Radiation-shielding properties of metakaolin doped concrete samples were investigated in this report.The gamma photon mass attenuation coefficients and exposure buildup factor of the samples were determined theoretica...Radiation-shielding properties of metakaolin doped concrete samples were investigated in this report.The gamma photon mass attenuation coefficients and exposure buildup factor of the samples were determined theoretically using WinXcom and EXABCal software respectively for the energy range of 15 keV-15 MeV and fast neutron removal cross section for the concrete sample was evaluated.Results indicated that,oxides of silicon,aluminum,calcium and iron determined through the energy dispersive X-ray fluorescence spectrometric analysis constitute more than 85%of the chemical composition of the concrete samples.The oxides contribute 85.46,86.47,87.55,88.75,and 86.15%of the total chemical oxides in MK00,MK05,MK10,MK15,and MK20 respectively.Densities of the prepared MK doped concrete were in the range of 2.575-2.667 g/cm3.Compressive stress of prepared MK doped concretes increased consistently with the curing period for each concrete sample.CS grew from 8.71-10.63,8.84-10.83,9.44-11.22,10.89-11.53,and 10.76-11.43 MPa for MK00,MK05,MK10,MK15,and MK20 respectively as the period extends from 7 to 28 days.Mass attenuation coefficient decrease steadily with an increase in energy up to about 0.1 MeV and the decrease become smaller beyond this energy with increasing energy for all the mixtures.Fast neutron removal cross section results indicate that MK10(0.07693 cm-1)has the highest value ofΣR followed by MK15(0.07628 cm-1)and MK20(0.07537 cm-1)while MK00(0.07380 cm-1)and MK05(0.07404 cm-1)have approximately the same value.It was found that MK10 concrete has the best gamma radiation and fast neutron shielding ability among the MK doped concrete under study.展开更多
This study reports the dosimetric response of a(ZnO)_(0.2)(TeO_(2))_(0.8)thin film sensor irradiated with high-energy X-ray radiation at various doses.The spray pyrolysis method was used for the film deposition on sod...This study reports the dosimetric response of a(ZnO)_(0.2)(TeO_(2))_(0.8)thin film sensor irradiated with high-energy X-ray radiation at various doses.The spray pyrolysis method was used for the film deposition on soda-lime glass substrate using zinc acetate dehydrate and tellurium dioxide powder as the starting precursors.The structural and morphological properties of the film were determined.The I-V characteristics measurements were performed during irradiation with a 6 MV X-ray beam from a Linac.The results revealed that the XRD pattern of the AS-deposited thin film is non-crystalline(amorphous)in nature.The FESEM image shows the non-uniform shape of nanoparticles agglomerated separately,and the EDX spectrum shows the presence of Te,Zn,and O in the film.The I-V characteristics measurements indicate that the current density increases linearly with X-ray doses(0-250 cGy)for all applied voltages(1-6 V).The sensitivity of the thin film sensor has been found to be in the range of 0.37-0.94 mA/cm^(2)/Gy.The current-voltage measurement test for fading normalised in percentage to day 0 was found in the order of day 0>day 15>day 30>day 1>day 2.These results are expected to be beneficial for fabricating cheap and practical X-ray sensors.展开更多
文摘Radiation-shielding properties of metakaolin doped concrete samples were investigated in this report.The gamma photon mass attenuation coefficients and exposure buildup factor of the samples were determined theoretically using WinXcom and EXABCal software respectively for the energy range of 15 keV-15 MeV and fast neutron removal cross section for the concrete sample was evaluated.Results indicated that,oxides of silicon,aluminum,calcium and iron determined through the energy dispersive X-ray fluorescence spectrometric analysis constitute more than 85%of the chemical composition of the concrete samples.The oxides contribute 85.46,86.47,87.55,88.75,and 86.15%of the total chemical oxides in MK00,MK05,MK10,MK15,and MK20 respectively.Densities of the prepared MK doped concrete were in the range of 2.575-2.667 g/cm3.Compressive stress of prepared MK doped concretes increased consistently with the curing period for each concrete sample.CS grew from 8.71-10.63,8.84-10.83,9.44-11.22,10.89-11.53,and 10.76-11.43 MPa for MK00,MK05,MK10,MK15,and MK20 respectively as the period extends from 7 to 28 days.Mass attenuation coefficient decrease steadily with an increase in energy up to about 0.1 MeV and the decrease become smaller beyond this energy with increasing energy for all the mixtures.Fast neutron removal cross section results indicate that MK10(0.07693 cm-1)has the highest value ofΣR followed by MK15(0.07628 cm-1)and MK20(0.07537 cm-1)while MK00(0.07380 cm-1)and MK05(0.07404 cm-1)have approximately the same value.It was found that MK10 concrete has the best gamma radiation and fast neutron shielding ability among the MK doped concrete under study.
文摘This study reports the dosimetric response of a(ZnO)_(0.2)(TeO_(2))_(0.8)thin film sensor irradiated with high-energy X-ray radiation at various doses.The spray pyrolysis method was used for the film deposition on soda-lime glass substrate using zinc acetate dehydrate and tellurium dioxide powder as the starting precursors.The structural and morphological properties of the film were determined.The I-V characteristics measurements were performed during irradiation with a 6 MV X-ray beam from a Linac.The results revealed that the XRD pattern of the AS-deposited thin film is non-crystalline(amorphous)in nature.The FESEM image shows the non-uniform shape of nanoparticles agglomerated separately,and the EDX spectrum shows the presence of Te,Zn,and O in the film.The I-V characteristics measurements indicate that the current density increases linearly with X-ray doses(0-250 cGy)for all applied voltages(1-6 V).The sensitivity of the thin film sensor has been found to be in the range of 0.37-0.94 mA/cm^(2)/Gy.The current-voltage measurement test for fading normalised in percentage to day 0 was found in the order of day 0>day 15>day 30>day 1>day 2.These results are expected to be beneficial for fabricating cheap and practical X-ray sensors.
