[Gate-users] mu_mass to cross section of physics process for photon

[HUSSAIN KHALID / UPM]

Dear Gate users,

I want to measure the cross sections of different physics process. As
you know, the total cross section is functions of mass attenuation
coefficient, atomic mass unit and relative atomic mass.  sigma_tot=mu_m x u
x A_relative.

If we look on EmCalculatorActor
<https://github.com/OpenGATE/Gate/blob/develop/source/digits_hits/src/GateEmCalculatorActor.cc>,
it gives us mass attenuation coefficient, which I think can be used to
calculate the total cross section but i try to check it for Gallium, the
Gate (EmCalculatorActor) value of mu_m is 1.29864e-20 cm2/g while the value
at  nist
<https://physics.nist.gov/PhysRefData/XrayMassCoef/ElemTab/z31.html>is
8.537E+01
cm2/g, measured at 150keV, I also try to check Gate value of mu_mass with
different energy but still its value is same for Gallium.

Is this value of mu_mass is hard coded for each material?

Is there another way to calculate the mu_mass and is it the correct way to
move towards cross section calculation ?

Is there another way to calculate the cross sections value as total as well
as individual physics process like photoelectric cross section, compton and
rayleigh cross section in Gate ?

Thank you for your help.

Regards
*Khalid*
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