Evaluation of the Sensitivity of Poly Vinyl Alcohol Films Doped with Silver Nitrate to Low X-ray Doses

Abstract

This research pertains to study the sensitivity of Poly Vinyl Alcohol Films Doped with Silver Nitrate to Low X-ray Doses and their uses as chemical Radiation Dosimeter, Studied on irradiated polymers show many advantages of induced radiation changes on which can be quantified and qualitied to deduce the amount of radiation dose and exposure in diagnostic radiology, The PVA/AgNO3 Films were made through solvent casting technique with seven concentrations of AgNO3/PVA percentage and that is (C1, C2, C3, C4, C5, C6, C7), by dissolving each concentration of PVA powder in 100 ml distilled water at room temperature on a beaker and The solutions were magnetically stirred at room temperature for 3 hours and then the PVA/AgNO3 solutions poured in a petri-dish to form films by casting method in dark room. and left to dry at ambient temperature at least 2 days. Then films were peeled off in the petri-dish, cut into small films 2x2cm, loaded in sealed dark dental film envelope, then the PVA/AgNO3 films were irradiated with low x-ray doses in the range of diagnostic levels, [.15, 33, .59, .93, 1.34] mGy and The sensitivity of PVA/AgNO3 films were characterized using optical densitometer and UV-vis spectrophotometer, the result showed that the irradiation of the PVA\AgNo3 films with x-ray doses induces color change and The color intensity was increase with increasing x-ray doses, the optical densitometer analysis showed positive correlation between AgNO3 concentrations and optical density of PVA/AgNO3 and positive correlation between x-ray doses and optical density of PVA/AgNO3 , the UV-vis spectrophotometer analysis of PVA/AgNO3 films showed absorption peak at the wavelengths [430, 435, 434, 445, 442] nm for films prepared with (4) wt% of AgNO3 irradiated with x-ray doses [0.15, 0.33, 0.59, 0.93, 1.34] mGy, and the intensity of peaks is proportional to the x-ray dose, in addition to the specific absorbance and absorption coefficient is directly proportional to the irradiated x-ray doses, the conclusion the synthetic PVA/ AgNO3 films showed good response to low x-ray doses it can be used as chemical radiation dosimeters in diagnostic radiology centers.