Physics Bucharest 2017
photon-electron junctions
SSD= 100 cm electrons: applicator-skin= 5 cm 6 MV 10 MeV
SSD= 110 cm electrons: applicator-skin= 15 cm 6 MV 10 MeV
photons 1 photons 2 photons 3 electrons 1 electrons 2 electrons 3
photons 1 photons 2 photons 3 electrons 1 electrons 2 electrons 3
100
100
80 SSD=110 cm for electrons makes the problem of matching electron and photon beams depth independent 80
60
60
40
40
20
20
0
0
-30 -20 -10 0 10 20 30 40 50
-30 -20 -10 0 10 20 30 40 50
- reduced dependence electron beam penumbra on depth - electron beam penumbra more shallow
- strong dependence electron beam penumbra on depth
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