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Article ; Online: Determination of a Pu-Be source neutron spectrum at Czech Metrology Institute.

Rusnak, Jan / Vykydal, Zdenek

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

2021 Volume 175, Page(s) 109786

Abstract: Contrary to the radionuclide neutron sources ... ...

Abstract	Contrary to the radionuclide neutron sources of
Language	English
Publishing date	2021-05-20
Publishing country	England
Document type	Journal Article
ZDB-ID	1142596-9
ISSN	1872-9800 ; 0883-2889 ; 0969-8043
ISSN (online)	1872-9800
ISSN	0883-2889 ; 0969-8043
DOI	10.1016/j.apradiso.2021.109786
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Article ; Online: PRACTICAL METROLOGICAL ASPECTS OF NEUTRON PERSONAL DOSIMETRY.

Králík, M / Vykydal, Z

Radiation protection dosimetry

2016 Volume 170, Issue 1-4, Page(s) 54–57

Abstract: This article addresses practical issues as being faced in the process of testing, verification and calibration of passive and active personal neutron dosemeters. Namely, a limited choice of neutron sources and geometric limitations occurring when ISO ... ...

Abstract	This article addresses practical issues as being faced in the process of testing, verification and calibration of passive and active personal neutron dosemeters. Namely, a limited choice of neutron sources and geometric limitations occurring when ISO water phantom is used. The requirements of international standards for personal neutron dosemeters and the possibilities to fulfil them are discussed briefly.
MeSH term(s)	Calibration ; Humans ; Neutrons ; Occupational Exposure/analysis ; Occupational Exposure/prevention & control ; Phantoms, Imaging ; Radiation Dosage ; Radiation Monitoring/instrumentation ; Radiation Monitoring/methods ; Radiation Monitoring/standards ; Radiation Protection/instrumentation ; Radiation Protection/methods ; Radiation Protection/standards ; Reproducibility of Results ; Water
Chemical Substances	Water (059QF0KO0R)
Language	English
Publishing date	2016-09
Publishing country	England
Document type	Journal Article
ZDB-ID	225912-6
ISSN	1742-3406 ; 0144-8420
ISSN (online)	1742-3406
ISSN	0144-8420
DOI	10.1093/rpd/ncv443
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Article ; Online: Response of current dosemeters to new operational quantities in rotational geometry.

Čemusová, Zina / Ekendahl, Daniela / Kurková, Dana / Judas, Libor / Kapuciánová, Michaela / Vykydal, Zdeněk

Radiation protection dosimetry

2023 Volume 199, Issue 15-16, Page(s) 1785–1789

Abstract: Recently, the ICRU released Report 95, where new operational quantities for external radiation exposure are defined. The new quantities are defined in close relation to the protection quantities. This change affects the practice use of dosemeters. That ... ...

Abstract	Recently, the ICRU released Report 95, where new operational quantities for external radiation exposure are defined. The new quantities are defined in close relation to the protection quantities. This change affects the practice use of dosemeters. That is why the instruments must be adapted to the measurement of new quantities before their implementing as legally binding. The discrepancies depend on radiation spectra-particle type, energy of particles and direction of incidence. To analyse the performance of currently used instruments, irradiations in photon and neutron fields of various energies were performed for personal and area dosemeters. In this work, the response of photon and neutron personal dosemeters in conditions of rotational geometry is presented. The difference between the responses with respect to the new or old operational quantity was not large, which corresponded to the similar reference values for this irradiation geometry. The mutual ratio depended on the specific radiation quality and geometry. The behaviour of different types of dosemeters varied too.
MeSH term(s)	Radiation Dosage ; Radiation Monitoring/methods ; Radiation Protection/methods ; Radiation Exposure ; Photons ; Neutrons
Language	English
Publishing date	2023-10-24
Publishing country	England
Document type	Journal Article
ZDB-ID	225912-6
ISSN	1742-3406 ; 0144-8420
ISSN (online)	1742-3406
ISSN	0144-8420
DOI	10.1093/rpd/ncac281
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Article ; Online: RESPONSE OF CURRENT AREA DOSEMETERS TO NEW OPERATIONAL QUANTITIES.

Čemusová, Zina / Ekendahl, Daniela / Judas, Libor / Kapuciánová, Michaela / Kuča, Petr / Vykydal, Zdeněk

Radiation protection dosimetry

2022 Volume 198, Issue 17, Page(s) 1313–1321

Abstract: New operational quantities for external radiation exposure presented by the ICRU brought changes, which can affect the use of current dosemeters. Dosemeters calibrated in the old quantities should be tested, and the results obtained should be analyzed ... ...

Abstract	New operational quantities for external radiation exposure presented by the ICRU brought changes, which can affect the use of current dosemeters. Dosemeters calibrated in the old quantities should be tested, and the results obtained should be analyzed with respect to the new quantities. The difference between the old and new quantities depends primarily on photon energy. This work concerns instruments for area monitoring, which were exposed to reference photon and neutron spectra of mean energies from 65 to 1250 keV and from 0.02 to 10 MeV, respectively. As expected, it was revealed that the current photon dosemeters overestimate the new quantity ambient dose. For the measurements within the energy interval chosen, it seems to be acceptable to implement a correction factor to optimize the response. For the purposes of measurements of photons of lower energies, further research would be needed. To adapt the response of the neutron dosemeter tested, recalibration or redesign can be considered, but no fundamental changes seem to be necessary for the investigated spectra.
MeSH term(s)	Neutrons ; Photons ; Radiation Dosage ; Radiation Exposure ; Radiation Protection/methods
Language	English
Publishing date	2022-08-04
Publishing country	England
Document type	Journal Article
ZDB-ID	225912-6
ISSN	1742-3406 ; 0144-8420
ISSN (online)	1742-3406
ISSN	0144-8420
DOI	10.1093/rpd/ncac154
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Article ; Online: CHARACTERISATION OF THE GRAPHITE MODERATED THERMAL NEUTRON FIELD AT CMI.

Vykydal, Zdenek / Králík, Miloslav

Radiation protection dosimetry

2017 Volume 180, Issue 1-4, Page(s) 51–55

Abstract: The graphite pile was set up at CMI to provide reference thermal neutron field for metrology and dosimetry purposes. It consists of three Pu-Be and three Am-Be radionuclide sources located in a 1.95 m (width) × 1.95 m (length) × 2.0 m (height) graphite ... ...

Abstract	The graphite pile was set up at CMI to provide reference thermal neutron field for metrology and dosimetry purposes. It consists of three Pu-Be and three Am-Be radionuclide sources located in a 1.95 m (width) × 1.95 m (length) × 2.0 m (height) graphite moderator block. The neutron field in the volume of the experimental channel with dimensions of 40 cm × 40 cm × 135 cm (depth) was characterised experimentally and by Monte-Carlo calculations. Neutron fluence was determined by the activation of gold foils and Manganese tablets irradiated in nine different positions and by two 3He detectors of different construction irradiated in one position (bare and covered in three spherical PE moderators of 3, 3.5 and 4 inch diameter). Weighted mean value of the neutron fluence rate measured by all the abovementioned detectors in the pile centre was 2.91 × 104 cm-2 s-1 ± 1.8%. This value was used as a calibration factor for the Monte-Carlo model predictions. The neutron spectral fluence rate calculated by validated Monte-Carlo model was used to determine the conventionally true ambient and personal dose equivalent rates at different positions.
MeSH term(s)	Graphite/chemistry ; Monte Carlo Method ; Neutrons ; Radiation Monitoring/instrumentation ; Radiation Monitoring/methods ; Radiation Monitoring/standards ; Radiation Protection/instrumentation ; Radiation Protection/methods ; Radiation Protection/standards
Chemical Substances	Graphite (7782-42-5)
Language	English
Publishing date	2017-11-01
Publishing country	England
Document type	Journal Article
ZDB-ID	225912-6
ISSN	1742-3406 ; 0144-8420
ISSN (online)	1742-3406
ISSN	0144-8420
DOI	10.1093/rpd/ncx190
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Article ; Online: Thermal neutron detection and track recognition method in reference and out-of-field radiotherapy FLASH electron fields using Timepix3 detectors.

Oancea, Cristina / Solc, Jaroslav / Bourgouin, Alexandra / Granja, Carlos / Jakubek, Jan / Pivec, Jiri / Riemer, Felix / Vykydal, Zdenek / Worm, Steven / Marek, Lukas

Physics in medicine and biology

2023 Volume 68, Issue 18

Abstract: Objective. ...

Abstract	Objective.
MeSH term(s)	Electrons ; Algorithms ; Calibration ; Gamma Rays ; Neutrons
Language	English
Publishing date	2023-09-14
Publishing country	England
Document type	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/acf2e1
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Article ; Online: Monte Carlo modelling of pixel clusters in Timepix detectors using the MCNP code.

Šolc, Jaroslav / Jakůbek, Jan / Marek, Lukáš / Oancea, Cristina / Pivec, Jiří / Šmoldasová, Jana / Tesař, Jiří / Vykydal, Zdeněk

Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)

2022 Volume 101, Page(s) 79–86

Abstract: The track structure of the signal measured by the semiconductor pixel detector Timepix3 was modelled in the Monte Carlo MCNP® code. A detailed model at the pixel-level (256 × 256 pixels, 55 × 55 ... ...

Abstract	The track structure of the signal measured by the semiconductor pixel detector Timepix3 was modelled in the Monte Carlo MCNP® code. A detailed model at the pixel-level (256 × 256 pixels, 55 × 55 µm
Language	English
Publishing date	2022-08-16
Publishing country	Italy
Document type	Journal Article
ZDB-ID	1122650-x
ISSN	1724-191X ; 1120-1797
ISSN (online)	1724-191X
ISSN	1120-1797
DOI	10.1016/j.ejmp.2022.08.002
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Article ; Online: MEASUREMENT OF SECONDARY NEUTRONS GENERATED DURING PROTON THERAPY.

Vykydal, Z / Andrlík, M / Bártová, H / Králík, M / Šolc, J / Vondráček, V

Radiation protection dosimetry

2016 Volume 172, Issue 4, Page(s) 341–345

Abstract: Measurements described in this article were carried out with the aim of evaluating risks of the patient exposure to secondary neutrons during treatment at the Proton Therapy Centre Prague. The neutron spectral fluence was measured by means of the ... ...

Abstract	Measurements described in this article were carried out with the aim of evaluating risks of the patient exposure to secondary neutrons during treatment at the Proton Therapy Centre Prague. The neutron spectral fluence was measured by means of the extended Bonner sphere spectrometer (EBS). The article presents secondary neutron spectral fluences obtained by the EBS with passive thermoluminescent detectors, i.e. pairs of
MeSH term(s)	Humans ; Neutrons ; Phantoms, Imaging ; Proton Therapy/adverse effects ; Proton Therapy/instrumentation ; Proton Therapy/methods ; Radiation Dosage ; Radiometry/instrumentation ; Radiometry/methods
Language	English
Publishing date	2016-12
Publishing country	England
Document type	Journal Article
ZDB-ID	225912-6
ISSN	1742-3406 ; 0144-8420
ISSN (online)	1742-3406
ISSN	0144-8420
DOI	10.1093/rpd/ncv504
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Article ; Online: Search for Magnetic Monopoles with the MoEDAL Forward Trapping Detector in 13 TeV Proton-Proton Collisions at the LHC.

Acharya, B / Alexandre, J / Baines, S / Benes, P / Bergmann, B / Bernabéu, J / Branzas, H / Campbell, M / Caramete, L / Cecchini, S / de Montigny, M / De Roeck, A / Ellis, J R / Fairbairn, M / Felea, D / Flores, J / Frank, M / Frekers, D / Garcia, C /

Hirt, A M / Janecek, J / Kalliokoski, M / Katre, A / Kim, D-W / Kinoshita, K / Korzenev, A / Lacarrère, D H / Lee, S C / Leroy, C / Lionti, A / Mamuzic, J / Margiotta, A / Mauri, N / Mavromatos, N E / Mermod, P / Mitsou, V A / Orava, R / Parker, B / Pasqualini, L / Patrizii, L / Păvălaş, G E / Pinfold, J L / Popa, V / Pozzato, M / Pospisil, S / Rajantie, A / Ruiz de Austri, R / Sahnoun, Z / Sakellariadou, M / Sarkar, S / Semenoff, G / Shaa, A / Sirri, G / Sliwa, K / Soluk, R / Spurio, M / Srivastava, Y N / Suk, M / Swain, J / Tenti, M / Togo, V / Tuszyński, J A / Vento, V / Vives, O / Vykydal, Z / Whyntie, T / Widom, A / Willems, G / Yoon, J H / Zgura, I S

Physical review letters

2017 Volume 118, Issue 6, Page(s) 61801

Abstract: MoEDAL is designed to identify new physics in the form of long-lived highly ionizing particles produced in high-energy LHC collisions. Its arrays of plastic nuclear-track detectors and aluminium trapping volumes provide two independent passive detection ... ...

Abstract	MoEDAL is designed to identify new physics in the form of long-lived highly ionizing particles produced in high-energy LHC collisions. Its arrays of plastic nuclear-track detectors and aluminium trapping volumes provide two independent passive detection techniques. We present here the results of a first search for magnetic monopole production in 13 TeV proton-proton collisions using the trapping technique, extending a previous publication with 8 TeV data during LHC Run 1. A total of 222 kg of MoEDAL trapping detector samples was exposed in the forward region and analyzed by searching for induced persistent currents after passage through a superconducting magnetometer. Magnetic charges exceeding half the Dirac charge are excluded in all samples and limits are placed for the first time on the production of magnetic monopoles in 13 TeV pp collisions. The search probes mass ranges previously inaccessible to collider experiments for up to five times the Dirac charge.
Language	English
Publishing date	2017-02-10
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.118.061801
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Article ; Online: Magnetic Monopole Search with the Full MoEDAL Trapping Detector in 13 TeV pp Collisions Interpreted in Photon-Fusion and Drell-Yan Production.

Acharya, B / Alexandre, J / Baines, S / Benes, P / Bergmann, B / Bernabéu, J / Bevan, A / Branzas, H / Campbell, M / Cecchini, S / Cho, Y M / de Montigny, M / De Roeck, A / Ellis, J R / El Sawy, M / Fairbairn, M / Felea, D / Frank, M / Hays, J /

Hirt, A M / Janecek, J / Kim, D-W / Korzenev, A / Lacarrère, D H / Lee, S C / Leroy, C / Levi, G / Lionti, A / Mamuzic, J / Margiotta, A / Mauri, N / Mavromatos, N E / Mermod, P / Mieskolainen, M / Millward, L / Mitsou, V A / Orava, R / Ostrovskiy, I / Papavassiliou, J / Parker, B / Patrizii, L / Păvălaş, G E / Pinfold, J L / Popa, V / Pozzato, M / Pospisil, S / Rajantie, A / Ruiz de Austri, R / Sahnoun, Z / Sakellariadou, M / Santra, A / Sarkar, S / Semenoff, G / Shaa, A / Sirri, G / Sliwa, K / Soluk, R / Spurio, M / Staelens, M / Suk, M / Tenti, M / Togo, V / Tuszyński, J A / Vento, V / Vives, O / Vykydal, Z / Wall, A / Zgura, I S

Physical review letters

2015 Volume 123, Issue 2, Page(s) 21802

Abstract: MoEDAL is designed to identify new physics in the form of stable or pseudostable highly ionizing particles produced in high-energy Large Hadron Collider (LHC) collisions. Here we update our previous search for magnetic monopoles in Run 2 using the full ... ...

Abstract	MoEDAL is designed to identify new physics in the form of stable or pseudostable highly ionizing particles produced in high-energy Large Hadron Collider (LHC) collisions. Here we update our previous search for magnetic monopoles in Run 2 using the full trapping detector with almost four times more material and almost twice more integrated luminosity. For the first time at the LHC, the data were interpreted in terms of photon-fusion monopole direct production in addition to the Drell-Yan-like mechanism. The MoEDAL trapping detector, consisting of 794 kg of aluminum samples installed in the forward and lateral regions, was exposed to 4.0 fb^{-1} of 13 TeV proton-proton collisions at the LHCb interaction point and analyzed by searching for induced persistent currents after passage through a superconducting magnetometer. Magnetic charges equal to or above the Dirac charge are excluded in all samples. Monopole spins 0, ½, and 1 are considered and both velocity-independent and-dependent couplings are assumed. This search provides the best current laboratory constraints for monopoles with magnetic charges ranging from two to five times the Dirac charge.
Language	English
Publishing date	2015-09-30
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.123.021802
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