Spectral study on feldspar thermoluminescence process |
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Authors: | GeLian Gong ShunSheng Liu Bin Xia WeiDong Sun and BaoLin Huang |
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Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;(2) Graduate University of the Chinese Academy of Sciences, Beijing, 100864, China |
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Abstract: | Feldspar thermoluminescence fading phenomena were investigated here by using newly-constructed thermoluminescence spectrometer
on the basis of charge-coupled detector, and thereafter the discussion and explanation on feldspar TL fading mechanism were
presented. The experimental results show that the fading rate of feldspar TL depends on both wavelength and stimulated temperature,
and normally the feldspar TL in every region of wavelength and temperature shows different traits, namely the low temperature
TL (170°–190°) fading at the rate of logarithmic function and furthermore the TL of different wavelengths fading at approximately
the same rate on the condition of 160° preheating. While the medium and high temperature TLs (290°–400°) do not show much
thermal fading, their fading rate at room temperature invariably correlates well with their wavelength, namely the longer
TL wavelength, the slower TL fading rate. The thermal instability of traps and the quantum-mechanical tunneling effects can
explain the above fading phenomena respectively. It is recognized that feldspar TL fading depends on its wavelength, and furthermore
new aspects of the solid thermoluminescence process can be displayed by the combination of three-dimensional TL spectral analysis
and thermal fading or anomalous fading of TL for feldspar.
Supported by the National Natural Science Foundation of China (Grant No. 40534019) and the Knowledge Innovation Program of
the Chinese Academy of Sciences (Grant No. GIGCX3-07-10) |
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Keywords: | feldspar thermoluminescence spectral anomalous fading thermoluminescence process |
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