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

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Charge recombination processes in minerals studied using optically stimulated luminescence and time-resolved exo-electrons. / Tsukamoto, Sumiko; Murray, Andrew; Ankjærgaard, Christina; Jain, Mayank; Lapp, Torben.

In: Journal of Physics D: Applied Physics, Vol. 43, No. 32, 2010, p. 325502.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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Author

Tsukamoto, Sumiko; Murray, Andrew; Ankjærgaard, Christina; Jain, Mayank; Lapp, Torben / Charge recombination processes in minerals studied using optically stimulated luminescence and time-resolved exo-electrons.

In: Journal of Physics D: Applied Physics, Vol. 43, No. 32, 2010, p. 325502.

Publication: Research - peer-reviewJournal article – Annual report year: 2010

Bibtex

@article{aa58aca187ff42d7a172cd92515ecd70,
title = "Charge recombination processes in minerals studied using optically stimulated luminescence and time-resolved exo-electrons",
keywords = "Radiation research and nuclear technologies, Radiation physics, Strålingsfysik, Strålingsforskning og nukleare teknologier",
publisher = "Institute of Physics Publishing",
author = "Sumiko Tsukamoto and Andrew Murray and Christina Ankjærgaard and Mayank Jain and Torben Lapp",
year = "2010",
doi = "10.1088/0022-3727/43/32/325502",
volume = "43",
number = "32",
pages = "325502",
journal = "Journal of Physics D: Applied Physics",
issn = "0022-3727",

}

RIS

TY - JOUR

T1 - Charge recombination processes in minerals studied using optically stimulated luminescence and time-resolved exo-electrons

A1 - Tsukamoto,Sumiko

A1 - Murray,Andrew

A1 - Ankjærgaard,Christina

A1 - Jain,Mayank

A1 - Lapp,Torben

AU - Tsukamoto,Sumiko

AU - Murray,Andrew

AU - Ankjærgaard,Christina

AU - Jain,Mayank

AU - Lapp,Torben

PB - Institute of Physics Publishing

PY - 2010

Y1 - 2010

N2 - 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 Risø 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 °C after beta irradiation and preheating to 280 °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.

AB - 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 Risø 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 °C after beta irradiation and preheating to 280 °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.

KW - Radiation research and nuclear technologies

KW - Radiation physics

KW - Strålingsfysik

KW - Strålingsforskning og nukleare teknologier

U2 - 10.1088/0022-3727/43/32/325502

DO - 10.1088/0022-3727/43/32/325502

JO - Journal of Physics D: Applied Physics

JF - Journal of Physics D: Applied Physics

SN - 0022-3727

IS - 32

VL - 43

SP - 325502

ER -