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Publications (10 of 11) Show all publications
Singh, S., Slavicek, T., Hodak, R., Versaci, R., Pridal, P. & Kumar, D. (2017). Absolute calibration of imaging plate detectors for electron kinetic energies between 150 keV and 1.75 MeV. Review of Scientific Instruments, 88(7)
Open this publication in new window or tab >>Absolute calibration of imaging plate detectors for electron kinetic energies between 150 keV and 1.75 MeV
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2017 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 88, no 7Article in journal (Refereed) Published
Abstract [en]

This paper presents the calibration of two different kinds of image plates (IPs) for detecting electrons with kinetic energy in the range of 150 keV-1.75 MeV. The calibration was performed using a Sr-90 beta source. The paper also provides the measured fading response for the IPs in the time range from 12 min to 18 h. Calibration results are compared to Monte Carlo simulations of energy deposited by the electrons in the sensitive layer of the IPs. It was found that within this energy range a linear relation between simulated energy deposited by the electron in the phosphor layer and the measured photo stimulated luminescence in the IP is adequate to model the response of the IP. 

Place, publisher, year, edition, pages
AMER INST PHYSICS, 2017
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-32923 (URN)10.1063/1.4993921 (DOI)
Available from: 2018-04-12 Created: 2018-04-12 Last updated: 2018-04-24Bibliographically approved
Slavicek, T. & Pospisil, S. (2017). Advanced Detectors for Better Awareness of Neutrons and Gamma Rays in Environment. MSMT
Open this publication in new window or tab >>Advanced Detectors for Better Awareness of Neutrons and Gamma Rays in Environment
2017 (English)Report (Other academic)
Place, publisher, year, edition, pages
MSMT, 2017
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-32955 (URN)
Available from: 2018-04-12 Created: 2018-04-12 Last updated: 2018-04-24Bibliographically approved
Kozyrev, A., Mitrofanov, I., Owens, A., Quarati, F., Benkhoff, J., Bakhtin, B., . . . Pospisil, S. (2016). A comparative study of LaBr3(Ce3+) and CeBr3 based gamma-ray spectrometers for planetary remote sensing applications. Review of Scientific Instruments, 87(8)
Open this publication in new window or tab >>A comparative study of LaBr3(Ce3+) and CeBr3 based gamma-ray spectrometers for planetary remote sensing applications
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2016 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 87, no 8Article in journal (Refereed) Published
Abstract [en]

The recent availability of large volume cerium bromide crystals raises the possibility of substantially improving gamma-ray spectrometer limiting flux sensitivities over current systems based on the lanthanum tri-halides, e.g., lanthanum bromide and lanthanum chloride, especially for remote sensing, low-level counting applications or any type of measurement characterized by poor signal to noise ratios. The Russian Space Research Institute has developed and manufactured a highly sensitive gamma-ray spectrometer for remote sensing observations of the planet Mercury from the Mercury Polar Orbiter (MPO), which forms part of ESA’s BepiColombo mission. The Flight Model (FM) gamma-ray spectrometer is based on a 3-in. single crystal of LaBr3(Ce3+) produced in a separate crystal development programme specifically for this mission. During the spectrometers development, manufacturing, and qualification phases, large crystals of CeBr3 became available in a subsequent phase of the same crystal development programme. Consequently, the Flight Spare Model (FSM) gamma-ray spectrometer was retrofitted with a 3-in. CeBr3 crystal and qualified for space. Except for the crystals, the two systems are essentially identical. In this paper, we report on a comparative assessment of the two systems, in terms of their respective spectral properties, as well as their suitability for use in planetary mission with respect to radiation tolerance and their propensity for activation. We also contrast their performance with a Ge detector representative of that flown on MESSENGER and show that: (a) both LaBr3(Ce3+) and CeBr3 provide superior detection systems over HPGe in the context of minimally resourced spacecraft and (b) CeBr3 is a more attractive system than LaBr3(Ce3+) in terms of sensitivities at lower gamma fluxes. Based on the tests, the FM has now been replaced by the FSM on the BepiColombo spacecraft. Thus, CeBr3 now forms the central gamma-ray detection element on the MPO spacecraft. Published by AIP Publishing.

National Category
Physical Sciences
Identifiers
urn:nbn:se:miun:diva-33521 (URN)10.1063/1.4958897 (DOI)
Available from: 2018-04-24 Created: 2018-04-24 Last updated: 2018-04-24Bibliographically approved
Slavicek, T. & Pospisil, S. (2016). Advanced Detectors for Better Awareness of Neutrons and Gamma Rays in Environment. UTEF CVUT v Praze
Open this publication in new window or tab >>Advanced Detectors for Better Awareness of Neutrons and Gamma Rays in Environment
2016 (English)Report (Other academic)
Place, publisher, year, edition, pages
UTEF CVUT v Praze, 2016
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-33069 (URN)
Available from: 2018-02-23 Created: 2018-02-23 Last updated: 2018-04-09Bibliographically approved
Slavicek, T., Pospisil, S., Masek, P., Urban, T., Trojek, T. & Kohout, Z. (2016). Development of Neutron Image Sensor Technology for AD-BANG project. In: 2016 IEEE NSS/MIC: . Paper presented at IEEE NSS/MIC/RTDS Strasbourgh.
Open this publication in new window or tab >>Development of Neutron Image Sensor Technology for AD-BANG project
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2016 (English)In: 2016 IEEE NSS/MIC, 2016Conference paper, Poster (with or without abstract) (Refereed)
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-32959 (URN)
Conference
IEEE NSS/MIC/RTDS Strasbourgh
Available from: 2018-04-12 Created: 2018-04-12 Last updated: 2018-04-24Bibliographically approved
Urban, T., Slavicek, T., Pospisil, S., Kok, A. & Trojek, T. (2016). New Neutron Detector Design Optimization by Monte Carlo Simulation. In: : . Paper presented at 2nd International Conference on Dosimetry and its Applications (ICDA-2), Guildford, UK, 3-8 July 2016.
Open this publication in new window or tab >>New Neutron Detector Design Optimization by Monte Carlo Simulation
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2016 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-33053 (URN)
Conference
2nd International Conference on Dosimetry and its Applications (ICDA-2), Guildford, UK, 3-8 July 2016
Available from: 2018-03-14 Created: 2018-03-14 Last updated: 2018-04-09Bibliographically approved
Ulyanov, A., Morris, O., Hanlon, L., Mc Breen, S., Foley, S., Roberts, O., . . . Solar, M. (2016). Performance of a monolithic LaBr3: Ce crystal coupled to an array of silicon photomultipliers. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 810(810), 107-119
Open this publication in new window or tab >>Performance of a monolithic LaBr3: Ce crystal coupled to an array of silicon photomultipliers
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2016 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 810, no 810, p. 107-119Article in journal (Refereed) Published
Abstract [en]

A gamma-ray detector composed of a single 28×28×20 mm3 LaBr3:Ce crystal coupled to a custom built 4×4 array of silicon photomultipliers was tested over an energy range of 30 keV to 9.3 MeV. The silicon photomultipliers were initially calibrated using 20 ns light pulses generated by a light emitting diode. The photodetector responses measured as a function of the number of incident photons were found to be non-linear and consistent with model predictions. Using corrections for the non-linearity of the silicon photomultipliers, the detector showed a linear response to gamma-rays with energies from 100 keV to the maximum available energy of 9.3 MeV. The energy resolution was found to be 4% FWHM at 662 keV. Despite the large thickness of the scintillator (20 mm) and a 5 mm thick optical window, the detector was capable of measuring the positions of the gamma-ray interaction points. The position resolution was measured at 356 keV and was found to be 8 mm FWHM in the detector plane and 11 mm FWHM for the depth of interaction. The detector can be used as a building block of a larger calorimeter system that is capable of measuring gamma-ray energies up to tens of MeV.

National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-33070 (URN)10.1016/j.nima.2015.11.148 (DOI)
Available from: 2018-03-14 Created: 2018-03-14 Last updated: 2018-03-16Bibliographically approved
Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Augsten, K., Caforio, D., . . . Tureček, D. (2016). Search for the Standard Model Higgs boson produced by vector-boson fusion and decaying to bottom quarks in root s=8TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (JHEP) (112)
Open this publication in new window or tab >>Search for the Standard Model Higgs boson produced by vector-boson fusion and decaying to bottom quarks in root s=8TeV pp collisions with the ATLAS detector
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2016 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 112Article in journal (Refereed) Published
Abstract [en]

A search with the ATLAS detector is presented for the Standard Model Higgs boson produced by vector-boson fusion and decaying to a pair of bottom quarks, using 20.2 fb−1 of LHC proton-proton collision data at s=8" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">s√=8s=8 TeV. The signal is searched for as a resonance in the invariant mass distribution of a pair of jets containing b-hadrons in vector-boson-fusion candidate events. The yield is measured to be −0.8 ± 2.3 times the Standard Model cross-section for a Higgs boson mass of 125 GeV. The upper limit on the cross-section times the branching ratio is found to be 4.4 times the Standard Model cross-section at the 95% confidence level, consistent with the expected limit value of 5.4 (5.7) in the background-only (Standard Model production) hypothesis.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2016
Keywords
Hadron-Hadron scattering (experiments), Higgs physics, proton-proton scattering
National Category
Subatomic Physics
Identifiers
urn:nbn:se:miun:diva-33067 (URN)10.1007/JHEP11(2016)112 (DOI)
Available from: 2018-03-14 Created: 2018-03-14 Last updated: 2018-04-11Bibliographically approved
Urban, T., Slavicek, T., Hulka, J., Kok, A., Meier, D., Masek, P., . . . Trojek, T. (2016). Stripové křemíkové senzory pro měření ve směsných neutron-gama radiačních polích. In: XXXVIII. Dny radiačni ochrany: . Paper presented at XXXVIII. Dny radiační ochrany. Mikulov, Prague, Czech Republic, 07.11.2016 - 11.11.2016.
Open this publication in new window or tab >>Stripové křemíkové senzory pro měření ve směsných neutron-gama radiačních polích
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2016 (Czech)In: XXXVIII. Dny radiačni ochrany, 2016Conference paper, Poster (with or without abstract) (Other academic)
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-33068 (URN)
Conference
XXXVIII. Dny radiační ochrany. Mikulov, Prague, Czech Republic, 07.11.2016 - 11.11.2016
Available from: 2018-03-14 Created: 2018-03-14 Last updated: 2018-04-09Bibliographically approved
Slavicek, T., Kralik, M., Krapohl, D., Petersson, S., Pospisil, S. & Thungström, G. (2012). A thermal neutron detector based on planar silicon sensor with TiB 2 coating. Journal of Instrumentation, 7(1), Art. no. C01053
Open this publication in new window or tab >>A thermal neutron detector based on planar silicon sensor with TiB 2 coating
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2012 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 7, no 1, p. Art. no. C01053-Article in journal (Refereed) Published
Abstract [en]

Neutron radiation as a non-ionizing radiation is particularly difficult to detect; therefore a conversion material is required. The conversion material converts neutrons into secondary charged particles in order for them to be detected in a silicon detector. The use of titanium diboride (TiB 2) as the conversion material deposited by an electron beam-physical vapour deposition (EB-PVD) as a part of a front-side contact of a planar silicon detector is presented. The effect of different front-side contact material compositions is discussed. The detectors behaviour was examined using alpha particles and thermal neutrons from an 241Am-Be source. Simultaneously, a Geant4 simulation was so as executed to evaluate the conversion layer functionality and to discover the conversion material thickness for the best neutron detection efficiency. © 2012 IOP Publishing Ltd and SISSA.

Keywords
Neutron detectors (cold, thermal, fast neutrons); Si microstrip and pad detectors; Solid state detectors
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-16746 (URN)10.1088/1748-0221/7/01/C01053 (DOI)000303806200053 ()2-s2.0-84856934655 (Scopus ID)STC (Local ID)STC (Archive number)STC (OAI)
Available from: 2012-08-20 Created: 2012-08-17 Last updated: 2018-02-26Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-8054-7345

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