CPB Ljubljana 2018 course book

Dose from Dose-Rate: Dose Accumulation over Time

. . (1 − − ൗ )

,

= ሶ

, , 0

1,0

0,9

0,8

Total Dose (100% = 1.0)

0,7

0,6

125 I 103 Pd 131 Cs

0,5

• 145 Gy • 125 Gy • 115 Gy

0,4

0,3

0,2

0,1

0 20 40 60 80 100 120 140 160 180 200 220 0,0

Accumulated Dose as fraction of Total

Days after Implantation

• Initial Dose Rate (at the prostate surface) 30 cGy.h -1 for 131 Cs versus 7 cGy.h -1 for 125 I and 20 cGy.h -1 for 103 Pd