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TLD: absorbed dose energy dependence
)0(
)0(
) (
)
(
)0 , (
Q TLDDQwD
Q TLDD
QwD
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%...!
Moutsatsos et al. Experimental determination of the Task Group-43 dosimetric parameters of the new
I25.S17plus (125)I brachytherapy source, Brachytherapy, 13(6), 618 (2014).