Role of activation analysis for radiation control in accelerator facilities

Masumoto, K.; Matsumura, Hiroshi; Bessho, Kotaro; Toyoda, Akihiro

doi:10.1007/s10967-008-0902-5

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Previous studies have reported major radionuclides in certain particle accelerator facilities [11][12][13][14][15][16][17][18][19][20][21][22]. Major longlived radionuclides include 3 H (T), 22 152 Eu for fast neutrons.…”

Section: Introductionmentioning

confidence: 99%

Radioactivation Analysis of Concrete Wall in OKTAVIAN Facility

Tamaki

Panuntun

UEDOI

et al. 2022

Plasma and Fusion Research

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A deuterium-tritium (DT) neutron generator in Osaka University with a continuous intense neutron source emitting 3 × 10 12 fusion neutrons per second has been in operation since 1981. However, radioactivation for the parts of the accelerator body is a serious issue. Hence, in this study, we investigated the radioactivation of the intense irradiation room containing the continuous intense neutron source. Core samples of the concrete wall were collected at various positions in the irradiation room and the radionuclides in them were determined by performing gamma-ray spectrometry. Major long-lived radionuclides found were 54 Mn, 60 Co, and 152 Eu. The radioactivity of 152 Eu may possibly be consistent with the result obtained using the simulation code. The radioactivities of 54 Mn and 60 Co were minimal compared with that of 152 Eu. The tritium amount in the core sample was measured employing a tritium sampling system and a liquid scintillation detector and was found to be considerably larger than the amount estimated using the simulation code. Tritium diffused from the titanium-tritium target was attached to the wall surface. However, most of it did not penetrate the concrete wall. These results reveal the radioactivity issue of fusion neutron generator facilities and are expected to aid in the maintenance of their operation.

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Section: Introductionmentioning

confidence: 99%

Radioactivation Analysis of Concrete Wall in OKTAVIAN Facility

Tamaki

Panuntun

UEDOI

et al. 2022

Plasma and Fusion Research

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“…In particular, long-lived nuclides such as 60 Co (half-life: 5.27 y [1]) and 152 Eu (half-life: 13.5 y [1]) must be treated for a prolonged time. Therefore, the site, type, and activity of radionuclides generated in the beamline and the building should be clarified properly at each facility before it is decommissioned [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Investigation into activation of accelerators at various synchrotron radiation facilities in Japan

Yoshida

Matsumura

Masumoto

et al. 2021

Journal of Nuclear Science and Technology

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To establish systematic guidelines for accelerator decommissioning, a large-scale activation survey was conducted at representative synchrotron radiation facilities in Japan. The neutron flux during accelerator operation was measured with various dosimeters. A Monte Carlo simulation was conducted for some facilities to verify the special neutron distribution and their spectra. Beam loss points, reflected as high-dose-rate areas, were identified by a wholebeamline survey with a survey meter, and the generated radionuclides and their activity were determined with a lanthanum bromide (LaBr 3 ) scintillation spectrometer. In all facilities, the activation level was quite low. Whole-beamline tunnels made of concrete were not activated, and no radionuclides were detected except for natural nuclides. In addition, almost all beamline components were either not or minimally activated. Although the acceleration energy is very high for radiation synchrotron facilities, the generation of radioactive waste would be very low.

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“…However, the activated areas and nonactivated areas should be segregated properly at each facility during decommissioning. The generated nuclides differ between the beamline and building due to differences in the activation mechanisms [1][2][3] . Thermal neutrons generated during the accelerator operation influence concrete activation the most, whereas in the case of beamline activation, the effects of primary particles must also be considered.…”

Section: Introductionmentioning

confidence: 99%

“…The increase in the dose rate at the beamline was transient and supposed to be attributed to the short-lived nuclides.3-4. Beam loss estimationFirst, the recent operation history was investigated to reveal the influence of previous operations on the present activities of 52 Mn and 56 Co. A total of ten proton beam experiments were total operation time was 122 h. Considering the above, the residual activity due to previous operations, "A", was estimated from the equation(1).…”

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confidence: 99%

Survey Methodology for the Activation of Beamline Components in an Electrostatic Proton Accelerator

Yoshida

Matsumura

Nakamura

et al. 2021

Radiat. Saf. Manage.

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To establish a systematic guideline for accelerator decommissioning, as a case study, beamline activation of 12 MeV-proton electrostatic accelerator was investigated employing a survey meter and g-ray spectrometers. Beam loss points where reflected as high dose-rate area were identified, and generated nuclides and their activities were determined. Almost beamline components are made from stainless steel and 52 Mn and 56 Co were detected as principal induced activities. It was found that the 56 Co activity significantly contribute to the dose rate value denoted on the survey meter. From the beam operation history and the monitor currents of Faraday-cups, we revealed the beam loss on a certain point significantly reflects the 52 Mn activity on there. Induced activities of 52 Mn and 56 Co on the certain point of the beamline could be reproduced by the contact dose-rate on that point.

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Role of activation analysis for radiation control in accelerator facilities

Cited by 9 publications

References 7 publications

Radioactivation Analysis of Concrete Wall in OKTAVIAN Facility

Radioactivation Analysis of Concrete Wall in OKTAVIAN Facility

Investigation into activation of accelerators at various synchrotron radiation facilities in Japan

Survey Methodology for the Activation of Beamline Components in an Electrostatic Proton Accelerator

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