کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1680208 | 1518670 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermoluminescence sensitivity of ulexite after UV irradiation
ترجمه فارسی عنوان
حساسیت ترمولومینسانس اولکسیت پس از تابش اشعه ماوراء بنفش
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کلمات کلیدی
ترمولومینسانس، اشعه ماوراء بنفش، انرژی فعال سازی، افزایش اولیه،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
چکیده انگلیسی
The effects of UV radiation on the thermoluminescence (TL) properties of natural materials, in contrast to synthetic materials, have been scarcely studied. We report on the UV-induced thermoluminescence emission of a Turkish ulexite (NaCaB5O6(OH)6·5H2O) that displays very complex TL glow curves, with at least three groups of components peaked at 130-140 °C, 240 °C and, 340 °C, wherein the last group is weaker. Such emission could be associated with structural changes in the lattice as well as alkali self-diffusion processes. The UV exposure performed at controlled temperatures (at room temperature (RT), 50 °C and 100 °C) produced a (i) different evolutions of the intensities of each maximum, which are directly related to the controlled thermal treatment; (ii) different intensity ratios among the groups of components; (iii) different activation energies (Ea) (1.13 eV for RT, 0.99 eV for 50 °C and 0.49 eV for 100 °C) calculated using the initial rise method; and (iv) similar scattering values (12.4%, 8.2% and 12.8%), which were not a function of the controlled temperature. The thermal stability tests conducted on this borate at different temperatures, based on the Tstop protocol, confirm the presence of a continuum in the distribution of the trap system with progressively increasing Ea (from 0.60 to 0.90 eV).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 349, 15 April 2015, Pages 17-23
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 349, 15 April 2015, Pages 17-23
نویسندگان
M. Topaksu, V. Correcher, J. Garcia-Guinea,