Hi everybody!

I am interested in simple questions of radioprotection, like how does the beam change after passing a certain material. I want to analyse the dose and energy spectrum before and after the attenuation.

The dose could be simulated with egs_chamber. But how can I get the spectrum at a point/plane?

Is there a possibility to simulate the dose and spectrum in one file?

Hi,

I am trying to simulate the absorbed dose in a small box as a function of the box size with egs_chamber. The different box sizes are realized by a loop. To reduce the computing time I used “Intermediate Phase-Space Scoring”. In the egs_chamber example I found this part of code:

:start calculation geometry:

geometry name = phsp_scoring_geometry

cavity regions = 1 5

cavity mass = 1

cavity geometry = air_chamber_tube

enhance regions = 0 1 4 5

enhancement = 128 128 128 128

:start transformation:

translation = 0 0 -100.001

:stop transformation:

:stop calculation geometry:

What does the transformation do? Is it always necessary to use it? And what distance do I have to apply?