361 / 1228
Type B uncertainty … input
Phantom geometry (for single source dosimetry)
Remember dose from scatter depends on geometry dimensions…!
or patient segmentation and source/applicator position (for patient dosimetry)
Geometry in simulation for S
K
(for single source dosimetry)
In order to comply with the definition of S
K
:
Ai ( i t) d t t t l
di t
f
th
i
•
r po n e ec or a arge s ance rom e source n vacuo
•
Photon emissions of energy lower than δ=5 keV (i.e. characteristic x-rays of Ti
encapsulation following photoelectric absorption of 125I photons) must be
suppressed.