Dear, G4 User
I am analysing the detector signal using the Cs-137 source term.
I registered ‘RadioactiveDecayPhysics’ in the physics list and here is a snippet of the .mac file that defines Cs-137.
# Macro file: run.mac
/run/verbose 1
/tracking/verbose 1
# gps example (isotropic gamma point source, 1 MeV at origin)
/gps/particle ion
/gps/ion 55 137
/gps/pos/type Point
/gps/pos/centre 0 0 0 cm
/gps/direction 0 0 -1
/gps/ene/type Mono
/gps/ene/mono 0 eV
#/gps/ang/type iso
#/gps/energy 3.0 MeV
/run/beamOn 10
Currently, the process of Cs137 decaying to Ba137m and emitting 662 keV gamma can be observed ‘intermittently’ via verbose.
As far as I know, this decay process occurs 85% of the time, but 662 keV gamma rays are only observed occasionally.
Therefore, if we increase beamOn significantly and observe the fraction, we get 662 keV emitted, which is roughly 12%.
The physicslist I defined is shown below.
// EM Physics
RegisterPhysics(new G4EmStandardPhysics_option3());
// Decay
RegisterPhysics(new G4DecayPhysics());
// Radioactive decay
RegisterPhysics(new G4RadioactiveDecayPhysics());
Please share your knowledge and experience with this phenomenon.
Best
Junsung
Geant4 Version: geant4-10-07-patch-03
Operating System: window-WSL
Compiler/Version: 11.3.0
CMake Version: 3.22.1