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  1. AU="Ambrožová, I."
  2. AU="William, Doreen"
  3. AU="Gutiérrez-Sánchez, A M"
  4. AU="Bohan, Dana"
  5. AU="Spracklen, D."
  6. AU="Lobo, Brian C"
  7. AU=Zhuang Jianjian AU=Zhuang Jianjian
  8. AU=Pathanki Adithya M
  9. AU="Armando Vilchis-Ordoñez"
  10. AU="Zhongfu Lu"
  11. AU="Lo, Hong-Yip"
  12. AU="Ziman Xiong"
  13. AU="Oakes, Allison H"
  14. AU="Ma, Shaotong"
  15. AU="Zang, Lili"
  16. AU="Adams Brian D"
  17. AU="Maria Papaioannou"
  18. AU="Kollia, Georgia"
  19. AU="Auxiette, Catherine"
  20. AU="Guzmán, Luis"
  21. AU="Alipour, Elnaz"
  22. AU="Queiroz, Dayanna Joyce Marques"
  23. AU="Ramamurthy, Santosh"
  24. AU="Xueying Huang"
  25. AU="Cromwell, Howard C"
  26. AU="Spence, John C H"
  27. AU="Chapinal, Libertad"
  28. AU=Rohaim Mohammed A AU=Rohaim Mohammed A
  29. AU=Hempel Cornelius

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  1. Artikel ; Online: CHARACTERISATION OF AIRDOS-C DETECTOR FOR MEASUREMENT OF HIGH-ENERGY EVENTS IN THE ATMOSPHERE.

    Velychko, Olena / Ambrožová, Iva / Kákona, Martin / Ploc, Ondřej

    Radiation protection dosimetry

    2022  Band 198, Heft 9-11, Seite(n) 604–610

    Abstract: At the flight altitudes of modern airplanes, cosmic rays intensity is several times higher than on the Earth's surface. The radiation field is not constant in time and due to various effects, not routinely considered in calculations, the exposure can ... ...

    Abstract At the flight altitudes of modern airplanes, cosmic rays intensity is several times higher than on the Earth's surface. The radiation field is not constant in time and due to various effects, not routinely considered in calculations, the exposure can increase several times. Therefore, a continuous monitoring of radiation exposure on board is required. This article characterises newly developed detectors Airdos-C with diverse scintillation crystals. Unlike detectors based on a Si diode, which are commonly used for long-term measurements, these detectors can also be used for detection of high-energy gamma-rays generated in thunderstorms. For a correct interpretation of the measured data it is important to perform an energy calibration and to verify the detector response in known radiation fields. The results obtained with several radionuclide sources were analysed using mathematical statistics methods. The detectors were also exposed onboard aircraft under well-defined conditions.
    Sprache Englisch
    Erscheinungsdatum 2022-08-22
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 225912-6
    ISSN 1742-3406 ; 0144-8420
    ISSN (online) 1742-3406
    ISSN 0144-8420
    DOI 10.1093/rpd/ncac105
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  2. Artikel ; Online: Radiation environment in high-altitude Antarctic plateau: Recent measurements and model studies.

    Mishev, A L / Kodaira, S / Kitamura, H / Ploc, O / Ambrožová, I / Tolochek, R V / Kartsev, I S / Shurshakov, V A / Artamonov, A A / Inozemtsev, K O

    The Science of the total environment

    2023  Band 890, Seite(n) 164304

    Abstract: Polar regions are the most exposed to secondary particles and radiation produced by primary cosmic rays in the atmosphere, because naturally they are with marginal geomagnetic shielding. In addition, the secondary particle flux contributing to the ... ...

    Abstract Polar regions are the most exposed to secondary particles and radiation produced by primary cosmic rays in the atmosphere, because naturally they are with marginal geomagnetic shielding. In addition, the secondary particle flux contributing to the complex radiation field is enhanced at high-mountain altitudes compared to sea level because of the reduced atmospheric attenuation. At present, there are very few systematic experimental measurements of environmental dose at high southern latitudes, specifically at high-altitude region. Here, we report a campaign of measurements with different devices, that is passive and Liulin-type dosimeters, of the radiation background at high-mountain Antarctic station Vostok (3488 m above sea level, 78° 27' S; 106° 50' E). We compare the measurements with a Monte Carlo-based model for the propagation of the cosmic rays through the atmosphere and assessment of the radiation field in the atmosphere. We employed the model to estimate the radiation dose at Vostok station during the ground-level enhancement at 28 October 2021. As in previous studies by other teams, we show that the annual dose equivalent at high-altitude Antarctic facilities can significantly exceed the limit of 1 mSv established for the general population by the ICRP.
    Mesh-Begriff(e) Humans ; Radiation Monitoring ; Altitude ; Antarctic Regions ; Cosmic Radiation ; Atmosphere ; Radiation Dosage ; Aircraft
    Sprache Englisch
    Erscheinungsdatum 2023-05-23
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2023.164304
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: CALIBRATION OF SILICON DETECTORS LIULIN AND AIRDOS USING COSMIC RAYS AND TIMEPIX FOR USE AT FLIGHT ALTITUDES.

    Sommer, Marek / Štěpánová, Dagmar / Kákona, Martin / Velychko, Olena / Ambrožová, Iva / Ploc, Ondřej

    Radiation protection dosimetry

    2022  Band 198, Heft 9-11, Seite(n) 597–603

    Abstract: Silicon detectors such as Liulin and AIRDOS are used for cosmic radiation measurements onboard aircraft. These measurements can be used for the verification of computer programs assessing aircraft crew radiation exposure. Recently performed ... ...

    Abstract Silicon detectors such as Liulin and AIRDOS are used for cosmic radiation measurements onboard aircraft. These measurements can be used for the verification of computer programs assessing aircraft crew radiation exposure. Recently performed intercomparison flights showed large variances of absorbed doses among individual detectors and significant differences between results of silicon detectors and computer programs. In order to explain for these differences, we have developed energy calibration method that can be performed on short flights. The method is based on cross-calibration of Liulin and AIRDOS deposited energy spectra with deposited energy spectra measured by Timepix which has superior detection properties in terms of energy resolution and the detection threshold. Moreover, the portion of dose which is omitted due to low sensitivity for low-energy deposits was calculated. The resulting absorbed dose rates at two intercomparison flights show significantly improved variation of results and better agreement with modelled absorbed dose rates.
    Mesh-Begriff(e) Aircraft ; Altitude ; Calibration ; Cosmic Radiation ; Occupational Exposure/analysis ; Radiation Dosage ; Radiation Monitoring/methods ; Radiometry/methods ; Silicon
    Chemische Substanzen Silicon (Z4152N8IUI)
    Sprache Englisch
    Erscheinungsdatum 2022-08-08
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 225912-6
    ISSN 1742-3406 ; 0144-8420
    ISSN (online) 1742-3406
    ISSN 0144-8420
    DOI 10.1093/rpd/ncac104
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  4. Artikel ; Online: Neutron dose assessment in laser-generated ultra-short pulsed fields.

    Olšovcová, Veronika / Ambrožová, Iva / Cimmino, Anna / Horváth, Dávid / Lefebvre, Benoit / Ploc, Ondřej / Stránský, Vojtěch / Truneček, Roman / Versaci, Roberto

    Radiation protection dosimetry

    2023  Band 199, Heft 15-16, Seite(n) 1910–1916

    Abstract: ELI Beamlines is one of the pillars of the Extreme Light Infrastructure European Research Infrastructure Consortium (ELI ERIC), the European project aiming at building the next generation of high power lasers for fundamental research and industrial ... ...

    Abstract ELI Beamlines is one of the pillars of the Extreme Light Infrastructure European Research Infrastructure Consortium (ELI ERIC), the European project aiming at building the next generation of high power lasers for fundamental research and industrial applications. Several high-power lasers are hosted by the ELI Beamlines facility. Even at a power lower than the nominal one, when interacting with a target, the laser can generate mixed ionizing radiation fields of unique nature. One of the major laser systems, High-repetition-rate advanced petawatt laser system (HAPLS) was already used in commissioning experiments. Detecting the neutrons generated during these experiments has been a challenging task, since certain difficulties were faced. First, the experimental conditions were frequently altered during the commissioning phase (such as laser beam parameters, experimental geometry or target type). Next, the extremely short duration of the ionizing radiation pulse generated by the laser (~10-14 s) complicated the correct interpretation of the data provided by the detectors designed and calibrated in standard fields. Here, one commissioning experiment is described, together with the means of addressing the problem of the detection of the ionizing radiation and the lessons learned in this endeavour.
    Mesh-Begriff(e) Synchrotrons ; Radiation, Ionizing ; Lasers ; Neutrons
    Sprache Englisch
    Erscheinungsdatum 2023-10-11
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 225912-6
    ISSN 1742-3406 ; 0144-8420
    ISSN (online) 1742-3406
    ISSN 0144-8420
    DOI 10.1093/rpd/ncac221
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  5. Artikel ; Online: Latitudinal effect on the position of Regener-Pfotzer maximum investigated by balloon flight HEMERA 2019 in Sweden and balloon flights FIK in Czechia.

    Ambrožová, Iva / Kákona, Martin / Dvořák, Roman / Kákona, Jakub / Lužová, Martina / Povišer, Martin / Sommer, Marek / Velychko, Olena / Ploc, Ondřej

    Radiation protection dosimetry

    2023  Band 199, Heft 15-16, Seite(n) 2041–2046

    Abstract: When primary space radiation particles enter into the atmosphere of the Earth, they generate showers of secondary radiation. The intensity of secondary radiation reaches its maximum, called the Regener-Pfotzer maximum; its exact position depends on the ... ...

    Abstract When primary space radiation particles enter into the atmosphere of the Earth, they generate showers of secondary radiation. The intensity of secondary radiation reaches its maximum, called the Regener-Pfotzer maximum; its exact position depends on the geomagnetic effective vertical cut-off rigidity, the phase of the solar cycle and also on the type of detected particles. In this paper, several balloon flight experiments are described focusing on the study of the latitudinal effect on the position of the Regener-Pfotzer maximum. Altitude profile of ionization in the atmosphere was measured using radiation detectors flown during several flights at locations with different effective vertical cut-off rigidities (flight HEMERA over Sweden and flights FIK-5 and FIK-6 over Czech Republic). The measured results are supplemented also with simulations using EXPACS 4.11 and the variation of obtained positions of Regener-Pfotzer maximum is discussed.
    Mesh-Begriff(e) Cosmic Radiation ; Czech Republic ; Radiation Dosage ; Sweden ; Aircraft ; Space Flight ; Radiation Monitoring/methods ; Solar Activity
    Sprache Englisch
    Erscheinungsdatum 2023-10-24
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 225912-6
    ISSN 1742-3406 ; 0144-8420
    ISSN (online) 1742-3406
    ISSN 0144-8420
    DOI 10.1093/rpd/ncac299
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  6. Artikel ; Online: Radiation environment in high-altitude Antarctic plateau: Recent measurements and model studies

    Mishev, A.L. / Kodaira, S. / Kitamura, H. / Ploc, O. / Ambrožová, I. / Tolochek, R.V. / Kartsev, I.S. / Shurshakov, V.A. / Artamonov, A.A. / Inozemtsev, K.O.

    Science of the Total Environment. 2023 Sept., v. 890 p.164304-

    2023  

    Abstract: Polar regions are the most exposed to secondary particles and radiation produced by primary cosmic rays in the atmosphere, because naturally they are with marginal geomagnetic shielding. In addition, the secondary particle flux contributing to the ... ...

    Abstract Polar regions are the most exposed to secondary particles and radiation produced by primary cosmic rays in the atmosphere, because naturally they are with marginal geomagnetic shielding. In addition, the secondary particle flux contributing to the complex radiation field is enhanced at high-mountain altitudes compared to sea level because of the reduced atmospheric attenuation. At present, there are very few systematic experimental measurements of environmental dose at high southern latitudes, specifically at high-altitude region. Here, we report a campaign of measurements with different devices, that is passive and Liulin-type dosimeters, of the radiation background at high-mountain Antarctic station Vostok (3488 m above sea level, 78° 27′ S; 106° 50′ E). We compare the measurements with a Monte Carlo-based model for the propagation of the cosmic rays through the atmosphere and assessment of the radiation field in the atmosphere. We employed the model to estimate the radiation dose at Vostok station during the ground-level enhancement at 28 October 2021. As in previous studies by other teams, we show that the annual dose equivalent at high-altitude Antarctic facilities can significantly exceed the limit of 1 mSv established for the general population by the ICRP.
    Schlagwörter altitude ; models ; sea level ; Antarctic region ; Antarctica ; Personnel dosimetry ; Passive detectors ; Liulin dosimeter ; High altitudes ; Cosmic rays ; Natural radiation background ; Ground-level enhancement
    Sprache Englisch
    Erscheinungsverlauf 2023-09
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel ; Online
    Anmerkung Use and reproduction
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2023.164304
    Datenquelle NAL Katalog (AGRICOLA)

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  7. Artikel ; Online: RESPONSE OF THE CZECH RMN NETWORK TO THUNDERSTORM ACTIVITY.

    Šlegl, J / Minářová, J / Kuča, P / Kolmašová, I / Santolík, O / Sokol, Z / Reitz, G / Ambrožová, I / Ploc, O

    Radiation protection dosimetry

    2020  Band 186, Heft 2-3, Seite(n) 215–218

    Abstract: Thunderstorm ground enhancement (TGE) is a phenomenon that enhances radiation background on the ground related to thunderstorm activity and charge structure of the thundercloud. On the other hand, the rise of gamma background is connected with ... ...

    Abstract Thunderstorm ground enhancement (TGE) is a phenomenon that enhances radiation background on the ground related to thunderstorm activity and charge structure of the thundercloud. On the other hand, the rise of gamma background is connected with precipitation by the washout of radon progeny from the atmosphere. In our analysis, we examined known enhancements of gamma background, previously attributed solely to radon progeny, using data from the Czech Radiation Monitoring Network (RMN) to investigate the enhancements with respect to thunderstorms and TGE phenomena. We also used radar precipitation data and data from the lightning location network to analyze their influences on the radiation background enhancement during three thunderstorm events that occurred in summer 2016 over the Czech Republic (Central Europe). We state that the RMN might have detected TGE over the Czech Republic.
    Mesh-Begriff(e) Atmosphere ; Czech Republic ; Gamma Rays ; Geography ; Radiation Monitoring/instrumentation ; Radiation Monitoring/methods ; Radon/analysis ; Radon Daughters/analysis ; Rain ; Seasons ; Weather
    Chemische Substanzen Radon Daughters ; Radon (Q74S4N8N1G)
    Sprache Englisch
    Erscheinungsdatum 2020-01-06
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 225912-6
    ISSN 1742-3406 ; 0144-8420
    ISSN (online) 1742-3406
    ISSN 0144-8420
    DOI 10.1093/rpd/ncz205
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  8. Artikel ; Online: Perturbations of radiation field caused by titanium dental implants in pencil proton beam therapy.

    Oancea, C / Luu, A / Ambrožová, I / Mytsin, G / Vondráček, V / Davídková, M

    Physics in medicine and biology

    2018  Band 63, Heft 21, Seite(n) 215020

    Abstract: The aim of this study was to investigate the absorbed dose and the linear energy transfer (LET) of a scanning proton pencil beam at the Proton Therapy Center Czech, applied to phantoms containing metal implants. We investigated two different phantoms ... ...

    Abstract The aim of this study was to investigate the absorbed dose and the linear energy transfer (LET) of a scanning proton pencil beam at the Proton Therapy Center Czech, applied to phantoms containing metal implants. We investigated two different phantoms composed of commonly used metals with a known chemical composition. Two rectangular phantoms consisted of water-equivalent environment material with a 65 mm thickness surrounding the 2, 5, 10 and 15 mm inserts of grade-2 and grade-5 Titanium. Track-etched detectors (TEDs) were placed behind the phantoms to gather the data. The measured LET spectra behind the implants were compared with Monte Carlo simulations using the Geant4 toolkit, version 10.03.p01. The simulations were used to provide additional information regarding the contribution of each type of particles to the LET spectra (protons, alpha particles, deuteron, neutrons, photons, and electrons) and to estimate the LET spectra above the TED's detection threshold. We used two different beam energies to study the most pertinent irradiation scenarios, one in the Bragg curve plateau and one at the maximum. The measurement of the LET spectra behind phantoms irradiated with a proton beam in the plateau region of the Bragg curve led to the detection of numerous particles with a very high LET. Lateral dose enhancement at the border between implants and the plastic material was detected when the phantoms were exposed to a proton beam and the data were recorded in the Bragg peak maximum. In this area, the dose increased 13 times for grade-2 Ti and 12 times for grade-5 Ti. The performed experimental study highlights the effect of dental implants on the LET spectra and absorbed dose when a proton pencil beam is crossing high-density titanium.
    Mesh-Begriff(e) Artifacts ; Dental Implants ; Humans ; Linear Energy Transfer ; Monte Carlo Method ; Phantoms, Imaging ; Proton Therapy ; Radiometry ; Titanium
    Chemische Substanzen Dental Implants ; Titanium (D1JT611TNE)
    Sprache Englisch
    Erscheinungsdatum 2018-10-29
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208857-5
    ISSN 1361-6560 ; 0031-9155
    ISSN (online) 1361-6560
    ISSN 0031-9155
    DOI 10.1088/1361-6560/aae656
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  9. Artikel ; Online: MEASUREMENT OF THE REGENER-PFOTZER MAXIMUM USING DIFFERENT TYPES OF IONISING RADIATION DETECTORS AND A NEW TELEMETRY SYSTEM TF-ATMON.

    Kákona, Jakub / Lužová, Martina / Kákona, Martin / Sommer, Marek / Povišer, Martin / Ploc, Ondřej / Dvořák, Roman / Ambrožová, Iva

    Radiation protection dosimetry

    2022  Band 198, Heft 9-11, Seite(n) 712–719

    Abstract: Stratospheric balloons are a useful tool for the investigation of cosmic radiation at high altitudes and the tests of new detectors of cosmic radiation. Due to necessary data processing, the balloon gondola needs to carry, together with radiation ... ...

    Abstract Stratospheric balloons are a useful tool for the investigation of cosmic radiation at high altitudes and the tests of new detectors of cosmic radiation. Due to necessary data processing, the balloon gondola needs to carry, together with radiation detectors, additional supplementary sensors measuring humidity, temperature, location and orientation, altitude, atmospheric pressure, acceleration, etc. A newly developed universal system TF-ATMON, based on using already existing tools of the PX4 open-source project, enables apart from data recording and monitoring, also the possibility to trace the balloon gondola after the flight. The application was demonstrated on stratospheric balloon flight FIK-6. This flight was unique because three different types of radiation detectors were used at one flight. It enabled us to compare the altitude of the Regener-Pfotzer maximum measured with different types of sensors sensitive to a different type of secondary cosmic radiation generated in the atmosphere.
    Mesh-Begriff(e) Aircraft ; Altitude ; Cosmic Radiation ; Radiation Dosage ; Radiation Monitoring ; Telemetry
    Sprache Englisch
    Erscheinungsdatum 2022-08-08
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 225912-6
    ISSN 1742-3406 ; 0144-8420
    ISSN (online) 1742-3406
    ISSN 0144-8420
    DOI 10.1093/rpd/ncac124
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  10. Artikel ; Online: SPECTROMETRY OF HIGH-ENERGY PHOTONS ON HIGH MOUNTAIN OBSERVATORY LOMNICKÝ ŠTÍT DURING THUNDERSTORMS.

    Šlegl, Jakub / Langer, Ronald / Brunclík, Tomáš / Mašek, Petr / Strhárský, Igor / Ambrožová, Iva / Chum, Jaroslav / Ploc, Ondřej

    Radiation protection dosimetry

    2022  Band 198, Heft 9-11, Seite(n) 623–627

    Abstract: Lomnický štít, Slovakia, 2634 m above sea level, is known to be a place of extreme electric fields measured during thunderstorms and is thus a suitable place for thunderstorm-related ionising radiation research. We present one of the strongest ... ...

    Abstract Lomnický štít, Slovakia, 2634 m above sea level, is known to be a place of extreme electric fields measured during thunderstorms and is thus a suitable place for thunderstorm-related ionising radiation research. We present one of the strongest Thunderstorm ground enhancements (TGE) ever detected, which occurred on 12 September 2021. The TGE was detected with the SEVAN detector and also with the new Georadis RT-56 large volume gamma spectrometer. In the paper, we present spectra of the TGE measured with the spectrometer as well as SEVAN coincidence data supplemented by the data from electric field mill.
    Sprache Englisch
    Erscheinungsdatum 2022-08-22
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 225912-6
    ISSN 1742-3406 ; 0144-8420
    ISSN (online) 1742-3406
    ISSN 0144-8420
    DOI 10.1093/rpd/ncac108
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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