Advanced Physics for Brachytherapy 2018

Modern Radiation Therapy

BRT versus ERT Similarities and Differences

Dosimetric Kernel

BRT

BRT

1/r 2 = 0.007 ➔ 0.7%

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0

20 keV 25 keV 30 keV 40 keV 50 keV 60 keV 70 keV 80 keV 90 keV

100 keV 150 keV 200 keV 300 keV 400 keV 667 keV

100 keV

60 keV

Yb-169

80 keV

Ir-192

50 keV

40 keV

20 keV

30 keV

Radial Dose Fucntion g(r)

Dose Rate Normalized to 1.0 cm

0

2 4 6 8 10 12 14 16

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Radial Distance (cm)

Radial Distance (cm)