Pulsed IRSL: A stable and fast bleaching luminescence signal from feldspar for dating Quaternary sediments

Sumiko Tsukamoto, Reisuke Kondo, Tobias Lauer, Mayank Jain

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    Abstract

    Elevated temperature post-infrared infrared stimulated luminescence (post-IR IRSL; pIRIR) dating method using feldspar has led to a significant advancement in dating Quaternary sediments, as this signal has been shown to be stable on geological time scales. In comparison to the conventional IRSL, the pIRIR signal is nearly free from anomalous fading, but it is more difficult to reset during daylight exposure; the latter characteristic may give rise to age over-estimation in some environments because of partial bleaching. The pulsed IRSL signal has also been known to be less affected by anomalous fading, when the signal is recorded during the off-time of LED stimulation pulses. In this study, we compare the signal bleachability, thermal and athermal stability, and age estimates derived using different measurement methods, i.e., pulsed IRSL measured at 50 °C (pulsed IR50; subscripts refers to measurement temperature), continuous wave (CW) pIRIR225 and pIRIR290 signals, as well as the two IR50 signals measured as a part of the pIRIR protocols. This comparison is carried out for 3 samples taken from Late Quaternary fluvial sediments, which have independent age estimates from radiocarbon dating and tephrochronology. We observe that under exposure to solar simulator, the pulsed IR50 signal bleaches as rapidly as the CW IR50, and much more rapidly than the pIRIR signals. Furthermore, the pulsed IR50 signal is also as stable as the pIRIR signals, especially when the middle part of the decay curve is used for signal intensity calculation.
    Original languageEnglish
    JournalQuaternary Geochronology
    Volume41
    Pages (from-to)26-36
    Number of pages11
    ISSN1871-1014
    DOIs
    Publication statusPublished - 2017

    Cite this

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    title = "Pulsed IRSL: A stable and fast bleaching luminescence signal from feldspar for dating Quaternary sediments",
    abstract = "Elevated temperature post-infrared infrared stimulated luminescence (post-IR IRSL; pIRIR) dating method using feldspar has led to a significant advancement in dating Quaternary sediments, as this signal has been shown to be stable on geological time scales. In comparison to the conventional IRSL, the pIRIR signal is nearly free from anomalous fading, but it is more difficult to reset during daylight exposure; the latter characteristic may give rise to age over-estimation in some environments because of partial bleaching. The pulsed IRSL signal has also been known to be less affected by anomalous fading, when the signal is recorded during the off-time of LED stimulation pulses. In this study, we compare the signal bleachability, thermal and athermal stability, and age estimates derived using different measurement methods, i.e., pulsed IRSL measured at 50 °C (pulsed IR50; subscripts refers to measurement temperature), continuous wave (CW) pIRIR225 and pIRIR290 signals, as well as the two IR50 signals measured as a part of the pIRIR protocols. This comparison is carried out for 3 samples taken from Late Quaternary fluvial sediments, which have independent age estimates from radiocarbon dating and tephrochronology. We observe that under exposure to solar simulator, the pulsed IR50 signal bleaches as rapidly as the CW IR50, and much more rapidly than the pIRIR signals. Furthermore, the pulsed IR50 signal is also as stable as the pIRIR signals, especially when the middle part of the decay curve is used for signal intensity calculation.",
    author = "Sumiko Tsukamoto and Reisuke Kondo and Tobias Lauer and Mayank Jain",
    year = "2017",
    doi = "10.1016/j.quageo.2017.05.004",
    language = "English",
    volume = "41",
    pages = "26--36",
    journal = "Quaternary Geochronology",
    issn = "1871-1014",
    publisher = "Elsevier",

    }

    Pulsed IRSL: A stable and fast bleaching luminescence signal from feldspar for dating Quaternary sediments. / Tsukamoto, Sumiko; Kondo, Reisuke; Lauer, Tobias; Jain, Mayank.

    In: Quaternary Geochronology, Vol. 41, 2017, p. 26-36.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - Pulsed IRSL: A stable and fast bleaching luminescence signal from feldspar for dating Quaternary sediments

    AU - Tsukamoto, Sumiko

    AU - Kondo, Reisuke

    AU - Lauer, Tobias

    AU - Jain, Mayank

    PY - 2017

    Y1 - 2017

    N2 - Elevated temperature post-infrared infrared stimulated luminescence (post-IR IRSL; pIRIR) dating method using feldspar has led to a significant advancement in dating Quaternary sediments, as this signal has been shown to be stable on geological time scales. In comparison to the conventional IRSL, the pIRIR signal is nearly free from anomalous fading, but it is more difficult to reset during daylight exposure; the latter characteristic may give rise to age over-estimation in some environments because of partial bleaching. The pulsed IRSL signal has also been known to be less affected by anomalous fading, when the signal is recorded during the off-time of LED stimulation pulses. In this study, we compare the signal bleachability, thermal and athermal stability, and age estimates derived using different measurement methods, i.e., pulsed IRSL measured at 50 °C (pulsed IR50; subscripts refers to measurement temperature), continuous wave (CW) pIRIR225 and pIRIR290 signals, as well as the two IR50 signals measured as a part of the pIRIR protocols. This comparison is carried out for 3 samples taken from Late Quaternary fluvial sediments, which have independent age estimates from radiocarbon dating and tephrochronology. We observe that under exposure to solar simulator, the pulsed IR50 signal bleaches as rapidly as the CW IR50, and much more rapidly than the pIRIR signals. Furthermore, the pulsed IR50 signal is also as stable as the pIRIR signals, especially when the middle part of the decay curve is used for signal intensity calculation.

    AB - Elevated temperature post-infrared infrared stimulated luminescence (post-IR IRSL; pIRIR) dating method using feldspar has led to a significant advancement in dating Quaternary sediments, as this signal has been shown to be stable on geological time scales. In comparison to the conventional IRSL, the pIRIR signal is nearly free from anomalous fading, but it is more difficult to reset during daylight exposure; the latter characteristic may give rise to age over-estimation in some environments because of partial bleaching. The pulsed IRSL signal has also been known to be less affected by anomalous fading, when the signal is recorded during the off-time of LED stimulation pulses. In this study, we compare the signal bleachability, thermal and athermal stability, and age estimates derived using different measurement methods, i.e., pulsed IRSL measured at 50 °C (pulsed IR50; subscripts refers to measurement temperature), continuous wave (CW) pIRIR225 and pIRIR290 signals, as well as the two IR50 signals measured as a part of the pIRIR protocols. This comparison is carried out for 3 samples taken from Late Quaternary fluvial sediments, which have independent age estimates from radiocarbon dating and tephrochronology. We observe that under exposure to solar simulator, the pulsed IR50 signal bleaches as rapidly as the CW IR50, and much more rapidly than the pIRIR signals. Furthermore, the pulsed IR50 signal is also as stable as the pIRIR signals, especially when the middle part of the decay curve is used for signal intensity calculation.

    U2 - 10.1016/j.quageo.2017.05.004

    DO - 10.1016/j.quageo.2017.05.004

    M3 - Journal article

    VL - 41

    SP - 26

    EP - 36

    JO - Quaternary Geochronology

    JF - Quaternary Geochronology

    SN - 1871-1014

    ER -