Advanced Physics for Brachytherapy 2018

Radiochromic films: basic principles

Diacetylene molecules in a w. sol. polymer matrix coated on a polyester substrate induces polymerization of diacetylene molecules to form polydiacetylene dye polymers (self-developing) These are blue in color and cause light absorbance (mainly) in the other parts 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 Radiation

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OD=log(1/T)=log(I 0 /I T )

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Figure from: Devic, Physica Medica 27(3) 122 (2011)