[Gate-users] Lead not attenuating kV beam?

[Luke Gilling]

Hi guys,

I've been investigating why my field sizes defined in my geometries don't match what is captured by my dose actors. I ran my simulation with 100 primaries and the result can be observed in the image attached. The blue wireframe volumes are lead. As can be seen the first lead volume causes the majority of the attenuation and the remaining lead volumes  seem to have next-to-no effect. The source has a maximum energy of 125 kV and should be easily attenuated by multiple 3 mm lead volumes. But you can see that many photons are passing through all of these volumes.

Has anyone got any clue what is happening here and how I can fix this?

Cheers,

Luke Gilling
Medical Physics Registrar
Lomas Building | Waikato Hospital | Waikato DHB
+64 7 839 8899 x 98242
+64 27 364-2563


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