Cheers,
Simon


>
> Thanks for help,
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>
>
> regards
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> __________________________________
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>
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> Cláudia Régio Brambilla
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>
>
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