[Gate-users] Basic Spectrum definition

[Niels van der Werf]

Dear all,

For a SPECT simulation I’m trying to use a discrete spectrum. While performing a NEMA test, I noticed that my sensitivity measurements were incorrect.

The reason for is probably related to my spectrum definition. I currently use a discrete spectrum for, for example, Indium-111. My spectrum.txt file is build up as follows:

1 0
0.245 0.940
0.171 0.905

The problem is that the probabilities are normalized by Gate, however, both occur upon a decay. So, Gate should not make a choice between the two energies, but both should be given for the same decay.

Has anyone encountered this before, and does he/she know a solution for this?

Thank you for your help!

Best regards,
Niels