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Journal Articles

Validation of crystal surface scattering method for downsizing accelerator mass spectrometry

Jinno, Satoshi; Matsubara, Akihiro*; Fujita, Natsuko; Kimura, Kenji

Nuclear Instruments and Methods in Physics Research B, 557, p.165545_1 - 165545_4, 2024/12

 Times Cited Count:0 Percentile:0.00(Instruments & Instrumentation)

This study introduces the development of a downsized Accelerator Mass Spectrometry (AMS) system aiming to enhance accessibility and cost-effectiveness in radiocarbon analysis. The "crystal surface stripper method" is introduced as a solution to challenges in AMS downsizing, demonstrating effective ion detection with a smaller angular spread compared to conventional gas stripper methods. The experimental results provide insights into charge conversion capabilities, scattering angle broadening, and energy loss associated with surface scattering.

Journal Articles

The Impact of climate on relief in the northern Japanese Alps within the past 1 Myr; The case of the Tateyama mountains

Bartz, M.*; King, G. E.*; Bernard, M.*; Herman, F.*; Wen, X.*; Sueoka, Shigeru; Tsukamoto, Sumiko*; Braun, J.*; Tagami, Takahiro*

Earth and Planetary Science Letters, 644, p.118830_1 - 118830_11, 2024/10

 Times Cited Count:0 Percentile:0.00(Geochemistry & Geophysics)

Journal Articles

None

Matsubara, Ryuta*; Hamamoto, Takafumi*; Ishidera, Takamitsu

NUMO-TR-24-03, p.65 - 70, 2024/10

no abstracts in English

Journal Articles

None

Matsubara, Ryuta*; Ueno, Fuga*; Iwata, Hajime; Inagaki, Yaohiro*; Okubo, Takahiro*

NUMO-TR-24-03, p.55 - 61, 2024/10

no abstracts in English

JAEA Reports

Survey of asbestos in piping insulation in specified facilities of JMTR

Kuwabara, Ryota; Yanai, Tomohiro; Kagi, Takumi; Tanimoto, Masataka

JAEA-Review 2024-036, 43 Pages, 2024/09

JAEA-Review-2024-036.pdf:4.18MB

The Japan Materials Testing Reactor (JMTR) has a main facility and a specified facility, and construction began in 1967. Therefore, there is concern that asbestos was used in various parts of the facility since it was built before asbestos was regulated. Asbestos has very good properties such as durability, heat resistance, chemical resistance, and electrical insulation, and there is a high probability that asbestos was contained in components and building materials at that time. Therefore, the investigation was focused on specified facilities outside the controlled areas, and an investigation was conducted on heat insulators wrapped around piping installed in the facilities. Of the various systems of piping installed in the facilities, we investigated the presence or absence of asbestos in the heat insulators, especially in piping that had been installed for a long period of time. Inhalation of asbestos can cause diseases such as lung cancer and mesothelioma, so when buildings are demolished or renovated, there is a legal requirement to conduct a preliminary investigation to determine the presence of asbestos. Therefore, it is important to understand the status of asbestos usage within the facility in advance, and we believe that it can also be applied to the formulation of plans for the dismantling and removal of equipment and devices during future decommissioning. As a result of the investigations, asbestos was found in the thermal insulation, especially in the elbow where the piping is bent. The results of these investigations are presented in this report.

Journal Articles

Role of micropores within minerals in retardation of mass transfer by matrix diffusion and sorption in granitic rock

Yuguchi, Takashi*; Sasao, Eiji; Hibara, Ryoko*; Murakami, Hiroaki; Ozaki, Yusuke

Heliyon (Internet), 10(17), p.e37417_1 - e37417_17, 2024/09

 Times Cited Count:0 Percentile:0.00(Multidisciplinary Sciences)

Understanding the mass transfer characteristics of matrix diffusion and sorption is important in geological disposal of high-level radioactive waste in crystalline rock. We present a comparative discussion of the effective diffusion coefficient (De), porosity, and petrological data for rock samples collected from the Toki Granite in central Japan, to evaluate the role of micropores within minerals in retardation by matrix diffusion and sorption in granitic rocks. De was derived from the through-diffusion experiments. Petrological data consist of the fracture frequency, the extent of hydrothermal alteration in the minerals, the micropore volume in the minerals, and the three-dimensional modal mineralogy for the target rock samples. The relationship between the De, porosity, and petrological data has the following implications: 1) Micropores act as storage pores that contribute to retardation; 2) Once the uranine, cations, and anion penetrate the micropores in the minerals through matrix diffusion, the cations are sorbed on the micropore surfaces; 3) Regions with a high fracture frequency are associated with not only active advection-dispersion through fractures, but also retardation due to matrix diffusion and sorption.

Journal Articles

A Cause and the measures that the expansion joint of the steam plumbing for Reprocessing Plants damaged

Nishino, Shohei; Nishida, Tetsuro; Kawasaki, Ichio; Motohashi, Masahiro; Kambara, Takashi*; Suzuki, Takaichi*; Kinoshita, Masato*

Nihon Hozen Gakkai Dai-20-Kai Gakujutsu Koenkai Yoshishu, p.14 - 21, 2024/08

Steam is used to a process and air conditioning in Nuclear fuel Cycle engineering Laboratories (NCL). The steam is used mainly in Reprocessing Plant, and it is supplied by two steam plumbing. A leak occurred from the steam plumbing in November, 2022. As a result of cause investigation, I estimated that it had leaked by a water hammer caused for the trouble of the steam trap.

Journal Articles

Reevaluation of structures in $$^{70}$$Se from combined conversion-electron and $$gamma$$-ray spectroscopy

Smallcombe, J.; Garnsworthy, A. B.*; Korten, W.*; Singh, P.*; Muir, D.*; Pr$'o$chniak, L.*; Ali, F. A.*; Andreoiu, C.*; Ansari, S.*; Ball, G. C.*; et al.

Physical Review C, 110(2), p.024318_1 - 024318_16, 2024/08

 Times Cited Count:0 Percentile:0.00(Physics, Nuclear)

Journal Articles

Evaluation of the effects of bentonite colloids

Matsubara, Ryuta*; Hamamoto, Takafumi*; Ishidera, Takamitsu

NUMO-TR-24-01, p.91 - 94, 2024/05

no abstracts in English

Journal Articles

Expansion of the evidence for reducing glass dissolution rate due to glass alteration layer

Matsubara, Ryuta*; Takubo, Yusaku*; Iwata, Hajime; Inagaki, Yaohiro*; Okubo, Takahiro*

NUMO-TR-24-01, p.104 - 108, 2024/05

no abstracts in English

Journal Articles

Generality assessment of a model considering heterogeneous cancer cells for predicting tumor control probability for stereotactic body radiation therapy against non-small cell lung cancer

Saga, Ryo*; Matsuya, Yusuke; Obara, Hideki*; Komai, Fumio*; Yoshino, Hironori*; Aoki, Masahiko*; Hosokawa, Yoichiro*

Advances in Radiation Oncology (Internet), 9(4), p.101437_1 - 101437_5, 2024/04

The curative effects after radiotherapy are evaluated by the index of tumor control probability (TCP), and the treatment regimen has been determined empirically based on clinical experiences. In recent years, in order to determine TCP for any treatment regimens based on cell experiments, it is necessary to consider the existence of radioresistant cancer stem cells, which are included in tumors at from a few to several tens of percent. Our previous study has proposed an integrated microdosimetric-kinetic (IMK) model that explicitly considers cancer stem cells, and successfully reproduced cancer cell death obtained from cell experiments and clinical TCP. However, the verification so far has been limited to comparison with the clinical data of Hirosaki University Hospital, and comparative verification with clinical data of other facilities has not been performed. In this study, we focused on the stereotactic radiotherapy against non-small cell lung cancer that prescribes a large dose at once, and compared the public data collected by meta-analysis with the IMK model. As a result, it was found that the IMK model considering cancer stem cells well reproduced the clinical TCP regardless of the observed facility type. This work would contribute to the development of technology for predicting curative effects of radiotherapy with high precision.

Journal Articles

Comparative study of radiation mapping technologies for nuclear disaster assessment

Ochi, Kotaro; Barker, E.*; Nakama, Shigeo; Gleizes, M.*; Manach, E.*; Vincent, F.*; Sanada, Yukihisa

Journal of Disaster Research, 19(2), p.429 - 445, 2024/04

There are no clear criteria for standardizing mapping techniques for ambient dose equivalent rate (air dose rate) distributions in different countries. Thus, in this study, manborne, carborne, and airborne radiation surveys were conducted jointly by the Japan Atomic Energy Agency and the French Institute for Radiological Protection and Nuclear Safety in the vicinity of the Fukushima Daiichi Nuclear Power Station to confirm the effectiveness of each organization's monitoring methods. For example, in the manborne survey, the discrepancy between the air dose rates measured by the two institutions was observed depending on whether or not the contribution from radionuclides with different gamma-ray energies was considered when converting the count rates obtained by the detectors to air dose rates. As in this study, comparing mapping techniques among various countries and providing feedback to each other should help to improve the accuracy of zoning scenarios after nuclear accidents.

Journal Articles

High sensitivity of a future search for effects of $$P$$-odd/$$T$$-odd interactions on the 0.75 eV $$p$$-wave resonance in $$overrightarrow{n}$$+$$^{139}overrightarrow{textrm{La}}$$ forward transmission determined using a pulsed neutron beam

Nakabe, Rintaro*; Auton, C. J.*; Endo, Shunsuke; Fujioka, Hiroyuki*; Gudkov, V.*; Hirota, Katsuya*; Ide, Ikuo*; Ino, Takashi*; Ishikado, Motoyuki*; Kambara, Wataru*; et al.

Physical Review C, 109(4), p.L041602_1 - L041602_4, 2024/04

 Times Cited Count:0 Percentile:0.00(Physics, Nuclear)

Journal Articles

Spin dependence in the $$p$$-wave resonance of $$^{139}$$$overrightarrow{textrm{La}}$+$overrightarrow{n}$

Okudaira, Takuya*; Nakabe, Rintaro*; Auton, C. J.*; Endo, Shunsuke; Fujioka, Hiroyuki*; Gudkov, V.*; Ide, Ikuo*; Ino, Takashi*; Ishikado, Motoyuki*; Kambara, Wataru*; et al.

Physical Review C, 109(4), p.044606_1 - 044606_9, 2024/04

 Times Cited Count:0 Percentile:0.00(Physics, Nuclear)

Journal Articles

Observation of high-pressure polymorphs in bulk silicon formed at relativistic laser intensities

Rapp, L.*; Matsuoka, Takeshi*; Firestein, K. L.*; Sagae, Daisuke*; Habara, Hideaki*; Mukai, Keiichiro*; Tanaka, Kazuo*; Gamaly, E. G.*; Kodama, Ryosuke*; Seto, Yusuke*; et al.

Physical Review Research (Internet), 6(2), p.023101_1 - 023101_18, 2024/04

It is generally known that irradiating a solid surface with a laser pulse of ultra-relativistic intensity generates a plasma on the surface, which in turn creates an ultrahigh pressure inside. In this study, the crystal structure analysis of high-pressure phases generated inside silicon single-crystals irradiated by this laser was performed using the diffraction system at the Stress and Imaging apparatus of BL22XU, which is a JAEA-BL. The results obtained confirm the existence of high-pressure phases that silicon is said to possess: body-centered, rhombohedral, hexagonal, and tetragonal phases in the interior. We can get the results that the crystal structure of silicon polymorphs of being include body-centered, rhombohedral, hexagonal-diamond, tetragonal exists. In the future, we will accumulate data and apply them to control the internal structure, strength, and functionality of materials.

Journal Articles

Present status of the JAEA-AMS-TONO (2022FY)

Fujita, Natsuko; Miyake, Masayasu; Matsubara, Akihiro*; Ishii, Masahiro*; Watanabe, Takahiro; Jinno, Satoshi; Nishio, Tomohiro*; Ogawa, Yumi; Kimura, Kenji; Shimada, Akiomi; et al.

Dai-35-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.17 - 19, 2024/03

The JAEA-AMS-TONO facility at the Tono Geoscience Center, JAEA has three accelerator mass spectrometers. We report the present status of the JAEA-AMS-TONO.

Journal Articles

Onset of collectivity for argon isotopes close to $$N=32$$

Linh, B. D.*; Corsi, A.*; Gillibert, A.*; Obertelli, A.*; Doornenbal, P.*; Barbieri, C.*; Duguet, T.*; G$'o$mez-Ramos, M.*; Holt, J. D.*; Hu, B. S.*; et al.

Physical Review C, 109(3), p.034312_1 - 034312_15, 2024/03

 Times Cited Count:1 Percentile:72.68(Physics, Nuclear)

no abstracts in English

JAEA Reports

Contribution to risk reduction in decommissioning works by the elucidation of basic property of radioactive microparticles (Contract Research); FY2020 Nuclear Energy Science & Technology and Human Resource Development Project

Collaborative Laboratories for Advanced Decommissioning Science; Ibaraki University*

JAEA-Review 2023-021, 112 Pages, 2024/02

JAEA-Review-2023-021.pdf:7.1MB

The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2020. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2018, this report summarizes the research results of the "Contribution to Risk Reduction in Decommissioning Works by the Elucidation of Basic Property of Radioactive Microparticles" conducted from FY2018 to FY2021 (this contract was extended to FY2021). The present study aims to understand the basic properties (size, chemical composition, isotopic composition - including concentration of $$alpha$$-emitters, electrostatic properties, and optical properties, etc.) of fine particles composed of silicate with insoluble properties which contain regions of highly concentrated radioactive cesium (Cs) released to the environment by the accident at the Fukushima Daiichi Nuclear Power Station of TEPCO in 2011 March.

Journal Articles

Development of a downsized AMS system at JAEA-AMS-TONO

Fujita, Natsuko; Matsubara, Akihiro*; Jinno, Satoshi; Kimura, Kenji

Hoshasen (Internet), 48(4), p.137 - 138, 2024/02

We have been developing a downsized AMS with a size of about 2 m $$times$$ 2 m. This AMS is developed to demonstrate a new method of separating same-mass molecules, which are interfering nuclides during AMS measurement of carbon-14, using ion channeling.

Journal Articles

Neutronics-thermal-hydraulics-coupled transient analysis for reactor power change in an inclined offshore floating boiling water reactor

Fukuda, Kodai; Obara, Toru*; Suyama, Kenya

Nuclear Technology, 11 Pages, 2024/00

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

1680 (Records 1-20 displayed on this page)