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Publikācija: Influence of Ultraviolet and Electron Radiation on Photoelectron Emission Spectra of Lead Sulfide Nanoparticles Embedded in a Matrix of Zirconium Oxide

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Nosaukums oriģinālvalodā Influence of Ultraviolet and Electron Radiation on Photoelectron Emission Spectra of Lead Sulfide Nanoparticles Embedded in a Matrix of Zirconium Oxide
Pētniecības nozare 1. Dabaszinātnes
Pētniecības apakšnozare 1.3. Fizika un astronomija
Autori Jurijs Dehtjars
Renata Reisfeld
Marina Romanova
Tsiala Saraidarov
Indra Surkova
Atslēgas vārdi dosimetry, electron emission, ionizing radiation, lead sulphide
Anotācija Lead sulfide (PbS) nanoparticles embedded in a thin-film matrix of zirconium oxide (ZrO2), ZrO2:PbS nanofilms, were studied for application in nanodosimetry of ionizing radiation. Readout of the delivered dose was carried out by measurements of photoelectron emission (PE) current from ZrO2:PbS nanofilms. PE emission was excited by UV photons having energy of 4.6–6.2 eV. First, the nanofilms were irradiated with non-ionizing UV radiation used as a model of ionizing radiation in order to extract exposure-dependent signal from PE spectra of ZrO2:PbS nanofilms. It was found that exposure-dependent signal is provided by PbS nanoparticles and it is the decrease of the increment of PE current calculated in energy range of 4.9–5.5 eV. The extracted signal was further analyzed by irradiating ZrO2:PbS nanofilms with 9 MeV electron radiation. Second degree polynomial relationship was observed between the decrease of the increment of PE spectra calculated in the energy range of 4.9–5.5 eV and dose of electron radiation in the range of 0–10 Gy. Error of dose measurement was calculated for each delivered dose. Error of dose measurement decreases from 65% to 11% when the delivered dose increases from 2 Gy to 5 Gy and doesn’t exceed 11% in the dose range of 5–10 Gy. Changes in PE spectra of ZrO2:PbS nanofilms under influence of electron radiation suggest that the nanofilms have potential to be used in nanodosimetry of ionizing radiation; however, further adjustment of the method is required to reduce dose measurement error.
DOI: 10.1007/978-981-287-573-0_14
Hipersaite: http://link.springer.com/chapter/10.1007%2F978-981-287-573-0_14 
Atsauce Dehtjars, J., Reisfeld, R., Romanova, M., Saraidarov, T., Surkova, I. Influence of Ultraviolet and Electron Radiation on Photoelectron Emission Spectra of Lead Sulfide Nanoparticles Embedded in a Matrix of Zirconium Oxide. No: IFMBE Proceedings. Vol.50: First European Biomedical Engineering Conference for Young Investigators (ENCY2015), Ungārija, Budapest, 28.-30. maijs, 2015. Singapore: Springer Science+Business Media Singapore, 2015, 56.-59.lpp. ISBN 978-981-287-572-3. e-ISBN 978-981-287-573-0. ISSN 1680-0737. e-ISSN 1433-9277. Pieejams: doi:10.1007/978-981-287-573-0_14
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ID 20683