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Permanent prostate implants
choice of isotopes
•
Low energy photons
•
High nominal specific activity
I125
Pd103
Cs131
Half life (days)
59.4
17.0
9.7
Mean photon energy (keV)
28.4
20.7
30.3
HVL (mm)
0.025
0.0085
0.022
Nominal specific activity
(x10
5
TBqkg
-1
)
6.5
27
38