waleed raja | Federal Urdu University of Arts, Science and Technology,Islamabad, Pakistan (original) (raw)
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Papers by waleed raja
Energy Procedia, 2013
In this research, thin films of CdO of thicknesses 500nm;450nm;400nm;350nm;300nm±30 have been pre... more In this research, thin films of CdO of thicknesses 500nm;450nm;400nm;350nm;300nm±30 have been prepared using chemical spray method. The films have been deposited on Crown glass substrates. Optical studies show that in these films the electronic transition is of the direct transition type. The optical energy gap for the films of as deposited are within the range 2-2.08eV and for those heat treated for an hour at different temperatures: (as deposited 300K; 523K; 548K; 573K) is estimated to be in the range 2.08-2.85eV. Results analysis exhibits the dependence of optical energy gap on the temperature of heat treatment and the dependence on films thickness was not significant.
XIAMEN-CUSTIPEN WORKSHOP ON THE EQUATION OF STATE OF DENSE NEUTRON-RICH MATTER IN THE ERA OF GRAVITATIONAL WAVE ASTRONOMY
This study comprises of the measurements and analysis of effective parameters involved in the env... more This study comprises of the measurements and analysis of effective parameters involved in the environmental pollution of Al-Tarmiyah water in the north of Baghdad. Thirteen water samples were taken from various places in the region. The Radon concentration was measured in all these samples using CN-85 track detector with accuracy adequate to be compared with available data presented by WHO and USEPA which gives the allowed annual dosage levels. Typical concentration values of 0.98 Bq/L, 1.47 Bq/L, 1.70 Bq/L and 3.20 Bq/L were recorded corresponding to tap water, river banks water, regional well water and pest water respectively. From these measured values, the average effective annual dosage, allowed for the whole body, stomachs and lungs were then calculated. In comparison, pest water and well water with average effective annual dosage level were found higher than the allowed ones and their water cannot be used for drinking.
Journal of Al-Nahrain University-Science
Gamma ray spectroscopy technique with detector of high purity germanium (HPGe, 30% efficiency, en... more Gamma ray spectroscopy technique with detector of high purity germanium (HPGe, 30% efficiency, energy separation 2.2keV at 1332keV for Co-60 isotope) connected to GINE-2000 program, has been used to measure the specific activity of ten soil samples taken from the new location of Al-Iraqia University 30 km north to Baghdad. Results have shown that the average specific activity of Pb-214, Bi-214 nuclides, as an equivalent to the U-238 specific activity is 15.4320.936 Bq/kg and 14.6541.33 Bq/kg for the (Ac-228, Ti-208) as an equivalent to the Th-232. On the other hand, the average specific activity of K-40 was 772.5300.87 Bq/Kg and (6.9520.79Bq/kg) for CS-137 isotope. An agreement has been found between the present results and the allowable lower limit values considered by the IAEA for specific activity.
Energy Procedia, 2013
In this research, thin films of CdO of thicknesses 500nm;450nm;400nm;350nm;300nm±30 have been pre... more In this research, thin films of CdO of thicknesses 500nm;450nm;400nm;350nm;300nm±30 have been prepared using chemical spray method. The films have been deposited on Crown glass substrates. Optical studies show that in these films the electronic transition is of the direct transition type. The optical energy gap for the films of as deposited are within the range 2-2.08eV and for those heat treated for an hour at different temperatures: (as deposited 300K; 523K; 548K; 573K) is estimated to be in the range 2.08-2.85eV. Results analysis exhibits the dependence of optical energy gap on the temperature of heat treatment and the dependence on films thickness was not significant.
XIAMEN-CUSTIPEN WORKSHOP ON THE EQUATION OF STATE OF DENSE NEUTRON-RICH MATTER IN THE ERA OF GRAVITATIONAL WAVE ASTRONOMY
This study comprises of the measurements and analysis of effective parameters involved in the env... more This study comprises of the measurements and analysis of effective parameters involved in the environmental pollution of Al-Tarmiyah water in the north of Baghdad. Thirteen water samples were taken from various places in the region. The Radon concentration was measured in all these samples using CN-85 track detector with accuracy adequate to be compared with available data presented by WHO and USEPA which gives the allowed annual dosage levels. Typical concentration values of 0.98 Bq/L, 1.47 Bq/L, 1.70 Bq/L and 3.20 Bq/L were recorded corresponding to tap water, river banks water, regional well water and pest water respectively. From these measured values, the average effective annual dosage, allowed for the whole body, stomachs and lungs were then calculated. In comparison, pest water and well water with average effective annual dosage level were found higher than the allowed ones and their water cannot be used for drinking.
Journal of Al-Nahrain University-Science
Gamma ray spectroscopy technique with detector of high purity germanium (HPGe, 30% efficiency, en... more Gamma ray spectroscopy technique with detector of high purity germanium (HPGe, 30% efficiency, energy separation 2.2keV at 1332keV for Co-60 isotope) connected to GINE-2000 program, has been used to measure the specific activity of ten soil samples taken from the new location of Al-Iraqia University 30 km north to Baghdad. Results have shown that the average specific activity of Pb-214, Bi-214 nuclides, as an equivalent to the U-238 specific activity is 15.4320.936 Bq/kg and 14.6541.33 Bq/kg for the (Ac-228, Ti-208) as an equivalent to the Th-232. On the other hand, the average specific activity of K-40 was 772.5300.87 Bq/Kg and (6.9520.79Bq/kg) for CS-137 isotope. An agreement has been found between the present results and the allowable lower limit values considered by the IAEA for specific activity.