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I-125
Pd-103
Cs-131
•
4.6mm long and 0.8mm diameter
•
I-125 adsorbed on silver rod,
encased in titanium
•
Half-life of 59.4 days
•
Energy 27.4 & 31.4keV x-rays
(electron capture) Also 35.5keV
gamma photons
•
4.6mm long and 0.8mm diameter
•
Pd plated graphite pellets 0.9mm
x 0.6mm
•
Titanium end cap
•
Half-life 17 days
•
Energy 20.8 KeV
•
Short half-life (9.7 days) may
provide radiobiological
advantage for some prostate
cancers
•
-ray emitter with highest peaks
from 29 to 34 keV
•
Clinical protocol developed in
Texas Cancer Center by
Prestidge et al.