|Message: How to Get a Lateral Dose Profile||Not Logged In (login)|
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Hi I am new in G4 and currently I want to simulate and get a lateral beam profile. The geometry setup is just a simple box 20*20*20 cm and 200 copy array detector (sensitive detector) in Y-axis ( 100mm*1mm*0.1mm ).
By the way I can get the energy deposit in the detector and plot a graph. The source is carbon ion (290*12)MeV from Z-axis. using Angular distribution method spread out the beam.
BeamEnergyPattern() is monoenergetic and using CLHEP::RandFlat::shoot(0., twopi); Below is the code for the momentum
G4double cosTheta= CLHEP::RandFlat::shoot(cos(100 mrad), 1.); G4double phi2= CLHEP::RandFlat::shoot(0., twopi); G4double px= momentum* sqrt(1.-cosTheta*cosTheta)* cos(phi2); G4double py= momentum* sqrt(1.-cosTheta*cosTheta)* sin(phi2); G4double pz= momentum* cosTheta; G4PrimaryParticle* primaryParticle = new G4PrimaryParticle(particle, px, py, pz);
But many times I have trying still cannot get a flat lateral dose distribution, may know what is the problems?
Here I attach the graph of the dose profile. Thanks
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