00001 # GPS Cobalt60 source
00002 #
00003 # Introduction:
00004 # 60Co emits 2 gammas in coincidence, one of 1.33 MeV and one of 1.17 MeV energy
00005 # In many cases, "pile-up" of these 2 photons in the detector in a single event
00006 # can be neglected. Examples are:
00007 # - if the detector is reasonably far from the 60Co source
00008 # - if no "event-by-event" analysis is needed (only cumulative effects are studied)
00009 # In this cases, the source can be described as 2 separate sources: one at 1.33 MeV,
00010 # the other at 1.17 MeV
00011 #
00012 # There are 2 options for the modelling of the source:
00013 # 1. The 2 gamma lines can be modelled separately.
00014 # The simulations results can be combined as post-processing
00015 # 2. The 2 gamma lines can be modelled together.
00016 # GPS will randonly select one or the other, depending on the relative intensity
00017 #
00018 # Description:
00019 # - Point source, centred in (0.,35.,0.) cm
00020 # - Monoenergetic lines: 1.17 MeV or 1.33 MeV
00021 # - Isotropic emission, 4PI
00022
00023 # Modelling of 2 sources in parallel for the 2 gamma lines here:
00024
00025 # Optional:
00026 # execute macro for advanced visualisation
00027 # NB: to be executed only once during simulation, otherwise the program will crash
00028 #
00029 # /control/execute vis_cobalt60_2sources.g4mac
00030
00031 # First 60Co line at 1.17 MeV
00032
00033 # Particle type
00034 /gps/particle gamma
00035
00036 # Energy
00037 /gps/ene/type Mono
00038 /gps/ene/mono 1.17 MeV
00039
00040 # Position
00041 /gps/pos/type Point
00042 /gps/pos/centre 0. 35. 0. cm
00043
00044 # Angular distribution:
00045 /gps/ang/type iso
00046 /gps/ang/minphi 0. deg
00047 /gps/ang/maxphi 360. deg
00048 /gps/ang/mintheta 0. deg
00049 /gps/ang/maxtheta 180. deg
00050
00051 /gps/source/intensity 1.
00052
00053 # Second 60Co line at 1.33 MeV
00054
00055 /gps/source/add 1.
00056
00057 # Particle type
00058 /gps/particle gamma
00059
00060 # Energy
00061 /gps/ene/type Mono
00062 /gps/ene/mono 1.33 MeV
00063
00064 # Position
00065 /gps/pos/type Point
00066 /gps/pos/centre 0. 35. 0. cm
00067
00068 # Angular distribution:
00069 /gps/ang/type iso
00070 /gps/ang/minphi 0. deg
00071 /gps/ang/maxphi 360. deg
00072 /gps/ang/mintheta 0. deg
00073 /gps/ang/maxtheta 180. deg
00074
00075 #
