AQUEOUS PHENYLACETIC ACID AS A LOW-DOSE FLUORESCENCE DOSIMETER

Total fluorescence of aqueous phenylacetic acid system at neutral pH h as been evaluated as low-dose gamma-ray chemical dosimeter, using the fluorescence accessory of a UV-Vis spectrophotometer. The useful worki ng range of the system is from 4 to 70 Gy. The postirradiation stabili ty of the dosimeter response has been studied at different pH's, stora ge temperatures and light conditions. The post-irradiation stability o f the dosimeter decreases with an increase in storage temperature. The stability is not affected in diffuse sunlight but it is very unstable in direct sunlight.