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Radiochromic films: basic principles
•
Diacetylene molecules in a
gelatin matrix coated on a
l t b
po yes er ase
•
Radiation
induces
polymerization of diacetylene
molecules
to
form
polydiacetylene dye polymers
(self-developing)
•
These are blue in color and
cause light absorbance in the
red part of the visible
spectrum
•
The change in net OD is
measured using flat-bed
scanners employing broad
band visible light sources and ,
correlated to dose
Figure from: Devic, Physica Medica 27(3) 122 (2011)