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Forum: Space Applications
Re: Question Simulating and calculating Geometric Factors in GEANT4 (Bruno Morgado)
Re: Idea Re: Simulating and calculating Geometric Factors in GEANT4 (Laurent Desorgher)
Date: 08 Oct, 2012
From: Bruno Morgado <Bruno Morgado>

Hi Laurent, thank you for you answer. I found out that original expressions was indeed wrong, but the one I found after is also different from yours.

The expressions I found for the Geometric Factor G, is:

G = (Nc/Ne) * 4 * Pi^2 * R^2

where: Nc = Number of captured particles Ne = N. emitted particles R =Source radius

I came to this by using a paper from Sullivan, 1971.

The Counting rate C is related to the Isotropic source intensity (I0) by: C = G * I0

Excluding any time dependency, the Intensity becomes the number of emitted, and captured particles.

If I define a source sphere where the particles are only emitted inwards, then the solid angle, O, comprised by those particles is: O = Pi

and the source intensity becomes: I0 = Ne / (S * O) = Ne / (4 * Pi^2 * R^2)

where: S = Surface area

and using the definition of G from Sullivan, I arrive at the GF I've given before.

All the best, Bruno

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1 None: Re: Simulating and calculating Geometric Factors in GEANT4   (Laurent Desorgher - 08 Oct, 2012)
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