Radiofluorescence of quartz: A review |
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| Institution: | 1. Chair of Geomorphology, University of Bayreuth, 95440 Bayreuth, Germany;2. IRAMAT-CRP2A, Université Bordeaux Montaigne, 36607 Pessac Cedex, France;3. Department of Physics, East Carolina University, Greenville, NC 27858, USA;4. Department of Geography, Justus-Liebig-University Giessen, 35390 Giessen, Germany;1. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Roskilde, DK, 4000, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, DK, 4000, Denmark;3. Institute of Applied Geology, University of Natural Resources and Life Sciences, Peter Jordan-Str. 82, Vienna A, 1190, Austria;1. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;1. CAS Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehua Street, Guangzhou 510640, China;2. Guangdong Provincial Key Laboratory of Mineral Physics and Materials, 511 Kehua Street, Guangzhou 510640, China;3. University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China;4. Geosciences Department, University of Wisconsin – Parkside, Kenosha, WI 53141, USA;1. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;1. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Science, P.O. Box 9825, Beijing 100029, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, China;3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
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| Abstract: | Radiofluorescence (RF) is the luminescence emitted during exposure to ionizing radiation. Charged particles or high-energy photons can be used as stimulation sources, and different designs for measurement equipment have been published. Only few studies have successfully used the quartz RF signal for dosimetry and dating. However, RF is a valuable tool in deciphering charge trafficking in quartz crystals, and also provides information for identifying types of defects causing specific luminescence emissions. Based on models for charge transfer in quartz, RF is seen as resulting from direct recombination of electrons with holes captured in recombination centers (or vice versa) during ionizing irradiation. Competition between reservoir and luminescent centers explains the initial decay of the modeled RF curve followed by a steady rise and also the observed ‘pre-dose’ effect. Emission spectra have been found to be similar to thermoluminescence (TL) spectra, with prevalent emissions in the UV and further emissions for some samples in the blue-green and red range. The high intensity levels and the possibility of choosing longer accumulation times compared to TL and OSL are advantages of RF for spectral measurements. Relative peak intensities in the emission spectra change with dose and absolute intensities with dose rate. Investigating the RF signal with changing measurement temperature allows calculating physical parameters of individual emissions that control thermal quenching. The degree of thermal quenching varies between the emissions, with most intense quenching in the UV. Sensitization of RF by several orders of magnitude has been observed after annealing at 500 °C. |
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| Keywords: | Luminescence Radioluminescence Radiofluorescence OSL TL Pre-dose effect Modeling Quartz |
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