تفاصيل الوثيقة نوع الوثيقة : مقال في مجلة دورية  عنوان الوثيقة : Nanoparticles of BaSO4:Eu for heavy-dose measurements Nanoparticles of BaSO4:Eu for heavy-dose measurements   الموضوع : تقنية النانو  لغة الوثيقة : الانجليزية  المستخلص : 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.  ردمد : 0022-2313  اسم الدورية : Journal of Luminescence  المجلد : 129  العدد : 3  سنة النشر : 2009 هـ 2009 م  عدد الصفحات : 5  نوع المقالة : مقالة علمية  تاريخ الاضافة على الموقع : Wednesday, October 14, 2009  الباحثون اسم الباحث (عربي) اسم الباحث (انجليزي) نوع الباحث المرتبة العلمية البريد الالكتروني نعمان عبدالله صلاح Numan Salah باحث دكتوراه alnumany@yahoo.com سامي بن سعيد حبيب Sami S. Habib باحث دكتوراه cnt@kau.edu.sa ظهير خان Khan, Z.H باحث دكتوراه drkhanchem@yahoo.com سالم محمود عبدالله محمد الحامدي Salim Al-Hamedi باحث دكتوراه salem1133@yahoo.com Lochab, S.P Lochab, S.P باحث دكتوراه   الملفات اسم الملف النوع الوصف  23431.pdf pdf Abstract الرجوع إلى صفحة الأبحاث