Solid State Science and Technology, Vol. 12, No. 1 (2004) 192-198
THE EFFECTS OF RADIATION ON OPTICAL PROPERTIES OF DYED POLY (VINYL ALCOHOL) BLENDS
E.B. Saion*, Susilawati * 1, A. Doyan* 1, W.M.Daud *, M.Zaki.A. Rahman**,
K.Z.M. Dahlan# and T. Kadni#.
* Department of Physics, Universiti Putra Malaysia, Serdang, Malaysia.
Tel: 03-89466654; Fax: 03-89454454.
** Department of Chemistry, Universiti Putra Malaysia, Serdang, Malaysia.
# Malaysian Institute for Nuclear Technology Research (MINT), Bangi, Malaysia
1 Department of Physics, Universitas Mataram, Lombok, NTB, Indonesia.
The effects of gamma irradiation on the optical properties of dyed poly vinyl alcohol (PVA) films containing trichloroaceticacid (TCA) and acid-sensitive cresol-red dye have been studied. These polymers were exposed to different gamma doses in the range from 1 to 12 kGy. These polymer undergo color change from purple (color of base form) to yellow (color of acid form) upon exposure to gamma irradiation. The radiation-induced change in color was analyzed using UV-Vis spectrometer in the range 350 – 650 nm. The absorbances of polymer in the visible range have been studied in order to develop a dosimeter for gamma ray dosimetry. The absorption spectra produced two absorption bands, peaking at 575 nm for low doses and 438 nm for high doses. The dose-response was plotted by the change in absorbance as a function of absorbed dose. Results of the dose-response curves show the absorption decreases and increases exponentially at bands 575 nm and 438 nm respectively.
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