[Gate-users] materials in GATE

Niklas Rehfeld rehfeld at imnc.in2p3.fr
Thu Jul 9 09:49:07 CEST 2009

Dear Ali Asghar,

On Wed, 08 Jul 2009 17:11:45 +0200, AliAsghar Parach <aaparach at gmail.com>

> Dear gate users,
> I have 2 questions about material properties in GATE:
> 1- what means registered couples in GATE running page? and what is the
> difference between registered couples and  Nb of materials that are
> differentially pointed out in GATE running page at each run?

- A G4Material defines the physical properties of a piece of the simulated
world (density, elements etc)

- A G4MaterialCutsCouple includes the G4Material _and_ production cuts.
These cut values are not physically motivated but need to be set for
computational reasons
(for example specifying energy intervals for which cross sections for
particles should be computed). For each G4Region (a set of
G4LogicalVolumes) a different G4MaterialCutsCouples can be assigned.

> 2- in voxelised phantom when i define only one material (eg:Water) in my
> voxel phantom in range.dat file, GATE shows Water,Air,Vacuum in it's  
> running
> page (in registered couples and  Nb of materials). what is it's reason?

There are other volumes in your simulation that are made of Air or Vacuum
(for example the world volume).


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