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Measurement and simulations of high-energy neutrons through a various thickness of concrete and steel shields using activation detectors at CHARM and CSBF
/ Nakao, Noriaki (Tokyo Inst. Tech.) ; Sanami, Toshiya (KEK, Tsukuba) ; Kajimoto, Tsuyoshi (Hiroshima U.) ; Yashima, Hiroshi (Kyoto Sangyo U.) ; Froeschl, Robert (CERN) ; Bozzato, Davide (CERN) ; Iliopoulou, Elpida (CERN) ; Infantino, Angelo (CERN) ; Lee, Eunji (Kyushu U.) ; Oyama, Takahiro (KEK, Tsukuba) et al.
A shielding experiment using activation detectors was performed at the CERN High-energy AcceleRator Mixed-field (CHARM) facility and the CERN Shielding Benchmark Facility (CSBF). The protons (24 GeV/c) were bombarded into a 50-cm-thick copper target, and the released neutrons were transmitted through various shields located vertically upward from the target. [...]
2023 - 19 p.
- Published in : J. Nucl. Sci. Tech. 61 (2023) 429-447
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Measurement of neutron spectra for various thicknesses of concrete and steel shielding at 24-GeV/c proton beam facility using Bonner sphere spectrometer
/ Matsumoto, Tetsuro (AIST, Tsukuba) ; Masuda, Akihiko (AIST, Tsukuba) ; Lee, Eunji (KEK, Tsukuba ; Kyushu U.) ; Sanami, Toshiya (KEK, Tsukuba) ; Oyama, Takahiro (KEK, Tsukuba) ; Kajimoto, Tsuyoshi (Hiroshima U.) ; Nakao, Noriaki (Shimizu, Tokyo) ; Yashima, Hiroshi (Kyoto U.) ; Nagaguro, Seiji (KEK, Tsukuba) ; Uwamino, Yoshitomo (Shimizu, Tokyo) et al.
Neutron energy spectra down to thermal energy were measured using a Bonner sphere spectrometer (BSS) for various thicknesses of concrete and steel shielding at the CERN/CHARM facility, where high-energy neutrons were produced by 24-GeV/c protons incident on a thick copper target. The thicknesses of the concrete and steel shielding blocks ranged from 40 cm to 200 cm and from 20 cm to 80 cm, respectively. [...]
2024 - 13 p.
- Published in : J. Nucl. Sci. Tech. 61 (2024) 98-110
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Benchmark Experiments for Bulk and Maze Shielding Using Activation Detectors with 24-GeV/c Protons at CERN/CHARM
/ Nakao, Noriaki (Tokyo U. Marine Sci. Tech.) ; Sanami, Toshiya (KEK, Tsukuba) ; Kajimoto, Tsuyoshi (Hiroshima U.) ; Froeschl, Robert (CERN) ; Bozzato, Davide (CERN ; KIT, Karlsruhe) ; Iliopoulou, Elpida (CERN) ; Infantino, Angelo (CERN) ; Yashima, Hiroshi (Kyoto Sangyo U.) ; Lee, Eunji (KEK, Tsukuba ; Kyushu U., Fukuoka (main)) ; Oyama, Takahiro (KEK, Tsukuba) et al.
Measurements of high-energy neutrons through shield penetration and maze streaming were performed at the Conseil Européen pour la Recherche Nucléaire (CERN) High-energy Accelerator Mixed-Field (CHARM) facility. The protons of 24 GeV/c were injected onto a 50-cm-thick copper target and the released neutrons were transmitted through shields and a maze in the facility. [...]
2024 - 12 p.
- Published in : Nucl. Sci. Eng. 198 (2024) 336-347
Fulltext: PDF;
In : 14th International Conference on Radiation Shielding & 21st Topical Meeting of the Radiation Protection and Shielding Division, Seattle, WA, USA, 25 - 29 Sep 2022, pp.336-347
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4.
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Measurements and Monte Carlo simulations of high-energy neutron streaming through the access maze using activation detectors at 24 GeV/c proton beam facility of CERN/CHARM
/ Nakao, Noriaki (Shimizu, Tokyo) ; Kajimoto, Tsuyoshi (Hiroshima U. (main)) ; Sanami, Toshiya (KEK, Tsukuba) ; Froeschl, Robert (CERN) ; Iliopoulou, Elpida (CERN) ; Infantino, Angelo (CERN) ; Yashima, Hiroshi (Kyoto U. (main)) ; Oyama, Takahiro (KEK, Tsukuba) ; Nagaguro, Seiji (KEK, Tsukuba) ; Lee, Eunji (Kyushu U., Fukuoka (main) ; NCSU, Raleigh) et al.
A measurement of high-energy neutron streaming was performed through a maze at the CERN (Conseil Européen pour la Recherche Nucléaire) High-energy AcceleRator Mixed-field (CHARM) facility. The protons of 24 GeV/c were injected onto a 50-cm-thick copper target and the released neutrons were streamed through a maze with several corridor-legs horizontally designed with the shield walls in the facility. [...]
2021 - 9 p.
- Published in : J. Nucl. Sci. Tech. 58 (2021) 899-907
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Energy spectra of neutrons penetrating concrete and steel shielding blocks from 24 GeV/c protons incident on thick copper target
/ Lee, Eunji (Kyushu U.) ; Shigyo, Nobuhiro (Kyushu U.) ; Kajimoto, Tsuyoshi (Hiroshima U.) ; Sanami, Toshiya (KEK, Tsukuba ; Sokendai, Tsukuba) ; Nakao, Noriaki (Shimizu, Tokyo) ; Froeschl, Robert (CERN) ; Iliopoulou, Elpida (CERN) ; Infantino, Angelo (CERN) ; Roesler, Stefan (CERN) ; Brugger, Markus (CERN)
In this study, experimental measurements were performed on the spectra of neutrons which penetrate concrete and steel of various thicknesses values when a proton beam of 24 GeV/c was incident on a copper target at the CHARM facility in the East Hall of the CERN Proton Synchrotron (PS) The thicknesses of concrete and steel ranged up to 360 cm and 80 cm, respectively. To measure the neutron spectra, an NE213 scintillator was positioned on the top roof of the shielding structure as the neutron detector. [...]
2021 - 13 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 998 (2021) 165189
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6.
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Measurements of secondary-particle emissions from copper target bombarded with 24-GeV/c protons
/ Oyama, Takahiro (KEK, Tsukuba) ; Sanami, Toshiya (KEK, Tsukuba) ; Yashima, Hiroshi (Kyoto U., KURRI) ; Hagiwara, Masayuki (KEK, Tsukuba) ; Nakao, Noriaki (Shimizu, Tokyo) ; Infantino, Angelo (CERN) ; Iliopoulou, Elpida (CERN) ; Froeschl, Robert (CERN) ; Roesler, Stefan (CERN) ; Kajimoto, Tsuyoshi (Hiroshima U.) et al.
To devise an activation technique for characterizing mixed radiation fields, secondary particles from a copper target irradiated by 24 GeV/c protons were measured at the CERN High-energy AcceleRator Mixed field facility (CHARM). Activation detector sets consisting of aluminum, niobium, indium, and bismuth, were placed at 30 cm from the target at angles of 15° to 160° with respect to the beam axis. [...]
2021 - 10 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 990 (2021) 164977
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Classification of radiological objects at the exit of accelerators with a dose-rate constraint
/ Frosio, Thomas (CERN) ; Dumont, Gerald (CERN) ; Froeschl, Robert (CERN) ; Iliopoulou, Elpida (CERN) ; Magistris, Matteo (CERN) ; Menaa, Nabil (CERN) ; Roesler, Stefan (CERN) ; Theis, Chris (CERN) ; Vincke, Heinz (CERN) ; Vincke, Helmut (CERN)
Maintenance activities and operations of high-energy particle accelerators can lead to the collection of radioactive equipment as well as waste materials. In order to ensure their proper classification as radioactive or non-radioactive, one has to quantify the activities of radionuclides produced. [...]
2020 - 13 p.
- Published in : Appl. Radiat. Isot. 165 (2020) 109303
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Attenuation length of high energy neutrons through a thick concrete shield measured by activation detectors at CHARM
/ Nakao, Noriaki (Shimizu, Tokyo) ; Sanami, Toshiya (KEK, Tsukuba) ; Kajimoto, Tsuyoshi (Hiroshima U. (main)) ; Iliopoulou, Elpida (CERN) ; Froeschl, Robert (CERN) ; Brugger, Markus (CERN) ; Roesler, Stefan (CERN) ; Infantino, Angelo (CERN)
A deep-penetration shielding experiment was performed at the CERN High-energy AcceleRator Mixed-field (CHARM) facility. The protons (24 GeV/c) were injected into a 50-cm-thick copper target and the released neutrons were transmitted through a bulk concrete shield located vertically upward from the target, where they were measured with bismuth and aluminum activation detectors placed at various penetration distances in the shield. [...]
2020 - 13 p.
- Published in : J. Nucl. Sci. Tech. 57 (2020) 1022-1034
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10.
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Neutron energy spectrum measurement using an NE213 scintillator at CHARM
/ Kajimoto, Tsuyoshi (Hiroshima U. (main)) ; Sanami, Toshiya (KEK, Tsukuba) ; Nakao, Noriaki (Shimizu, Tokyo) ; Froeschl, Robert (CERN) ; Roesler, Stefan (CERN) ; Iliopoulou, Elpida (CERN ; Aristotle U., Thessaloniki) ; Infantino, Angelo (CERN) ; Brugger, Markus (CERN) ; Lee, Eunji (Kyushu U., Fukuoka (main)) ; Shigyo, Nobuhiro (Kyushu U., Fukuoka (main)) et al.
To establish a methodology for neutron spectrum measurement at the CERN High energy AcceleRator Mixed field facility (CHARM), neutron spectra were measured using an NE213 scintillator on top of the CHARM roof shielding where is the CERN Shielding Benchmark Facility (CSBF). The spectra were derived as fluences into the scintillator by the unfolding method using an iterative Bayesian algorithm. [...]
2018 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 429 (2018) 27-33
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