Advanced Physics for Brachytherapy 2018

TLD: intrinsic energy dependence

)0( QMQ TLDD QMQ TLDD ) ( ) (

k

QQ rel

)0 , ( =

bq

Tochilin et al. 1968 Values normalized to Co-60

)0(

D

  

  

TLD X

X M

cavity e l −

arg

1

/ B A C

= 

rel k

bq

It was well known that dose to TLD to produce a unit signal decreases as energy decreases and LET increases i.e.: @ the brachy energies or equivalently: TLD over-responds (more signal per unit dose) at lower energies due to LET increase 1  rel bq k

Figure from: Attix: Introduction to radiological physics and radiation dosimetry, © 2004 by Wiley-VCH Verlag GmbH & Co