Abstract
Chloroform in the FlexyDos3D dosimeter acts as a radical initiator which brings about the colour change of the dosimeter when the radicals react with the leucomalachite green. However, the volatility of the chloroform likely results in a rapid loss of chloroform from the dosimeter. Gravimetric analysis and NMR diffusion-ordered coherence spectroscopy were used to measure the diffusion and evaporation rates of chloroform from the dosimeter and found that both rates were both significantly large resulting in a rapid loss of chloroform. Dose maps of irradiated phantoms aged for different times found a significant difference in the dose measurements of the dosimeter, likely a result of the different chloroform concentrations within the dosimeters.
Highlights
IntroductionThe FlexyDos3D dosimeter consists of an optically-transparent silicone elastomer (Sylgard® 184, Merck), chloroform, and a leucodye, leucomalachite green (LMG)
Chloroform in the FlexyDos3D dosimeter acts as a radical initiator which brings about the colour change of the dosimeter when the radicals react with the leucomalachite green
The FlexyDos3D dosimeter consists of an optically-transparent silicone elastomer (Sylgard® 184, Merck), chloroform, and a leucodye, leucomalachite green (LMG)
Summary
The FlexyDos3D dosimeter consists of an optically-transparent silicone elastomer (Sylgard® 184, Merck), chloroform, and a leucodye, leucomalachite green (LMG). The chloroform is used to produce radicals when irradiated that will react with the LMG, converting the LMG to malachite green (MG). This conversion of LMG to MG will result in the dosimeter changing from crystal clear to green. Evaporation of chloroform from the FlexyDos3D dosimeter would likely result in less radicals being produced when the dosimeter is irradiated, resulting in less colour change in the dosimeter. This would likely lead to spatial differences in the chloroform distribution within the dosimeter.
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