Mineral zircon: A novel thermoluminescence geochronometer

Es, H.J. van; Vainshtein, D.I.; Meijer, R.J. de; Hartog, H. W. den; Donoghue, Joseph F.; Rozendaal, A.

doi:10.1080/10420150215783

Cited by 14 publications

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“…TL intensity (arb.units) zircon grains (75-100 µm) of high optical quality have been extracted from dune sand sediments using special procedures that include sieving, magnetic separation, and electrostatic separation/selection [2]. The experimental results are essentially the same for the two types of samples, which have been studied in this investigation.…”

Section: Temperature ( O C)mentioning

confidence: 95%

“…After gamma-irradiation at room temperature the TL curve shows additional features ( Fig. 1(a) solid curve): a strong peak at about 165 °C which is due to the Dy 3+ related shallow traps [2] and a broad TL peak in the 300-450 °C temperature range which is mainly due to deep Tb 3+ related traps [2]. The shallow traps are related to the short-term fading effects and they have been removed by a preheat treatment at about 140 °C ( Fig.…”

Section: Temperature ( O C)mentioning

confidence: 97%

“…zoning and metamictization) exist, which are responsible for intra-grain variations of the luminescence properties. Recently, these problems have been overcome by introducing a special selection procedure to obtain the most homogeneous grains of high optical quality [2]. In this way TL dating of young sediments using zircon has been successfully performed [2,3], which leads the question whether zircon can also be used for OSL dating.…”

mentioning

confidence: 99%

“…Recently, these problems have been overcome by introducing a special selection procedure to obtain the most homogeneous grains of high optical quality [2]. In this way TL dating of young sediments using zircon has been successfully performed [2,3], which leads the question whether zircon can also be used for OSL dating.In the present paper the OSL properties of mineral zircon have been studied in relationship with TL by performing OSL measurements after repeated preheats to successively higher temperatures, i.e. pulse annealing experiments and TL after OSL bleaching measurements.…”

mentioning

confidence: 99%

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Thermoluminescence and optically stimulated luminescence of gamma‐irradiated mineral zircon

Secu

Vainshtein

Turkin

et al. 2007

Phys. Status Solidi (c)

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Thermoluminescence (TL) manifested by gamma-irradiated mineral zircon has shown a strong TL peak at about 165 °C which is due to recombination of electrons and Dy 3+ related shallow hole traps. After they have been removed by a short preheat we have observed two TL peaks at 300-320 °C and ≈420 °C, which are mainly due to recombination of electrons and 1 Introduction The luminescence dating methods, TL and OSL might be useful to fill an important time gap in geochronometry, because often the last 500 ky, turn out to be inaccessible through other methods. The minerals used most frequently for luminescence dating are quartz and feldspars, because of their ubiquity and the ease to separate these minerals from sediments. In the 1970's investigators have established that mineral zircon (ZrSiO 4 ) can in principle be used for TL geochronometry (see e.g. [1]). Zircon has an advantage over other minerals, which are used for luminescence dating (quartz and feldspars), because they contain radioactive U and Th impurities, which irradiate the mineral internally at dose rates much higher than those from external environmental sources. In this way the major source of variability observed in e.g. quartz-based luminescence dating, which is due to the heterogeneity of the external irradiation field, is eliminated. However it was recognized at the same time that serious problems associated with anomalous fading and the inhomogenities of zircon (due to e.g. zoning and metamictization) exist, which are responsible for intra-grain variations of the luminescence properties. Recently, these problems have been overcome by introducing a special selection procedure to obtain the most homogeneous grains of high optical quality [2]. In this way TL dating of young sediments using zircon has been successfully performed [2,3], which leads the question whether zircon can also be used for OSL dating.In the present paper the OSL properties of mineral zircon have been studied in relationship with TL by performing OSL measurements after repeated preheats to successively higher temperatures, i.e. pulse annealing experiments and TL after OSL bleaching measurements.

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Section: Temperature ( O C)mentioning

confidence: 95%

Section: Temperature ( O C)mentioning

confidence: 97%

mentioning

confidence: 99%

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confidence: 99%

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Thermoluminescence and optically stimulated luminescence of gamma‐irradiated mineral zircon

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Vainshtein

Turkin

et al. 2007

Phys. Status Solidi (c)

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“…Esta característica del circón es de gran utilidad para la datación por termoluminiscencia (TL) ya que la determinación de la edad de una cerámica viene dada principalmente por la dosis interna recibida. La influencia de la dosis externa al material debido a los radioisótopos naturales del medioambiente, es del orden de dos órdenes de magnitud inferior a la dosis interna (7). Este hecho hace que la estimación de la dosis en materiales ricos en circón esté sujeta a menores incertidumbres.…”

Section: Introductionunclassified

Caracterización de la curva de termoluminiscencia del circón a partir de su contenido radiactivo y del análisis térmico diferencial

Correcher¹,

Robredo²,

Valle-Fuentes³

et al. 2003

Bol. Soc. Esp. Ceram. Vidr.

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El circón (ZrSiO 4 ) es un material que se utiliza habitualmente en la fabricación de refractarios, esmaltes para azulejos, pigmentos, etc. Este mineral tiene un alto contenido radiactivo debido a la presencia de emisores alfa naturales como U y Th. En este trabajo se ha determinado el contenido isotópico de estos radionucleidos ( Th) utilizando técnicas de separación radioquímicas y cuantificando la actividad mediante espectrometría alfa. Estos radioisótopos naturales producen una irradiación interna en el material cerámico que se manifiesta en sus propiedades luminiscentes lo que implica que pueda ser utilizado con fines dosimétricos. Se ha observado que la curva de termoluminiscencia (TL) del circón muestra una intensidad considerablemente mayor (más de un orden de magnitud) que la de otros silicatos medidos en idénticas condiciones. Los máximos que aparecen en la curva de TL se correlacionan con distintos puntos de inflexión que aparecen en la medida de análisis térmico diferencial (ATD), a 280, 360 y 445 o C, lo que indica que estos picos de TL aparecerán como consecuencia de: (1) procesos parciales de transiciones de fase locales y (2) fenómenos de autodifusión iónica y deshidroxilación que se producen durante el calentamiento al realizar la medida. Palabras clave: Circón, termoluminiscencia, contenido radiactivo, ATD Characterization of the thermoluminescence curve of zircon by radiactive content and differential thermal analysisZircon (ZrSiO 4 ) is a mineral widely employed in the production of refractories, pigments, glazed tiles etc. The high radioactive content of this mineral stems from the presence of natural alpha emitters as U and Th. The radioactive activity of the Th radionuclides was measured by alpha spectrometry after isolation by radiochemical techniques. The alpha-emitters uranium and thorium irradiates internally the ceramic modifying the luminescence properties, this involves a potential use for dosimetric purposes. The thermoluminescence (TL) glow curve intensity of zircon is higher than the observed in other aluminosilicates measured under the same conditions. The TL maxima appearing at 280, 360 and 445 o C are fairly well correlated with the differential thermal analysis (DTA). It suggests that this TL peaks could be linked to: (1) partial processes of local phase transitions and (2) alkali self-diffusion dehydroxylation phenomena when the sample is heated during the analytical measurement routine.Keywords: Zircon, thermoluminescence, radioactive content, DTA INTRODUCCIÓNEn la actualidad se emplea circón (ZrSiO 4 ) en la fabricación de diferentes materiales cerámicos como son: refractarios (1, 2), fritas y esmaltes como opacificante (3,4), pigmentos (5), etc. Además, se ha observado que este mineral está presente en diversos materiales cerámicos de origen arqueológico, proporcionándoles propiedades luminiscentes que hacen del circón un material susceptible de ser utilizado como dosímetro de radiación medioambiental especialmente interesante en el campo de la datación (6). En este senti...

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Simulation of optically‐stimulated luminescence of zircon

Turkin

Vainshtein

Hartog

2007

Phys. Status Solidi (c)

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PACS 78.55. Hx, 78.60.Kn, 87.66.Sq Mineral zircon, ZrSiO 4 , belongs to a class of materials that can be used as a chronological tool in geology and archaeology for measurements of the natural radiation dose and the sample age by optical methods. The model of optically stimulated luminescence developed earlier is used to investigate the applicability of the single-aliquot regenerative-dose method (SAR) for dating with zircon. Various implementations of the SAR method are considered and practical recommendations are formulated.1 Introduction Natural zircon grains are subjected to internal α-, β-and γ-irradiation due to radioactive decay of U and Th impurities [1]. Typically, the contribution of external irradiation from the surrounding materials and cosmic radiation is less than 10% of total dose rate [2]. A fraction of the radiation energy is stored in the crystal in the form of electrons and holes trapped at lattice defects. The luminescent light originates from recombination of electrons and holes released from traps during thermal or optical stimulation. This effect is used to estimate the radiation dose and the time elapsed since the sample was last heated or optically bleached. Zircon has a high signal-to-noise ratio; because, unlike other minerals (such as quartz), zircon is subjected to internal irradiation at a dose rate much higher than the dose rate from external sources. Hence, it is expected that zircon is especially suitable for dating of ultrayoung samples. Optically-stimulated luminescence (OSL) of zircon has not been studied systematically. Therefore, in this communication we investigate by computer simulation which OSL dating protocols should be used to minimize the errors in determination of the equivalent dose e D .

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Mineral zircon: A novel thermoluminescence geochronometer

Cited by 14 publications

References 14 publications

Thermoluminescence and optically stimulated luminescence of gamma‐irradiated mineral zircon

Thermoluminescence and optically stimulated luminescence of gamma‐irradiated mineral zircon

Caracterización de la curva de termoluminiscencia del circón a partir de su contenido radiactivo y del análisis térmico diferencial

Simulation of optically‐stimulated luminescence of zircon

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