Advanced Physics for Brachytherapy 2018
Radiochromic films: rel. E response
) ( Q TLDDQwD
) (
D
Q MQ TLD
) ( ) (
rel
rel
k
Q
Q
)0 , ( =
f
)0 , ( =
bq
( )0( Q TLDD
QM
)0
D
Qw
Q
)0(
(
)0
TLDD
• Investigators reported inconsistent results of rel. E response. • E.g.: for EBT3 Brown et al (2012) used synchrotron mono-chromatic x-rays and found up to 3% dose over-response ( ) at low E (25-35 keV) while Massillon-JL et al (2012) reported under-response up to 13% for 50kVp beams. 97. 0 = rel bq k rel f
• It became apparent that manufacturing and compositional changes do take place, that are not always accompanied by updates to the film model or label (!!!)
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