Determination of Optimal Modulation Amplitude for Electron Spin Resonance (ESR) Dating and Dosimetry Studies of Tooth Enamel (original) (raw)

Using X-Ray As An Irradiation Source For Direct ESR Dating of Fossil Teeth

2021

In this paper we have tested the potential application of X-rays as an irradiation source in Electron Spin Resonance dating of tooth enamel. Both modern and fossil samples were used to assess the feasibility of dose estimations using this alternative irradiator. Equivalent doses obtained with gamma-rays on fossil powder enamel was frequently less than the doses obtained on fragments using only X-rays. It is believed that a combination of NOCORs (non-orientated CO2- radicals) and local internal dose discrepancy may be the origin of the difference. Here, we show that testing penetration attenuation for each individual irradiation source is required to accurately estimate the maximum enamel thickness and produce reliable protocols. The use of a known laboratory additive dose allows the calculation of an absorption equivalent coefficient between gamma-rays and X-rays. We conclude that X-rays are an alternative irradiation source for ESR dating protocols, however, limitations remain in p...

Evaluating the Potential of Q-Band ESR Spectroscopy for Dose Reconstruction of Fossil Tooth Enamel

PloS one, 2016

The potential of Q-band Electron Spin Resonance (ESR) for quantitative measurements has been scarcely evaluated in the literature and its application for dose reconstruction of fossil tooth enamel with dating purposes remains still quite unknown. Hence, we have performed a comparative study based on several Early to Middle Pleistocene fossil tooth samples using both X- and Q-band spectroscopies. Our results show that Q-band offers a significant improvement in terms of sensitivity and signal resolution: it allows not only to work with reduced amounts of valuable samples (< 4 mg), but also to identify different components of the main composite ESR signal. However, inherent precision of the ESR intensity measurements at Q-band is clearly lower than that achieved at X-band, highlighting the necessity to carry out repeated measurements. All dose values derived from X- and Q-band are nevertheless systematically consistent at either 1 or 2 sigma. In summary, our results indicate that Q-...

Teeth Preperation for Electron Spinning Resonance (Esr) Dating Method

PURBAWIDYA: Jurnal Penelitian dan Pengembangan Arkeologi, 2018

Fossil bones and teeth usually are very common archeological findings. At many sites these remains, such as bones bearing cut marks, may provide unequivocal evidence for human occupation. Hence bones and teeth provide the ideal targets for directly dating of archeological levels. Combined ESR/U-series dating of fossil teeth has been increasingly used in geochronological research over the past three decades. Results prove that it can be potentially applied to the sites in different geological contexts (fluvial/lacustrine or karstic environments) over a timescale of 304-206 years. But to perform this dating method, there’s a step that we need to prepare and do. This article try to explain the procedure how we prepare teeth step by step until it’s ready to be measure.