Effect of gamma radiation on thermostimulated exoelectron emission from Gd.sub.2./sub.O.sub.3./sub. films

0535244 - FZÚ 2021 RIV NL eng J - Journal Article
Romanova, M. - Burve, R. - Cichoň, Stanislav - Dekhtyar, Y. - Fekete, Ladislav - Jevdokimovs, D. - Krumina, A. - Palskis, K. - Serga, V.
Effect of gamma radiation on thermostimulated exoelectron emission from Gd₂O₃ films.
Nuclear Instruments & Methods in Physics Research Section B. Roč. 463, Jan (2020), s. 21-26. ISSN 0168-583X. E-ISSN 1872-9584
Institutional support: RVO:68378271
Keywords : dosimetry * exoelectron emission * gadolinium oxide * gamma radiation
OECD category: Physical chemistry
Impact factor: 1.377, year: 2020
Method of publishing: Limited access
https://doi.org/10.1016/j.nimb.2019.11.016

The effect of gamma irradiation on Gd2O3 films was studied using the thermostimulated exoelectron emission (TSEE) technique. The films were deposited on a glass and Si/SiO2 substrates using an extraction-pyrolytic method. Crystalline structure, chemical composition, film thickness and surface morphology were characterized by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The films were irradiated by 10 MeV gamma photons and TSEE was measured from the irradiated films. It was found that gamma irradiation decreases TSEE intensity and the area below TSEE spectral curves. A linear correlation between the relative decrease in the area and the delivered dose was observed in a dose range of 0–10 Gy. These findings suggest that gamma radiation might decrease the density of trapped electrons present in the as-grown Gd2O3 films or create competing electron traps that inhibit TSEE from the films.
Permanent Link: http://hdl.handle.net/11104/0313331