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TLD: intrinsic energy dependence
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
)0(
)0(
) ( ) (
)0 , (
QMQ TLDD
QMQ TLDD
QQ rel
bq
k
=
Figure from: Attix: Introduction to
radiological physics and radiation
dosimetry, © 2004 by Wiley-VCH Verlag
GmbH & Co
cavity
e l
TLD
X
D
−
arg
1
/
B A C
rel k
bq
=
X
M
Tochilin et al. 1968
Values normalized to Co-60
1
rel
bq
k