Charge recombination processes in minerals studied using optically stimulated luminescence and time-resolved exo-electrons

被引:17
作者
Tsukamoto, Sumiko [1 ,2 ,3 ]
Murray, Andrew [2 ]
Ankjaergaard, Christina [3 ]
Jain, Mayank [3 ]
Lapp, Torben [3 ]
机构
[1] Leibniz Inst Appl Geophys Geochronol & Isotope Hy, D-30655 Hannover, Germany
[2] Aarhus Univ, Riso DTU, Dept Earth Sci, Nord Lab Luminescence Dating, DK-4000 Roskilde, Denmark
[3] Tech Univ Denmark, Riso Natl Lab Sustainable Energy, Div Radiat Res, DK-4000 Roskilde, Denmark
关键词
EXOELECTRON EMISSION; QUARTZ; FELDSPARS; OSL;
D O I
10.1088/0022-3727/43/32/325502
中图分类号
O59 [应用物理学];
学科分类号
摘要
A time-resolved optically stimulated exo-electron (TR-OSE) measurement system has been developed using a Photon Timer attached to a gas-flow semi-proportional pancake electron detector within a Riso TL/OSL reader. The decay rate of the exo-electron emission after the stimulation pulse depends on the probability of (1) escape of electrons into the detector gas from the conduction band by overcoming the work function of the material and (2) thermalization of electrons in the conduction band, and subsequent re-trapping/recombination. Thus, we expect the exo-electron signal to reflect the instantaneous electron concentration in the conduction band. In this study, TR-OSE and time-resolved optically stimulated luminescence (TR-OSL) were measured for the first time using quartz, K-feldspar and NaCl by stimulating the samples using pulsed blue LEDs at different temperatures between 50 and 250 degrees C after beta irradiation and preheating to 280 degrees C. The majority of TR-OSE signals from all the samples decayed much faster than TR-OSL signals irrespective of the stimulation temperatures. This suggests that the lifetime of OSL in these dosimeters arises mainly from the relaxation of an excited state of the recombination centre, rather than from residence time of an electron in the conduction band.
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页数:9
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