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TLD: absorbed dose energy dependence
)0(
)0(
) (
) (
)0 , (
Q TLDDQwD
Q TLDDQwD
QQ rel f
Best practice example for I-125 dosimetry with 6
MV linac calibration:
•
f
rel
is close to 0.7 but varies with point around
the source
•
Uncertainties: Type A=0.56%, type B=1%
Neglecting f
rel
would introduce a type B uncertainty
(dose overestimation) of 40%...!
M t t
t l E i
t l d t
i ti
f th T k G 43 d i t i
t
f
ou sa sos e a . xper men a e erm na on o e as roup-
os me r c parame ers o
the new I25.S17plus (125)I brachytherapy source, Brachytherapy, 13(6), 618 (2014).