Volumetric source with multiple isotopes

Source Definition
1

Versions

Please provide the used software versions.

FLUKA:
Flair:

Description

Dear Fluka experts,

I am currently working on a simulation of an HPGe detector calibration (gamma spectrometry). My goal is to model a volumetric source: a solid resin cylinder containing a uniform distribution of several radionuclides with known activities.

I have managed to simulate a single isotope using the HI-PROP and RADDECAY cards. However, I am looking to simulate a mixture of multiple isotopes within the same volume.

Thank you for your help!

Input files

Please upload all relevant files. (FLUKA input file, Flair project file, user routines, and data files)

60-Co_Volum.inp (3.9 KB)

60-Co_Volum.flair (4.9 KB)

2

Dear Guillaime,

I see two possible ways to simulate a mixture of isotopes:

  • You could simulate the isotopes separately and merge the results afterward, or
  • Use a source routine to have different isotopes in a single run.

Cheers,
David

4

Dear Dávid,

Thank you for your response. What solution would you advise me to use, knowing that I have 11 different isotopes contained in a solid resin cylinder?

I would also like to ask if the correct way to define a volumetric source is by using two BEAMPOS cards. The first one, set to point, to specify the position of the source. And the second one, set to CYLI-VOL, to define the cylinder’s dimensions.

Best regards.

5

Dear Guillaume,

If the activities of the isotopes are fixed and they won’t change later on, then a source routine could be the more convenient option. However, in that case, you need to sample the volume in the source routine, since the volumetric source defined in the FLUKA input is not used by the source routine.

If the activities would change later on, then separate simulations would allow you to get results without running new simulations.

Cheers,
David