TL and OSL studies on neutron irradiated pure α-Al2O3 single crystals

被引：12
|
作者：
Kulkarni, M. S. [1 ]
Rawat, N. S. [1 ]
Thakare, S. V. [2 ]
Jagadeesan, K. C. [2 ]
Mishra, D. R. [1 ]
Muthe, K. P. [3 ]
Bhatt, B. C. [1 ]
Gupta, S. K. [3 ]
Sharma, D. N. [1 ]
机构：
[1] Bhabha Atom Res Ctr, Radiat Safety Syst Div, Mumbai 400085, Maharashtra, India
[2] Bhabha Atom Res Ctr, Radiopharmacut Div, Mumbai 400085, Maharashtra, India
[3] Bhabha Atom Res Ctr, Tech Phys Div, Mumbai 400085, Maharashtra, India
来源：
RADIATION MEASUREMENTS | 2011年 / 46卷 / 12期
关键词：
alpha-Al2O3; TL; OSL; F center; F+ center; LUMINESCENCE; THERMOLUMINESCENCE; REACTOR;
D O I：
10.1016/j.radmeas.2011.04.028
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
alpha-Al2O3 single crystals were irradiated to various thermal neutron fluences in the range of 10(14) to 10(18) n/cm(2) with associated fast neutron fluence and gamma rays in the CIRUS reactor. The neutron irradiation of alpha-Al2O3 crystals in the reactor introduces considerable oxygen vacancies in the crystals, which is confirmed by the presence of F (203 nm) and F+ (225 and 255 nm) bands in their optical absorption (OA) spectra. The concentration of the F and F+ centers increases with the increase in neutron fluence and are responsible for the observed TL and OSL in the alpha-Al2O3 single crystals. The F/F+ concentration ratio of alpha-Al2O3 samples irradiated to thermal neutron fluence of 10(18) n/cm(2) (with an associated fast neutron fluence of 7 x 10(15) n/cm(2)) is 0.68. The photoluminescence and OA studies indicate formation of excess F+ center in the neutron irradiated Al2O3 single crystals. The TL glow curve of the reactor neutron irradiated Al2O3 is different from the TL glow curve structure of the TLD-500 single crystal. (C) 2011 Elsevier Ltd. All rights reserved.
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收藏
页码：1704 / 1707
页数：4
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