Problem 751 - How to define singular atomic impurities?
Summary: How to define singular atomic impurities?
Status: RESOLVED INVALID
Alias: None
Product: Geant4
Classification: Unclassified
Component: materials (show other problems)
Version: 7.0
Hardware: PC Linux
: P2 major
Assignee: Michel.Maire
URL:
Depends on:
Blocks:
 
Reported: 2005-06-09 04:44 CEST by dgarciag
Modified: 2005-06-09 06:10 CEST (History)
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Description dgarciag 2005-06-09 04:44:55 CEST
Hello!
i am interested in simulate a material with atomic impurities perfectly located
of a certain material. How can i do this in geant4?. Is G4 able to do this in an
easy way?

thank you very much!
Comment 1 Michel.Maire 2005-06-09 05:49:59 CEST
The materials are assumed homogenerous, isotrope, amorphous.

Impurities must be introduced via a geometrical volume.
Comment 2 dgarciag 2005-06-09 06:10:59 CEST
Dear Michel,

Thanks for your quick answer.
What I would like to simulate is the following:
an Aluminium plate (5 cm^2 surface x 2 mm thick)
with a given number of SINGLE athoms of a given element (Pb for instance)
spread inside the Aluminium plate.
(then I will send protons through the plate to study the stopping power
of this mixture).

The important point is that the Pb athoms are INDIVIDUALLY
spread inside the Aluminium, they do not group, each Pb athom
appears surronded by Al athoms

The question is which is the best way to simulate this medium.

In order to really simulate the single Pb athoms I think we could
define the medium as follows:

1) define a cube of Al of a given size (20 x 20 x 20 nm^3)
2) define a very small sphere of Pb inside this cube of a given size,
proportional to the density of impurities (Pb) we want to simulate.
For instance 5 nm radius.
3) Replicate this geometry many times.

Does it make sense ? Do you think this is the best way to simulate it ?
May be it is a way to simulate single athoms ...

Many thanks for your help,

Diego