Advanced Physics for Brachytherapy 2018

Radiochromic films: rel. E response

)0( Q TLDDQwD Q TLDDQwD bq k ) (

) (

( Q TLDD

)0( )0( QMQ TLDD QM ) ( )

rel f

QQ rel

)0 , ( =

QQ

)0 , ( =

)0(

• Bekerat et al (2014) indicate different marketed versions of EBT3 and report: • no relative energy dependence of the latest EBT3 between Ir-192 and Co-60 (albeit for 3cm film-source distance in a parallel-opposed Ir-192 HDR irradiation setup) • an under response ( ) at all energies <100 keV, varying from 20% ± 4% at 20 keV to ± 4% at 40 keV. 1  rel bq k rel f

Figure from: Bekerat et al, Medical Physics 41(2) 022101 (2014)