کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5402988 | 1392748 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nanoparticles of BaSO4:Eu for heavy-dose measurements
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Nanoparticles of BaSO4:Eu for heavy-dose measurements Nanoparticles of BaSO4:Eu for heavy-dose measurements](/preview/png/5402988.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 129, Issue 3, March 2009, Pages 192-196
Journal: Journal of Luminescence - Volume 129, Issue 3, March 2009, Pages 192-196
نویسندگان
Numan Salah, Sami S. Habib, Zishan H. Khan, Salim Al-Hamedi, S.P. Lochab,