Optimization of laboratory illumination in optical dating

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    Abstract

    As part of the development of new laboratory lighting, we present a methodological approach applicable to the characterization of any light source intended for illumination in optical dating laboratories. We derive optical absorption cross-sections for quartz and feldspar from published data and compare these with the human eye response. The optimum peak wavelength giving the best clarity for non-dark adapted vision for the least trapped charge loss lies within the wavelength range 590e630 nm; we argue that it is unnecessary to consider dark-adapted vision. The predicted relative decay rates of quartz optically stimulated luminescence (OSL) and feldspar infrared stimulated luminescence (IRSL) signals by an incandescent light bulb and a compact fluorescent lamp (CFL) through an ILFORD 902 filter are first derived. These predicted decay rates are then compared with those of three relevant light-emitting diodes (LEDs); this comparison demonstrates the significant advantage of the LED sources over the filtered light sources, because essentially all of the reduction of both OSL and IRSL signals by the LEDs occurs at wavelengths to which the human eye is most sensitive. We conclude that exposure of quartz and feldspar extracts from various samples to the light from an LED with emission peak at 594 nm results in a 1% OSL or IRSL signal loss for a 48-h exposure at a power density of ~0.2 mW.cm-2.
    Original languageEnglish
    JournalQuaternary Geochronology
    Volume39
    Pages (from-to)105-111
    ISSN1871-1014
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Optical dating
    • Laboratory illumination
    • Optimization
    • LED

    Cite this

    @article{19fc2bc43d2246a8b75f1f10002b8582,
    title = "Optimization of laboratory illumination in optical dating",
    abstract = "As part of the development of new laboratory lighting, we present a methodological approach applicable to the characterization of any light source intended for illumination in optical dating laboratories. We derive optical absorption cross-sections for quartz and feldspar from published data and compare these with the human eye response. The optimum peak wavelength giving the best clarity for non-dark adapted vision for the least trapped charge loss lies within the wavelength range 590e630 nm; we argue that it is unnecessary to consider dark-adapted vision. The predicted relative decay rates of quartz optically stimulated luminescence (OSL) and feldspar infrared stimulated luminescence (IRSL) signals by an incandescent light bulb and a compact fluorescent lamp (CFL) through an ILFORD 902 filter are first derived. These predicted decay rates are then compared with those of three relevant light-emitting diodes (LEDs); this comparison demonstrates the significant advantage of the LED sources over the filtered light sources, because essentially all of the reduction of both OSL and IRSL signals by the LEDs occurs at wavelengths to which the human eye is most sensitive. We conclude that exposure of quartz and feldspar extracts from various samples to the light from an LED with emission peak at 594 nm results in a 1{\%} OSL or IRSL signal loss for a 48-h exposure at a power density of ~0.2 mW.cm-2.",
    keywords = "Optical dating, Laboratory illumination, Optimization, LED",
    author = "Reza Sohbati and Andrew Murray and Lindvold, {Lars Ren{\'e}} and Jan-Pieter Buylaert and Mayank Jain",
    year = "2017",
    doi = "10.1016/j.quageo.2017.02.010",
    language = "English",
    volume = "39",
    pages = "105--111",
    journal = "Quaternary Geochronology",
    issn = "1871-1014",
    publisher = "Elsevier",

    }

    Optimization of laboratory illumination in optical dating. / Sohbati, Reza; Murray, Andrew ; Lindvold, Lars René; Buylaert, Jan-Pieter; Jain, Mayank.

    In: Quaternary Geochronology, Vol. 39, 2017, p. 105-111.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - Optimization of laboratory illumination in optical dating

    AU - Sohbati, Reza

    AU - Murray, Andrew

    AU - Lindvold, Lars René

    AU - Buylaert, Jan-Pieter

    AU - Jain, Mayank

    PY - 2017

    Y1 - 2017

    N2 - As part of the development of new laboratory lighting, we present a methodological approach applicable to the characterization of any light source intended for illumination in optical dating laboratories. We derive optical absorption cross-sections for quartz and feldspar from published data and compare these with the human eye response. The optimum peak wavelength giving the best clarity for non-dark adapted vision for the least trapped charge loss lies within the wavelength range 590e630 nm; we argue that it is unnecessary to consider dark-adapted vision. The predicted relative decay rates of quartz optically stimulated luminescence (OSL) and feldspar infrared stimulated luminescence (IRSL) signals by an incandescent light bulb and a compact fluorescent lamp (CFL) through an ILFORD 902 filter are first derived. These predicted decay rates are then compared with those of three relevant light-emitting diodes (LEDs); this comparison demonstrates the significant advantage of the LED sources over the filtered light sources, because essentially all of the reduction of both OSL and IRSL signals by the LEDs occurs at wavelengths to which the human eye is most sensitive. We conclude that exposure of quartz and feldspar extracts from various samples to the light from an LED with emission peak at 594 nm results in a 1% OSL or IRSL signal loss for a 48-h exposure at a power density of ~0.2 mW.cm-2.

    AB - As part of the development of new laboratory lighting, we present a methodological approach applicable to the characterization of any light source intended for illumination in optical dating laboratories. We derive optical absorption cross-sections for quartz and feldspar from published data and compare these with the human eye response. The optimum peak wavelength giving the best clarity for non-dark adapted vision for the least trapped charge loss lies within the wavelength range 590e630 nm; we argue that it is unnecessary to consider dark-adapted vision. The predicted relative decay rates of quartz optically stimulated luminescence (OSL) and feldspar infrared stimulated luminescence (IRSL) signals by an incandescent light bulb and a compact fluorescent lamp (CFL) through an ILFORD 902 filter are first derived. These predicted decay rates are then compared with those of three relevant light-emitting diodes (LEDs); this comparison demonstrates the significant advantage of the LED sources over the filtered light sources, because essentially all of the reduction of both OSL and IRSL signals by the LEDs occurs at wavelengths to which the human eye is most sensitive. We conclude that exposure of quartz and feldspar extracts from various samples to the light from an LED with emission peak at 594 nm results in a 1% OSL or IRSL signal loss for a 48-h exposure at a power density of ~0.2 mW.cm-2.

    KW - Optical dating

    KW - Laboratory illumination

    KW - Optimization

    KW - LED

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    DO - 10.1016/j.quageo.2017.02.010

    M3 - Journal article

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    SP - 105

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    JO - Quaternary Geochronology

    JF - Quaternary Geochronology

    SN - 1871-1014

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