IRRADIATE ' POLYMERIC FILMS AND ITS POSSIBLE APPLICATION FOR RADIATION DOSIMETRY

Abstract

The aim of the present thesis is the development•of a new polymeric films, laboratory prepared by simple uncouthly methods through dying them with different types of dyes. First unit containing three films were prepared by casting polymeric solution of poly(vinyl chloride). First film was prepared by dying poly (vinyl chloride) film with Eosin dye. This flexible plastic film dosimeter is bleached when exposed to y-ray photons at low doses (2-7 kGy) indicating their suitability for eventual application in food irradiation processing. Also, another polyvinyl chloride film contain a PH indicating dye namely methyl red undergo bleaching in the range of (20- 120 kGy) indicating their suitability for eventual application in sterilization. The third film was a PH indicating dye Cresol red dyed polyvinyl chloride in the presence of cr containing substance (e.g.Chloral- hydrate) . This film have the advantage of clear visual change in color at high dose gamma radiation . This film was developed using the phenomenon of HCI generation from the cr containing substance upon irradiation. The produced HCI in turn changes the color of the indicator contained in the polymer. The Dosimetric parameters e.g. dose response, effect of relative humidity and temperature during irradiation on response as well as pre- and post- irradiation stability of all above films are discussed.