Document Details Document Type : Article In Journal  Document Title : Nanoparticles of BaSO4:Eu for heavy-dose measurements Nanoparticles of BaSO4:Eu for heavy-dose measurements   Subject : Nanotechnology  Document Language : English  Abstract : Nanoparticles of BaSO4:Eu with grain size in the range 30-50 nm have been prepared by the chemical co-precipitation method and characterized by UV-visible spectrometry and X-ray diffraction (XRD). Shape and size of the prepared nanomaterials were observed by a scanning electron microscope (SEM). The optical energy band gaps of the micro- and nanocrystalline BaSO4:Eu were determined and are found to be 3.39±0.0136 and 3.48±0.0139 eV, respectively. The thermoluminescence (TL) glow curve of BaSO4:Eu nanoparticles has been studied and compared with that of the corresponding microcrystalline powder. It has been observed that the TL glow peak at 497 K, seen prominently in the microcrystalline sample, appeared as a small peak in nanocrystalline powder, while that observed as a shoulder in the former at 462 K dominates in the latter. The observed TL sensitivity of the prepared nanocrystalline powder is less than that of the microcrystalline sample at low doses, while it is more at higher doses. This nanophosphor exhibits a linear/sublinear TL response to γ-radiation over a very wide range of exposures (0.1 Gy to 7 KGy), which is much wider compared to that of the microcrystalline counterpart (0.1-10 Gy). This response over a large span of exposures makes the nanostructure form of BaSO4:Eu useful for its application to estimate low as well as high exposures of γ-rays. © 2008 Elsevier B.V. All rights reserved.  ISSN : 0022-2313  Journal Name : Journal of Luminescence  Volume : 129  Issue Number : 3  Publishing Year : 2009 AH 2009 AD  Number Of Pages : 5  Article Type : Article  Added Date : Wednesday, October 14, 2009  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email نعمان عبدالله صلاح Numan Salah Researcher Doctorate alnumany@yahoo.com سامي بن سعيد حبيب Sami S. Habib Researcher Doctorate cnt@kau.edu.sa ظهير خان Khan, Z.H Researcher Doctorate drkhanchem@yahoo.com سالم محمود عبدالله محمد الحامدي Salim Al-Hamedi Researcher Doctorate salem1133@yahoo.com Lochab, S.P Lochab, S.P Researcher Doctorate   Files File Name Type Description  23431.pdf pdf Abstract Back To Researches Page