An analytical model for the growth of ESR signals

doi:10.1016/1359-0189(88)90070-2

International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements

Volume 14, Issues 1–2, 1988, Pages 231-235

https://doi.org/10.1016/1359-0189(88)90070-2 Get rights and content

Abstract

We have developed an analytical model for the time- and dose-dependency of ESR signals in calcite. The model describes well the observed natural growth and the growth by artificial irradiation of ESR-signals (g = 2.0034 and g = 2.0006) in deep-sea foraminifera. The model shows how to derive the archaeological dose from the artificial growth curve of ESR signals. Applying the model we have determined the lifetime of the signal at g = 2.0006 to be about 350 ka at 2°C. The thermal decay of the traps responsible for that signal was shown by heating experiments.

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ESR-dating in quarternary geology
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ESR signals in a variety of speleothem calcites and their suitability for dating
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Possibility of ESR-dating without determination of the annual dose
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Cited by (31)

The upper dating limit of the ESR signal at g=2.0006 in recrystallized carbonates
2022, Radiation Measurements
Citation Excerpt :
The saturation is an important factor that limits the upper dating limit of ESR signals. In general, the ESR signal intensities tend to approach a maximum value (Imax) on irradiation, which is interpreted that a crystal contains only a limited number of traps that can be filled (Barabas et al., 1988). Therefore, the saturation value is proportional to the total number of a certain trap.
Determining the upper dating limits of electron spin resonance (ESR) signals is essential to assess the reliability of ESR ages. Saturation and thermal lifetime are mainly factors that constrain the upper dating limit of ESR signals. In this study, we investigated the saturation dose (D₀) and thermal lifetime of the signal at g = 2.0006 in recrystallized carbonates produced by faulting, which is accepted to be the most reliable ESR signal for dating of carbonates, to determine the upper dating limit of this signal. The D₀ was obtained by establishing the dose-response curves on irradiation. Among the four fitting functions (SSE, DSE, EXP + LIN, and Dgamma), the EXP + LIN function provide the best approximation to the data points. Consequently, the D₀ range is around 1100–2600 Gy, which limits the reliable equivalent dose (D_E) range to about 350–900 Gy for this signal. Thus, by dividing the maximum D_E and the dose rate, we obtained an upper dating limit of 0.9–2.3 Ma for this signal derived from the D₀. Annealing experiments show that the ESR signal at g = 2.0006 contains two components with different thermal stability, one of which has a short lifetime of around 20 ka (20 °C), while the other has a long lifetime of ∼8 Ma (20 °C). In summary, after taking into account both saturation dose (D₀) and lifetime, the upper dating limit of this signal in recrystallized carbonates is about 1 Ma.
ESR dating of Soma (Manisa, West Anatolia - Turkey) fossil gastropoda shells
2006, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Electron spin resonance (ESR) spectroscopy technique has been employed to date the aragonitic fresh-water gastropod shells (Melanoides curvicosta) collected from Soma (Manisa) district (West Anatolia) of Turkey. The influence of the annealing temperature and γ-radiation dose on dating signal at g = 2.0016 is investigated. The thermal stability and dose response of the ESR signals were found to be suitable for an age determination using a signal at g = 2.0016. The activation energy (E), frequency factor (s) and mean-lifetime (τ) at 15 °C of the g = 2.0016 center were calculated to be 1.67 ± 0.01 eV, (3.6 ± 0.7) × 10¹³ s⁻¹ and 2.02 × 10⁸ years, respectively. The ESR signal growth curve on additional γ-irradiation has been best fitted by an exponential saturation function. Based on this model, accumulated dose (AD) value for dating is obtained. We have determined the ESR age of the terrestrial gastropods to be 2.57 ± 0.30 Ma. The results show that the ESR age falls into the Late Pliocene (Romanian) epoch of the geological time scale, which agreed with the paleoecological and paleogeographic distribution and stratigraphic level of the fauna.
Equivalent dose determination in foraminifera: Analytical description of the CO<inf>2</inf>--signal dose-response curve
2003, Radiation Measurements
The dose–response of the CO₂⁻-signal (g=2.0006) in foraminifera with ages between 19 and $300 ka$ is investigated. The sum of two exponential saturation functions is an adequate function to describe the dose–response curve up to an additional dose of $8000 Gy$ . It yields excellent dating results but requires an artificial dose of at least $5000 Gy$ . For small additional doses of about $500 Gy$ the single exponential saturation function can be used to calculate a reliable equivalent dose D_E, although it does not describe the dose–response for higher doses.
The CO₂⁻-signal dose–response indicates that the signal has two components of which one is less stable than the other.
ESR-dating of the Arctic sediment core PS1535 dose-response and thermal behaviour of the CO-<inf>2</inf>-signal in foraminifera
2001, Quaternary Science Reviews
ESR-spectra of foraminifera in arctic sediment cores display the CO₂⁻-signal (g=2.0006). Research on the thermal behaviour of the CO₂⁻-signal shows that both natural and artificial irradiation generates a precursor and a thermal unstable component of the CO₂⁻-signal. The precursor can be transfered to the stable radical, and unstable radicals can be removed by heating. The signal-change by heating depends on the irradiation dose. Because of the varying response on thermal treatment, the dose-response curves show systematic differences depending on the applied procedure (single- or multi-aliquot method with or without heating). A model for the description of the CO₂⁻-signal-change is presented. The combination of two exponential saturation functions seems to be an adequate analytical description of the dose-response curve of the CO₂⁻-signal in foraminifera. Due to the limited thermal stability this signal can be used for dating foraminifera with ages up to about 190 ka.
An analytical model for the SO<inf>2</inf>/- centre, ESR signal at g = 2.0057 in carbonates
2001, Applied Radiation and Isotopes
Detailed experiments were conducted to test the behaviour of the ESR signal at the g-value of 2.0057 in corals after irradiation and heating. On the basis of the results an analytical model for this signal was developed. We assume the existence of a precursor to the SO₂⁻ radical. On irradiation traps are produced, some in the precursor state and some in the radical state. Heating then causes transfer of electrons into the precursor state, from the precursor state into the radical state and out of the radical state into a base state. On the base of this model, we suggest that the signal at g=2.0057 can be applied for dating. Our first dating attempts on corals delivered promising results for the suggested procedure.
Electron spin resonance (ESR) studies of CO-<inf>2</inf> radicals in irradiated A and B-type carbonate-containing apatites
2000, Applied Radiation and Isotopes
ESR spectra of irradiated carbonate-containing hydroxyapatites are complex and strongly dependent on the method of preparation of these materials. This paper describes results of our studies of the ESR spectra of irradiated A- and B-type carbonated hydroxyapatites. The most intense and stable lines in these spectra are attributed to $CO^{−}_{2}$ radicals. The ESR spectrum of A-type carbonated apatite can be predominantly due to either axial or orthorhombic $CO^{−}_{2}$ species, depending on whether the apatite was cooled in or without a CO₂ flow. The B-type carbonated apatite has an ESR spectrum composed basically of signals from isotropic and orthorhombic $CO^{−}_{2}$ species. These signals are different in intensity, line width, and g-factor for samples heated for 3 h at 200, 400 and 600°C. The effect of the method of preparation of the A- and B-type carbonated apatites on the ESR spectra and the application of these materials to the ESR dating and dosimetry are discussed.

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International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements

Abstract

References (12)

The age of the Holstein Interglaciation. A reply

Quartern. Res.

ESR-dating in quarternary geology

Quatern. Sci. Rev.

Progress in ESR-studies on CaCO₃ of deep sea sediments

Nucl. Tracks

ESR signals in a variety of speleothem calcites and their suitability for dating

Nucl. Tracks

Thermoluminescent Dosimetry

Possibility of ESR-dating without determination of the annual dose

J. Radioanal. Nucl. Chem. Lett.

Cited by (31)

The upper dating limit of the ESR signal at g=2.0006 in recrystallized carbonates

ESR dating of Soma (Manisa, West Anatolia - Turkey) fossil gastropoda shells

Equivalent dose determination in foraminifera: Analytical description of the CO<inf>2</inf><sup>-</sup>-signal dose-response curve

ESR-dating of the Arctic sediment core PS1535 dose-response and thermal behaviour of the CO<sup>-</sup><inf>2</inf>-signal in foraminifera

An analytical model for the SO<inf>2</inf>/<sup>-</sup> centre, ESR signal at g = 2.0057 in carbonates

Electron spin resonance (ESR) studies of CO<sup>-</sup><inf>2</inf> radicals in irradiated A and B-type carbonate-containing apatites