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Tunneling Processes and Anomalous Fading in Natural Feldspars Extracted from Quaternary Deposits

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Abstract

Reasons for a temporal decrease (fading) in the accumulated energy in feldspars used as paleodosimeters are considered. The tunneling processes capable of leading to fading as well as temperature and time dependences of tunnel afterglow have been studied in detail. It is shown that this glow bears no direct relation to the possible tunnel depletion of the dosimetric trapping centers. With a view toward directly observing tunneling from these centers, the temperature dependences (from −200°C to +100°C) of the intensity of the luminescence stimulated in the IR band with λ ≈ 900 nm (of the optically stimulated luminescence (OSL) signal) have been studied in detail. Within the limits of sensitivity of the equipment used, tunneling from the dosimetric centers has not been detected. It has been inferred that in fading of the OSL signal, an essential role can be played by the traps that are depleted at 200°C and have a lifetime of about 2 years at room temperature.

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Authors and Affiliations

  1. Institute of Experimental Physics and Technology, Tartu University, 4 Tahe Str., Tartu, 51010, Estonia

    V. Vasil’chenko

  2. Institute of Geology, Tallin Technical University, Estonia

    A. Molod’kov & I. Jaek

Authors
  1. V. Vasil’chenko
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  2. A. Molod’kov
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  3. I. Jaek
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Correspondence to V. Vasil’chenko.

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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 2, pp. 207–212, March–April, 2005.

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Vasil’chenko, V., Molod’kov, A. & Jaek, I. Tunneling Processes and Anomalous Fading in Natural Feldspars Extracted from Quaternary Deposits. J Appl Spectrosc 72, 218–223 (2005). https://doi.org/10.1007/s10812-005-0058-9

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  • DOI: https://doi.org/10.1007/s10812-005-0058-9

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