APBI 2016

Effect of inverse square law on dose

100 110

Ref. point distance = 100 cm

0 10 20 30 40 50 60 70 80 90

Teletherapy

D=100 % Ref. point

source

ref. point distance distance

Brachytherapy

Realative dose value (%)

Ref. point distance = 1 cm

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0

Distance from reference point (cm)