Effect of Lambda-radiation on the physical properties of poly(vinyl alcohol) dyed with tetrabromophenolphthalein ethyl ester

Abstract

In the present investigation the radiation sensitive indicators based on dyed poly(vinyl alcohol) (PVA) containing acid sensitive dye tetrabromophenolphthalein ethyl ester (TBPE) and tri-chloro acetamid (TCA) have been developed. These plastic film dosimeters undergo color change from blue to green to pale green, indicating acid formation. These films can be used as dosimeters for food irradiation applications where the maximum of the useful dose ranges are between 1-5 kGy depending on (TCA) concentration in the film. The films have the advantage of negligible humidity effects on response in the intermediate range of relative humidity from 10 to 50  % and good stability before and after irradiation under different storage conditions.

Key words: (tetrabromophenolphthalein ethyl ester), poly(vinyl alcohol), gamma ray dosimeter.