902 / 1228
TLD: sensitivity/linearity
i
ff i
i
f i
i
i h
•
TLD s e ect ve n terms o nteract ng w t
photons in the brachytherapy E range
•
The TL mechanism however is inefficient
•
About 0.04% of TLD absorbed dose is emitted
as TL energy per unit mass
•
Individual TLD calibration is required as well as
meticulous care in reproducible conditions of
use to ensure precision/accuracy
•
TLD dynamic dose range is wide. It comprises a
linear D region followed by a region of supra-
linearity and eventually saturation
,
,
•
Linearity cannot be assumed and has to be
measured by irradiating TLD groups in graded
doses in the region of interest
Table from: Mayles, Nahum, Rosenwald (Eds): Handbook of radiotherapy physics: theory and practice,©
2007 by Taylor & Francis Group LLC