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Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra

The paper presents new knowledge on primary defect formation in tungsten (W) and iron (Fe) irradiated by fission and high-energy neutrons at near-room temperature. Using a well-established method of positron-annihilation lifetime-spectroscopy (PALS), it was found that irradiation of W in the fission...

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Autores principales: Ogorodnikova, O. V., Majerle, M., Čížek, J., Simakov, S., Gann, V. V., Hruška, P., Kameník, J., Pospíšil, J., Štefánik, M., Vinš, M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7609674/
https://www.ncbi.nlm.nih.gov/pubmed/33144640
http://dx.doi.org/10.1038/s41598-020-75737-8
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author Ogorodnikova, O. V.
Majerle, M.
Čížek, J.
Simakov, S.
Gann, V. V.
Hruška, P.
Kameník, J.
Pospíšil, J.
Štefánik, M.
Vinš, M.
author_facet Ogorodnikova, O. V.
Majerle, M.
Čížek, J.
Simakov, S.
Gann, V. V.
Hruška, P.
Kameník, J.
Pospíšil, J.
Štefánik, M.
Vinš, M.
author_sort Ogorodnikova, O. V.
collection PubMed
description The paper presents new knowledge on primary defect formation in tungsten (W) and iron (Fe) irradiated by fission and high-energy neutrons at near-room temperature. Using a well-established method of positron-annihilation lifetime-spectroscopy (PALS), it was found that irradiation of W in the fission reactor and by high-energy neutrons from the p(35 MeV)-Be generator leads to the formation of small radiation-induced vacancy clusters with comparable mean size. In the case of Fe, smaller mean size of primary radiation-induced vacancy clusters was measured after irradiation with fission neutrons compared to irradiation with high-energy neutrons from the p(35 MeV)-Be generator. It was found that one of the reasons of the formation of the larger size of the defects with lower density in Fe is lower flux in the case of irradiation with high-energy neutrons from the p(35 MeV)-Be source. The second reason is enhanced defect agglomeration and recombination within the energetic displacement cascade at high energy primary knock-on-atoms (PKAs). This is consistent with the concept of the athermal recombination corrected (arc-dpa) model, although the measured dpa cross-section of both fission neutrons and wide-spectrum high-energy neutrons in W is between the conventional Norgett–Robinson–Torrens (NRT-dpa) and arc-dpa predictions. This means that the physics of the primary radiation effects in materials is still not fully known and requires further study through a combination of modeling and experimental efforts. The present data serve as a basis for the development of an improved concept of the displacement process.
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spelling pubmed-76096742020-11-05 Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra Ogorodnikova, O. V. Majerle, M. Čížek, J. Simakov, S. Gann, V. V. Hruška, P. Kameník, J. Pospíšil, J. Štefánik, M. Vinš, M. Sci Rep Article The paper presents new knowledge on primary defect formation in tungsten (W) and iron (Fe) irradiated by fission and high-energy neutrons at near-room temperature. Using a well-established method of positron-annihilation lifetime-spectroscopy (PALS), it was found that irradiation of W in the fission reactor and by high-energy neutrons from the p(35 MeV)-Be generator leads to the formation of small radiation-induced vacancy clusters with comparable mean size. In the case of Fe, smaller mean size of primary radiation-induced vacancy clusters was measured after irradiation with fission neutrons compared to irradiation with high-energy neutrons from the p(35 MeV)-Be generator. It was found that one of the reasons of the formation of the larger size of the defects with lower density in Fe is lower flux in the case of irradiation with high-energy neutrons from the p(35 MeV)-Be source. The second reason is enhanced defect agglomeration and recombination within the energetic displacement cascade at high energy primary knock-on-atoms (PKAs). This is consistent with the concept of the athermal recombination corrected (arc-dpa) model, although the measured dpa cross-section of both fission neutrons and wide-spectrum high-energy neutrons in W is between the conventional Norgett–Robinson–Torrens (NRT-dpa) and arc-dpa predictions. This means that the physics of the primary radiation effects in materials is still not fully known and requires further study through a combination of modeling and experimental efforts. The present data serve as a basis for the development of an improved concept of the displacement process. Nature Publishing Group UK 2020-11-03 /pmc/articles/PMC7609674/ /pubmed/33144640 http://dx.doi.org/10.1038/s41598-020-75737-8 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Ogorodnikova, O. V.
Majerle, M.
Čížek, J.
Simakov, S.
Gann, V. V.
Hruška, P.
Kameník, J.
Pospíšil, J.
Štefánik, M.
Vinš, M.
Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra
title Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra
title_full Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra
title_fullStr Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra
title_full_unstemmed Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra
title_short Positron annihilation spectroscopy study of radiation-induced defects in W and Fe irradiated with neutrons with different spectra
title_sort positron annihilation spectroscopy study of radiation-induced defects in w and fe irradiated with neutrons with different spectra
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7609674/
https://www.ncbi.nlm.nih.gov/pubmed/33144640
http://dx.doi.org/10.1038/s41598-020-75737-8
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