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None Re: over-estimation of HPGe detector efficiency 

Forum: Geometry
Re: None over-estimation of HPGe detector efficiency (Neha Dokania)
Date: 22 Jun, 2011
From: Marc Verderi <Marc Verderi>

Hello Neha,

I am not completely sure I understand your case, but in the situation 
you describe, I believe you need to do a simple placement of your 
cylinder inside your detector. This cylinder can be full (not hollow).

For example, assuming
     - your material in the world volume is air
     - your detector is a box, placed directly in the world volume
     - and the hole is air
you can implement you setup with:
     . create the world volume, fill it with air
     . create your detector box (G4Box), create the detector box 
G4LogicalVolume passing this box and the material (Ge ?) as arguments, 
place this G4LogicalVolume in the world volume using a G4PVPlacement;
     . create the hole (G4Tubs), create the hole detector 
G4LogicalVolume passing this tubs and giving "air" as the material, and 
then place this hole G4LogicalVolume cylinder into the detector box 
G4LogicalVolume, using a G4PVPlacement.

You will have the volume hierachy : hole placed in detector placed in 
world volume.

Then at tracking time, when the G4Track is in the detector box, but not 
in the hole, it will see the Ge as the current material, and when in the 
hole of the detector, it will see the air as current material. You don't 
need any "or" condition in your stepping action.

Does it answer your question ?

Cheers,
Marc

Le 31/05/2011 13:05, Neha Dokania a écrit :
> *** Discussion title: Geometry
>
> I am constructing a coaxial detector of length 64mm with a hole of depth
> 47mm.For that I am using a solid and a hollow cylinder respectively and
> keeping the former on the latter .Is it better to use subtraction solid
> as in stepping action I am giving the "or" condition of energy
> deposition between the two of them ?
>
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