Arfa Mubashir | Govt.College University Faisalabad Pakistan (original) (raw)
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CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)
Centre National de la Recherche Scientifique / French National Centre for Scientific Research
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ABSTRACT Nuclear Medicine is being widely used, now a days, for different diagnostic purposes. Th... more ABSTRACT Nuclear Medicine is being widely used, now a days, for different diagnostic purposes. The present study was planned to find out the radiation exposure to nuclear medicine technologists from radioactive patients who have gone through different diagnostic techniques. This study was carried out at Punjab Institute of Nuclear Medicine (PINUM), Faisalabad (Pakistan). In order to carry out this activity, data was collected from the nuclear medicine diagnostic techniques i.e., heart scans (Rest and Stress MIBI), bone scans, renal scans, liver scans, thyroid scans and Thallium heart scans. The radiation exposure was recorded using pen dosimeter (Arrow-Tech W138) having range 0-200mR. Heart scan (Stress MIBI) was taken as standard as it showed maximum exposure (0.584 mR) and equivalent dose corresponding to this exposure (5.85μSv) amongst all scans.
Red Cabbage (Brassica oleracea) contains a pigment called anthocyanine which changes color over d... more Red Cabbage (Brassica oleracea) contains a pigment called anthocyanine which changes color over different pH ranges. We examined spectrophotometrically the effects of gamma irradiation on aqueous solutions of red cabbage dye to facilitate industrial applications. Samples were exposed to Cs-137 γ source from 0-100 kGy. Irradiation greater than 60 kGy clearly affected the major colorant in extracts of red cabbage leaves. Dosimetric characterization on basis of dye concentration and pH values was also described which showed that these dye solutions can satisfactorily be used as dye dosimeters in gamma dose range of 60-100 kGy.
Polyvinyl-alcohol based reactive red 195-A films (PVA-R) were irradiated by Cs 137 γ-source in th... more Polyvinyl-alcohol based reactive red 195-A films (PVA-R) were irradiated by Cs 137 γ-source in the range of 200 Gy-10 5 Gy. The effects of gamma irradiation on optical and mechanical properties of PVA-R were studied using spectrophotometry and x-ray diffraction (XRD) technique to check its feasibility in radiation processing. The found values of the λmax and the molar extinction coefficient of the dye were 520 nm and 48 Lgm -1 mm -1 respectively. Parameters such as effect of dye concentration and pH values, Electrical Conductivity, % decoloration, Strain , % crystallinity, crystallinity Index (C.I.) and crystallite size (d) have been selected for the dosimetric and mechanical strength evaluation. Linearity between specific absorbance and absorbed dose showed that acidic samples of PVA-R films can be better chemical dosimeter as compared to alkaline ones in dose range of 200 Gy-10 kGy. At high dose i.e., 100 kGy of gamma irradiation, change in mechanical strength was found due to decrease in crystallinity, crystallite size and increase in strain values.
were irradiated by Cs 137 γ-source in the range of 200 Gy-10 5 Gy. The effects of gamma irradiati... more were irradiated by Cs 137 γ-source in the range of 200 Gy-10 5 Gy. The effects of gamma irradiation on optical and mechanical properties of PVA-Y were studied using spectrophotometry and x-ray diffraction (XRD) technique to check its feasibility in radiation processing. The found values of the λ max and the molar extinction coefficient of the dye were 418 nm and 78 Lgm -1 mm -1 respectively. Parameters such as effect of dye concentration and pH values, Electrical Conductivity, % decoloration, Strain , % crystallinity, crystallinity Index (C.I.) and crystallite size (d) have been selected for the dosimetric and mechanical strength evaluation. Linearity between specific absorbance and absorbed dose showed that PVA-Y films can be best chemical dosimeter in two different ranges i.e., 200 Gy-1 kGy and 10 kGy-100 kGy. At high dose 80-100 kGy of gamma irradiation, change in mechanical strength was found due to decrease in crystallinity, crystallite size and increase in strain values.
In the present study chemical dosimeters having aqueous solutions of Coriander leaves dye were ir... more In the present study chemical dosimeters having aqueous solutions of Coriander leaves dye were irradiated by Cs-137 gamma source in the range (0-100)KGy. The standard aqueous solutions were scanned by UV/VIS spectrophotometer for the determination of maximum wave length (λ max ) and the absorbance (A). The plot between concentration C and A gave approximate linear relationship and hence verified Beer's Law. Out of all the dye concentrations it was found that c1 =35g L -1 gave ideal dosimetric behavior which proved that these dye solutions are strongly dependent on dye concentration. Useful dose range for this dye to be used as a chemical dosimeter was found to be 60kGy to 100kGY.
ABSTRACT Nuclear Medicine is being widely used, now a days, for different diagnostic purposes. Th... more ABSTRACT Nuclear Medicine is being widely used, now a days, for different diagnostic purposes. The present study was planned to find out the radiation exposure to nuclear medicine technologists from radioactive patients who have gone through different diagnostic techniques. This study was carried out at Punjab Institute of Nuclear Medicine (PINUM), Faisalabad (Pakistan). In order to carry out this activity, data was collected from the nuclear medicine diagnostic techniques i.e., heart scans (Rest and Stress MIBI), bone scans, renal scans, liver scans, thyroid scans and Thallium heart scans. The radiation exposure was recorded using pen dosimeter (Arrow-Tech W138) having range 0-200mR. Heart scan (Stress MIBI) was taken as standard as it showed maximum exposure (0.584 mR) and equivalent dose corresponding to this exposure (5.85μSv) amongst all scans.
Red Cabbage (Brassica oleracea) contains a pigment called anthocyanine which changes color over d... more Red Cabbage (Brassica oleracea) contains a pigment called anthocyanine which changes color over different pH ranges. We examined spectrophotometrically the effects of gamma irradiation on aqueous solutions of red cabbage dye to facilitate industrial applications. Samples were exposed to Cs-137 γ source from 0-100 kGy. Irradiation greater than 60 kGy clearly affected the major colorant in extracts of red cabbage leaves. Dosimetric characterization on basis of dye concentration and pH values was also described which showed that these dye solutions can satisfactorily be used as dye dosimeters in gamma dose range of 60-100 kGy.
Polyvinyl-alcohol based reactive red 195-A films (PVA-R) were irradiated by Cs 137 γ-source in th... more Polyvinyl-alcohol based reactive red 195-A films (PVA-R) were irradiated by Cs 137 γ-source in the range of 200 Gy-10 5 Gy. The effects of gamma irradiation on optical and mechanical properties of PVA-R were studied using spectrophotometry and x-ray diffraction (XRD) technique to check its feasibility in radiation processing. The found values of the λmax and the molar extinction coefficient of the dye were 520 nm and 48 Lgm -1 mm -1 respectively. Parameters such as effect of dye concentration and pH values, Electrical Conductivity, % decoloration, Strain , % crystallinity, crystallinity Index (C.I.) and crystallite size (d) have been selected for the dosimetric and mechanical strength evaluation. Linearity between specific absorbance and absorbed dose showed that acidic samples of PVA-R films can be better chemical dosimeter as compared to alkaline ones in dose range of 200 Gy-10 kGy. At high dose i.e., 100 kGy of gamma irradiation, change in mechanical strength was found due to decrease in crystallinity, crystallite size and increase in strain values.
were irradiated by Cs 137 γ-source in the range of 200 Gy-10 5 Gy. The effects of gamma irradiati... more were irradiated by Cs 137 γ-source in the range of 200 Gy-10 5 Gy. The effects of gamma irradiation on optical and mechanical properties of PVA-Y were studied using spectrophotometry and x-ray diffraction (XRD) technique to check its feasibility in radiation processing. The found values of the λ max and the molar extinction coefficient of the dye were 418 nm and 78 Lgm -1 mm -1 respectively. Parameters such as effect of dye concentration and pH values, Electrical Conductivity, % decoloration, Strain , % crystallinity, crystallinity Index (C.I.) and crystallite size (d) have been selected for the dosimetric and mechanical strength evaluation. Linearity between specific absorbance and absorbed dose showed that PVA-Y films can be best chemical dosimeter in two different ranges i.e., 200 Gy-1 kGy and 10 kGy-100 kGy. At high dose 80-100 kGy of gamma irradiation, change in mechanical strength was found due to decrease in crystallinity, crystallite size and increase in strain values.
In the present study chemical dosimeters having aqueous solutions of Coriander leaves dye were ir... more In the present study chemical dosimeters having aqueous solutions of Coriander leaves dye were irradiated by Cs-137 gamma source in the range (0-100)KGy. The standard aqueous solutions were scanned by UV/VIS spectrophotometer for the determination of maximum wave length (λ max ) and the absorbance (A). The plot between concentration C and A gave approximate linear relationship and hence verified Beer's Law. Out of all the dye concentrations it was found that c1 =35g L -1 gave ideal dosimetric behavior which proved that these dye solutions are strongly dependent on dye concentration. Useful dose range for this dye to be used as a chemical dosimeter was found to be 60kGy to 100kGY.