A new label dosimetry system based on pentacosa-diynoic acid monomer for low dose applications

The dosimetric characteristics of γ-radiation sensitive labels based on polyvinyl butyral (PVB) and a conjugated diacetylene monomer, 10,12-pentacosa-diynoic acid (PCDA) have been investigated using reflectance colorimeter. Two types of labels (colourless and yellow) based on PCDA monomer were prepared using an Automatic Film Applicator System. Upon γ-ray exposure, the colourless label turns progressively blue, while the yellow colour label turns to green then to dark blue. The colour intensity of the labels is proportional to the radiation absorbed dose. The useful dose range was 15 Gy–2 kGy depending on PCDA monomer concentration. The expanded uncertainty of dose measurement of the colourless label was 6.06 (2σ).

► Using 10,12-pentacosa-diynoic acid (PCDA) in preparation of label dosimeter.
► PCDA polymerises upon γ-rays exposure producing a blue coloured polymer.
► Useful dose range is 15 Gy to 2 kGy depending on concentration of PCDA.
► Overall uncertainty of label dosimeter was 6.06 at 2σ.