TITLE:
Study the Effect of Gamma Radiation on the Optical Energy Gap of Poly(Vinyl Alcohol) Based Ferrotitanium Alloy Film: Its Possible Use in Radiation Dosimetry
AUTHORS:
Sayeda Eid, Seif Ebraheem, Nehad M. Abdel-Kader
KEYWORDS:
Polymer, Ferrotitanium Alloy, Gamma Irradiation, Optical Band Gap
JOURNAL NAME:
Open Journal of Polymer Chemistry,
Vol.4 No.2,
April
22,
2014
ABSTRACT:
Ferrotitanium alloy polymer films, prepared by a simple technique of
casting aqueous solutions of poly(vinyl alcohol) PVA containing ferrotitanium
alloy on a horizontal glass plate, are useful as routine high-dose dosimeters.
These flexible plastic film dosimeters have pale yellow color, are bleached
when exposed to gamma rays. The chemical composition of alloy was determined by
EDX, and structure of alloy was determined by XRD. The response of these
dosimeters depends on the concentration of alloy. The energy band gap Eg was calculated and the effect of gamma radiation on its value was determined.
The optical absorption spectra showed that the absorption mechanism is an
indirect allowed transition which found that energy band gap Eg decreases after irradiation. The response of these films has negligible
humidity effects on the range of relative humidity from 0 to 100%. And also, it
exhibits good preand post-irradiation stability in dark and light.