[Gate-users] definition of a pencil beam source

[‪Hadis Shahrabi‬ ‪]

Hi all,I need to know how a pencil beam source is defined by the following characteristics?If anyone can explain me how I aprecciate itThank you
# spot size

/gate/source/PBS/setSigmaX [spot_size_X]  mm
/gate/source/PBS/setSigmaY [spot_size_Y]  mm

#divergence

/gate/source/PBS/setSigmaTheta [divergence_Teta] mrad
/gate/source/PBS/setSigmaPhi [divergence_Phi]    mrad

#emittance

/gate/source/PBS/setEllipseXThetaEmittance [Emittance_X_Theta] mm*mrad
/gate/source/PBS/setEllipseYPhiEmittance [Emittance_Y_Phi]     mm*mrad

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