Analog simulation: geometry plot and photon dose rate distribution (logarithmic color scale):

1st GVR iteration: importance mesh and photon dose rate distribution (logarithmic color scale):

2nd GVR iteration: importance mesh and photon dose rate distribution (logarithmic color scale):

3rd GVR iteration: importance mesh and photon dose rate distribution (logarithmic color scale):

4th GVR iteration: importance mesh and photon dose rate distribution (logarithmic color scale):