Clear Perspex Dosimetry

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Abstract
Radiation dosimetry using induced optical changes in clear Perspex has been investigated with particular reference to the effect of contaminants. It was found that the changes in optical absorption depended upon the initiator used in polymerization and the concentration of residual monomer. The formulation of a Perspex suitable for dosimetry is discussed. The fading of the induced absorption has been also studied and found to depend on the benzoyl peroxide concentration, the dose, and the wavelength at which spectrophotometric measurements are made. If aged in air after exposure this fading was shown to be dependent upon the diffusion of oxygen into the samples.