[Gate-users] Missing Lu177 X-ray peak with Gate Version 8?

Cassandra cassandramiller at phas.ubc.ca
Fri Jul 26 19:10:20 CEST 2019

Hi everyone,

Quick question about simulating Lu-177 in Gate version 8.0/8.1 vs. Gate 
version 7.0. I have been using version 7 until now, but I noticed when I 
switched to version 8 and 8.1, the x-ray peak around 50-60 keV peak is 
missing from the Lu-177 energy spectrum in ROOT. Does anyone know why 
this is missing and if there is an additional line I need to include in 
my macro file to get it? Here is what I have currently:


/gate/physics/addPhysicsList empenelope
/gate/physics/addProcess RadioactiveDecay
/gate/physics/processList Enabled
/gate/physics/processList Initialized

and for Lu177:

/gate/source/addSource lutetium gps
/gate/source/lutetium/gps/particle ion
/gate/source/lutetium/gps/ion 71 177 0 0
/gate/source/lutetium/gps/energytype Mono
/gate/source/lutetium/gps/monoenergy 0. MeV
/gate/source/lutetium/setForcedUnstableFlag true
/gate/source/lutetium/setForcedHalfLife 574560. s
/gate/source/lutetium/setActivity 100.e6 Bq
/gate/source/lutetium/gps/type Volume
/gate/source/lutetium/gps/shape Sphere
/gate/source/lutetium/gps/radius 4.0 cm
/gate/source/lutetium/gps/angtype iso

I've also attached the two spectra, these are spectra from a sphere 
filled with Lu-177 inside a cylinder (note that these are different 
simulated activities so the counts are much different, but it's the same 
size sphere in the same size phantom). As you can see the spectra are 
different! Any guidance on why this is happening or how to fix it would 
be appreciated.

Thank you!


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