[Gate-users] Brachytherapy cut-off energy

[xela.errac at gmail.com]

Thank you for you reply Maikol, But that's exactly one of my questions about choosing the right method in Gate.
Do I have to adjust for each material, the distance (SetCutInRegion) to always get this cut in energy of 5 keV or used an energy filter ?

The energy cut-off is defined as follows :
“The energy cutoff, is intended to exclude low-energy or contaminant photons (e.g., characteristic x-rays originating in the outer layers of steel or titanium source cladding) that increase air Kerma rate without contributing significantly to dose at distances greater than 0.1 cm in tis- sue. The value of the energy cuttoff is typically 5 keV for low-energy photon”

Best regards,

Alexandre

> Le 7 mai 2018 à 14:47, Maikol Salas Ramirez <mmsalas at gmail.com> a écrit :
> 
> Hi Alexandre
> 
> I think the cut off is represented by the in Gate by the Production threshold, in Geant4 intead of energy you have to specify a distance for the particle that you are interested.
> http://wiki.opengatecollaboration.org/index.php/Users_Guide:Cut_and_Variance_Reduction_Technics
> 
> Otherwise you can play with a energy killer.
> 
> It depends of the your definition of cut-off.
> 
> Best regards
> Maikol
> 
> 2018-05-07 14:23 GMT+02:00 Alexandre CARRÉ <xela.errac at gmail.com>:
>> In the AAPM 43, they specified a cut off in energy at 5 keV. How can i reproduce this cut off in Gate ?
>> 
>> Best regards,
>> 
>> Alexandre
>> 
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> 
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