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Synthesis, characterization and TL properties of SrSO_4:Dy,Tb nanocrystalline phosphor

Journal of Rare Earths 2014年第11期32卷 1003-1009页

作者： khadijeh rezaee ebrahim saraee Amin Aghay Kharieky Maryam Erfani Department of Nuclear Engineering Faculty of Advance Sciences and Technologies University of Isfahan Department of Physics Faculty of Science University Putra Malaysia

SrSO4：Dy,Tb nanocrystalline with crystalline size in the range of 44-54 nm was prepared by co-precipitation method followed by thermal treatment and characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDX） and UV-visible spectrometry. Our results provided direct evidence of incorporation of impurities into nanocrystalline SrSO4. The thermoluminescence （TL） properties of SrSOn：Dy,Tb nanocrystalline pellets irradiated with gamma rays at different doses were studied. The TL glow curve of SrSOa：Dy,Tb nanocrystalline pellets had a prominent peak at around 490 K and a small peak at around 430 K. The major peak in the TL glow curve was almost resolved from other peaks, which was analyzed using Chen＇s peak shape method to determine the TL kinetic parameters such as activation energy, E and kinetic order, b. The intensity of main dosimetric peak of SrSO4：Dy,Tb nanocrystalline pellets at around 490 K increased linearly with the increase in gamma dose. The TL response was linear in the range of 0.1-7 kGy. These properties made it a candidate as a dosimeter to be used for estimating the high dose of gamma rays.

关键词： high dose nanocrystalline SrSO4:Dy,Tb thermoluminescence rare earths

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INAA to Determine Trace Element Concentrations in the Hair of Street Children of Isfahan City, Iran

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World Journal of Nuclear Science and Technology 2013年第4期3卷 117-122页

作者： khadijeh rezaee ebrahim saraee Mohammad Reza Abdi Mohammad Mehdi Gharipour Nayereh Soltani Department of Nuclear Engineering Faculty of Advance Sciences and Technologies University of Isfahan Isfahan Iran Department of Physics Faculty of Science University of Isfahan Isfahan Iran Departments of Physics Universiti Putra Malaysia UPM Serdang Selangor Malaysia Safahan Institute of Higher Education Isfahan Iran

This study aimed to assess trace element concentrations in the hair of street children. Nutritional status was assessed by 24 hours’ dietary recall and anthropometric measurements. Data analysis found that Br, Sc, Sm and Ti concentrations show a normal distribution, and there is no significant difference between street children and control group. However, in the street children’s hair, the levels of Au, U, V are decreased and the levels of Co, La, Sb, Th are increased compared to the control group.

关键词： Hair INAA Isfahan Street Children Trace Elements

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Rare earth elements distribution in marine sediments of Malaysia coasts

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Journal of Rare Earths 2009年第6期27卷 1066-1071页

作者： rezaee ebrahim saraee khadijeh Saion B.Elias Abdul Khalik Wood Abdi Mohammad Reza Universiti Putra Malaysia Physics Department Instrumental Technology Division Malaysian Institute for Nuclear Technology Research(MINT) Department of physics Faculty of ScienceUniversity of Isfahan

In the east coast Peninsular Malaysia region,sediments are transported by several rivers from the east Malaysia into the South China Sea *** the vicinity of the five river estuaries core sediments were collected in order to investigate rare earth elements(REEs) *** sediments were divided into strata of between 2 to 4 cm intervals and prepared for analyzing by *** concentrations of 54.3 μg/gr at 24–26 cm in EC4 increased to 114.1 μg/gr at 20–22 cm in *** measured concentration of ...

关键词： enrichment factor rare earth elements marine sediments South China Sea shale average

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Influence of monovalent cations and CuO nanoparticles on X-nanozeolite in uranium anionic species separation from contaminated drinking water

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Chinese Journal of Chemical Engineering 2017年第6期25卷 782-792页

作者： H.R. Shakur Kh. rezaee ebrahim saraee M.R. Abdi G. Azimi Department of Nuclear Engineering Faculty of Advance Sciences and Technologies University of lsfahan Isfahan 81746-73441 lran Department of Physics Faculty of science University of lsfahan lsfahan 81747-73441 Iran Department of Chemistry University of lsfahan lsfahan 81747-73441 Iran

The main purpose of this work was the modification of NaX nanozeolite using copper oxide nanoparticles and various monovalent cations such as K^+, Cs^+, and Ag^+in order to make the negatively charged zeolite surface accessible for anionic forms of uranium which are the most dominant species of uranium in the contaminated radioactive waters at natural p H. Various methods such as the X-ray fluorescence(XRF), X-ray powder diffraction(XRD), field emission scanning electron microscopy(FE-SEM), transmission electron microscopy(TEM), Fourier transform infrared spectroscopy(FT-IR), and atomic absorption spectroscopy(AAS) were used to characterize the final synthesized absorbents. Batch technique was used to study the adsorption behavior of uranium ions from polluted drinking water by Na X nanozeolite and its modified forms. In order to better understand the performance of them, the results were compared with those that were obtained for synthesizing bulk NaX zeolite and Na-form of clinoptilolite natural zeolite. Preliminary results indicated that uranium sorption increased as the loading level of CuO nanoparticles on NaX nanozeolite increased from 2.1 wt% to 11.2 wt%. In addition,from the obtained data, an increase in uranium removal efficiency resulted as charge/ionic radius ratio of exchanged cation decreased. Also, the effect of contact time, solid–liquid ratio, initial concentration and temperature on the adsorption process was studied. It is worth mentioning that, in this study, the sorption of uranium was performed under natural conditions of pH and the presence of competing cations and anions which are available in drinking waters.

关键词： Zeolite Monovalent cation NaX/CuO nanocomposite Uranium anions Separation Waste water

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