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Prasad AK, Poolton NRJ, Kook M, et al. Optical dating in a new light: A direct, non-destructive probe of trapped electrons. Sci Rep. 2017;7(1):12097doi: 10.1038/s41598-017-10174-8.
Prasad, A. K., Poolton, N. R. J., Kook, M., & Jain, M. (2017). Optical dating in a new light: A direct, non-destructive probe of trapped electrons. Scientific reports, 7(1), 12097. https://doi.org/10.1038/s41598-017-10174-8
Prasad, Amit Kumar, et al. "Optical dating in a new light: A direct, non-destructive probe of trapped electrons." Scientific reports vol. 7,1 (2017): 12097. doi: https://doi.org/10.1038/s41598-017-10174-8
Prasad AK, Poolton NRJ, Kook M, Jain M. Optical dating in a new light: A direct, non-destructive probe of trapped electrons. Sci Rep. 2017 Sep 26;7(1):12097. doi: 10.1038/s41598-017-10174-8. PMID: 28951569; PMCID: PMC5615069.
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Sci Rep. 2017 Sep 26;7(1):12097. doi: 10.1038/s41598-017-10174-8.

Optical dating in a new light: A direct, non-destructive probe of trapped electrons.

Scientific reports

Amit Kumar Prasad, Nigel R J Poolton, Myungho Kook, Mayank Jain

Affiliations

  1. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde - 4000, Denmark. [email protected].
  2. Schulich Faculty of Chemistry and Solid State Institute, Technion - Israel Institute of Technology, Haifa, 32000, Israel. [email protected].
  3. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde - 4000, Denmark.
  4. Camlin Technologies Ltd, 31 Ferguson Drive, Lisburn, County Antrim, BT28 2EX, United Kingdom.

PMID: 28951569 PMCID: PMC5615069 DOI: 10.1038/s41598-017-10174-8

Abstract

Optical dating has revolutionized our understanding of Global climate change, Earth surface processes, and human evolution and dispersal over the last ~500 ka. Optical dating is based on an anti-Stokes photon emission generated by electron-hole recombination within quartz or feldspar; it relies, by default, on destructive read-out of the stored chronometric information. We present here a fundamentally new method of optical read-out of the trapped electron population in feldspar. The new signal termed as Infra-Red Photo-Luminescence (IRPL) is a Stokes emission (~1.30 eV) derived from NIR excitation (~1.40 eV) on samples previously exposed to ionizing radiation. Low temperature (7-295 K) spectroscopic and time-resolved investigations suggest that IRPL is generated from excited-to-ground state relaxation within the principal (dosimetry) trap. Since IRPL can be induced even in traps remote from recombination centers, it is likely to contain a stable (non-fading), steady-state component. While IRPL is a powerful tool to understand details of the electron-trapping center, it provides a novel, alternative approach to trapped-charge dating based on direct, non-destructive probing of chronometric information. The possibility of repeated readout of IRPL from individual traps will open opportunities for dating at sub-micron spatial resolution, thus, marking a step change in the optical dating technology.

References

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