Measurement of natural radioactivity: Calibration and performance of a high-resolution gamma spectrometry facility

Murray, Andrew; Helsted, Louise Maria; Autzen, Martin; Jain, Mayank; Buylaert, Jan‐Pieter

doi:10.1016/j.radmeas.2018.04.006

Cited by 81 publications

(56 citation statements)

References 9 publications

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“…The samples were analysed for natural radionuclide concentrations in the laboratory, using highresolution gamma spectrometry [24,25]. These concentrations were converted into dose rates using conversion factors listed by Olley [26]; a cosmic ray contribution was calculated according to [27], assuming the modern burial depth has applied throughout the lifetime of the site.…”

Section: Geochronologymentioning

confidence: 99%

Glacial history and palaeo-environmental change of southern Taimyr Peninsula, Arctic Russia, during the Middle and Late Pleistocene

Möller

Benediktsson

Anjar

et al. 2019

Earth-Science Reviews

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This Data in Brief paper contains data (including images) from Quaternary sedimentary successions investigated along the Bol'shaya Balakhnya River and the LuktakheUpper TaimyraeLogata river system on southern Taimyr Peninsula, NW Siberia (Russia). Marine foraminifera and mollusc fauna composition, extracted from sediment samples, is presented. The chronology (time of deposition) of the sediment successions is reconstructed from three dating methods; (i) radiocarbon dating of organic detritus (from lacustrine/fluvial sediment) and molluscs (marine sediment) as finite ages (usually <42 000 years) or as non-finite ages (>42 000e48 000 years) on samples/sediments beyond the radiocarbon

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Section: Geochronologymentioning

confidence: 99%

Glacial history and palaeo-environmental change of southern Taimyr Peninsula, Arctic Russia, during the Middle and Late Pleistocene

Möller

Benediktsson

Anjar

et al. 2019

Earth-Science Reviews

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“…After drilling, remaining cobble pieces and the material from around each cobble (~200 g per site) were prepared separately for high‐resolution gamma spectrometry following the standard procedures: pulverizing, heating to 450 °C for 24 h to remove organic material (only for associated material) and casting with wax to provide a reproducible counting geometry and to prevent radon loss (Murray et al . ).…”

Section: Methodsmentioning

confidence: 97%

“…238 U, 232 Th, 226 Ra and 40 K) using high‐resolution gamma spectrometry (Murray et al . , ). K‐rich areas on the cobble slices were identified using a Bruker M4 Tornado micro‐XRF spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Luminescence dating of buried cobble surfaces from sandy beach ridges: a case study from Denmark

Souza

Sohbati

Murray

et al. 2019

Boreas

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Here we investigate the use of optically stimulated luminescence (OSL) for dating cobbles from the body of successive beach ridges and compare cobble surface‐derived ages to standard quartz OSL ages from sand. Between four and eight cobbles and sand samples (age control) were dated with the luminescence method, taken from the modern beach and from beach ridges on the south and north extremes of a prograding spit on the westernmost coast of Lolland, Denmark. Luminescence‐depth profiles perpendicular to the surfaces of the cobbles show that the feldspar infrared signals stimulated at 50 °C were fully reset to various depths into the cobbles prior to final deposition; as a result, the equivalent doses determined from close to the surface of such cobbles can be used to calculate burial ages. Beach‐ridge burial ages given by the average of ages of individual cobbles taken from the same site are consistent, within errors, with the ages derived from the sand samples. Cobble‐ and sand‐derived ages show that the southernmost beach ridge at Albuen was formed around 2 ka ago, indicating that this sandy spit is younger than other coastal systems in Denmark. The agreement between ages derived from clasts and from standard quartz OSL in this study confirms that, even in the absence of sandy sediments, we can reliably date sites using OSL by targeting larger clasts. In addition, the record of prior light exposure contained in the shape of the cobbles’ luminescence‐depth profile removes one of the major uncertainties (i.e. the degree of signal reset prior to burial) in the luminescence dating of high latitude sites.

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“…Dose rates were determined using high-resolution gamma spectrometry calibrated as described in Murray et al (1987Murray et al ( , 2018 and the conversion factors of Guérin et al (2011). Before counting, crushed and homogenised samples were mixed with wax, cast in a fixed cup-shaped geometry, and stored for a minimum of 21 days (>5 222 Rn half-lives) to ensure equilibrium between 222 Rn and 226 Ra.…”

Section: Age Determinationmentioning

confidence: 99%

Timing of the Middle-to-Upper Palaeolithic transition in the Iberian inland (Cardina-Salto do Boi, Côa Valley, Portugal)

Aubry

Dimuccio

Barbosa³

et al. 2020

Quat. res.

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The timing of the Neanderthal-associated Middle Palaeolithic demise and a possible overlap with anatomically modern humans (AMH) in some regions of Eurasia continues to be debated. The Iberian Peninsula is considered a possible refuge zone for the last Neanderthals, but the chronology of the later Middle Palaeolithic record has undergone revision and has increased the debate on the timing of Neanderthal extinction. Here we report on a study of the 5-m-thick archaeological stratigraphy of the Cardina-Salto do Boi, an open-air site located in inland Iberia, from which optically stimulated luminescence (OSL) ages were obtained for Middle and Upper Palaeolithic occupations preserved in overbank alluvial deposits. Geomorphology, archaeostratigraphy, stone-tool evolution, and OSL dating support the persistence of Neanderthals after 41 ka in central Iberia; the transition between the Middle Palaeolithic material culture and the AMH-associated Aurignacian blade and bladelet production is estimated to lie between 34.0 ± 2.0 ka and 38.4 ± 1.9 ka. Our results demonstrate that investigations focusing on different geomorphological situations are necessary to overcome the current limitations of the evidence and to establish more consistent models for Neanderthal disappearance and AMH expansion in the Iberian Peninsula.

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Measurement of natural radioactivity: Calibration and performance of a high-resolution gamma spectrometry facility

Cited by 81 publications

References 9 publications

Glacial history and palaeo-environmental change of southern Taimyr Peninsula, Arctic Russia, during the Middle and Late Pleistocene

Glacial history and palaeo-environmental change of southern Taimyr Peninsula, Arctic Russia, during the Middle and Late Pleistocene

Luminescence dating of buried cobble surfaces from sandy beach ridges: a case study from Denmark

Timing of the Middle-to-Upper Palaeolithic transition in the Iberian inland (Cardina-Salto do Boi, Côa Valley, Portugal)

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