Poly (vinyl butyral) combined with 4-(p-nitrophenyl-azo)-1-naphthol has been examined to be a dosimeter suitable for applications in the high dose range. Different concentrations were prepared to obtain the suitability of the dosimeter in the dose range 5-100 kGy in which the yellow color of the dye was bleached. Magnesium chloride was then added and its effect on the response was studied. The response is independent on the variation of relative humidity during irradiation. The radiation chemical yield for the prepared films was calculated. Films reveal excellent stability before and after irradiation. Optical energy gap was determined and the effect of gamma radiation on its value was studied.

Sayeda E Eid, Seif E Ebraheem and Asmaa Sobhy