[Gate-users] LET Actor error?

[Andreas Resch]

Am 2018-11-11 04:34, schrieb chao shan:
> Dear gaters,
> 
>  I tried to get the dose-average LET value for a 62MeV Proton beam
> passing through water.
>  Here is part of my Gate scripts:
> 
>  /gate/actor/addActor LETActor MyActor
> 
> /gate/actor/MyActor/save output/LET_62/myLETactor.txt
> 
> /gate/actor/MyActor/attachTo waterbox
> 
> /gate/actor/MyActor/setResolution 1 1 200
>  /gate/actor/MyActor/setType DoseAveraged
> 
>  It is supposed that the LET-depth curve has its max value around the
> bragg peak region, but the simulation outcome showed that the LET
> curve has another peak at the entry point, which is unreasonable. I
> don't know if this is a bug or something is wrong in my Gate scripts.
> 
> 
>  Thanks,
>  chao.
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Hi,

looks like an effect from secondaries heavier than protons. One would 
expect approximately 1 keV/um (LETd) at he entrance plateau of a 62 MeV 
proton in water. Did you apply a particle filter? Primary and secondary 
protons should be considered only.
/gate/actor/MyActor/addFilter                    particleFilter
/gate/actor/MyActor/particleFilter/addParticle   proton

best,
andreas