4
Dose gradient per mm
0%
5%
10%
15%
20%
0
10
20
30
40
50
60
Distance from tandem (mm)
Dose (%)
Uncertainties in the high
gradient BT dose distribution
Dose profile at level of point A
0%
50%
100%
150%
200%
250%
300%
0
10
20
30
40
50
60
Distance from tandem (mm)
Dose (%)
Radial dose profile
6% pr mm at point A