Physics Bucharest 2017

Comparison of central axis depth doses at two source- surface distances (Philips SL75/10) The inverse square law is only “fully compensated at D max ” The scatter differ due to different divergence

100

3% @ 10 cm depth

% dd

8 MV

50

100 cm SSD

142 cm SSD

0

2

10

5

depth in phantom (cm)