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Publikācija: Photoelectron Emission from PbS Nanodots for Dosimetry of Electron Radiation Used in Radiation Therapy

Publication Type Conference paper
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Photoelectron Emission from PbS Nanodots for Dosimetry of Electron Radiation Used in Radiation Therapy
Field of research 1. Natural sciences
Sub-field of research 1.3 Physical sciences
Authors Marina Romanova
Diāna Krumpāne
Renata Reisfeld
Tsiala Saraidarov
Indra Surkova
Jurijs Dehtjars
Keywords PbS nanodots, radiation, dosimetry, photoelectron emission
Abstract New advances in modern radiation therapy are associated with use of high dose gradient fields. For instance, difference in surviving factor of healthy tissue and cancer tissue depends on dose gradient (C. Trainor, 2012). To achieve accurate dose delivery to the tumor, high precision of dose measurement is very important. In addition, distribution of radiation induced damage to the human DNA is of a great interest for radiobiology. Therefore, it is important to reduce size of a dosimeter which is capable to measure doses in micro and nano volumes. Moreover, the dosimeter must not be influenced by measurement process. Therefore, contactless technologies are preferable. We studied application of PbS nanodots (NDs) embedded in ZrO2 thin-film for stabilization as a dosimeter of 9 MeV electron radiation supplied by medical linear accelerator. Electron radiation was absorbed by the NDs and the non-contact readout was provided by measurement of the low energy (~0.1-1eV) photoelectron emission (PE) current from the NDs. PE was stimulated by UV photons with energy hv=4.7-6 eV. It was found that electron radiation decreased PE current I(hv) from the PbS:ZrO2 films. To investigate dose-dependent features of the PE spectra, derivatives of the PE current were calculated. Derivative maximums at UV photon energies 5.65 eV and 5.75 eV (±0.03 eV) were observed. Radiation decreased amplitudes of the maximums and this decrease correlated linearly with the dose of electron radiation. Explanation was proposed that this decrease resulted due to the loss of emission active centers in PbS NDs under influence of the electron radiation. The results of the research suggest that PbS NDs are sensitive to dose of 9 MeV medical electron radiation and have potential to provide non-contact readout of the dose by recording PE current from the NDs.
Reference Romanova, M., Krumpāne, D., Reisfeld, R., Saraidarov, T., Surkova, I., Dehtjars, J. Photoelectron Emission from PbS Nanodots for Dosimetry of Electron Radiation Used in Radiation Therapy. In: 10th International Conference on Nanosciences & Nanotechnologies (NN13): Abstract Book, Greece, Thessaloniki, 9-12 July, 2013. Thessaloniki: 2013, pp.297-297.
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