Liquid-core optical waveguide dosimetry ageing of a dosimeter with sub-linear response

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Abstract

The simple dosimeter system: LED-liquid optical waveguide dosimeter-neutral OWG-photodiode shows a sublinear response of absorbance vs absorbed dose due to the polychromaticity of the light source. It is shown that if the sensitivity of measurement is high and the “dosimetric” reaction in unirradiated compound takes place spontaneously with time (ageing), the use of a system with sublinear response can hardly be advised. This has been demonstrated with a solution of hexahydroxyethyl pararosaniline cyanide for which, based on the separately determined G-value and molar absorption coefficient, the theoretical behavior of the system in the gamma radiation field has been derived.

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