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Journal Articles

A Study of the $$phi N$$ correlation function

Abreu, L. M.*; Gubler, P.; Khemchandani, K. P.*; Mart$'i$nez Torres, A.*; Hosaka, Atsushi

Physics Letters B, 860, p.139175_1 - 139175_7, 2025/01

 Times Cited Count:0

Journal Articles

LET-based approximation of the microdosimetric kinetic model for proton radiotherapy

Parisi, A.*; Furutani, K. M.*; Sato, Tatsuhiko; Beltran, C. J.*

Medical Physics, 51(10), p.7589 - 7605, 2024/10

 Times Cited Count:0 Percentile:0.00(Radiology, Nuclear Medicine & Medical Imaging)

In this study, we have developed an approximate MKM (microdosimetric kinetic model) based on LET (dose-averaged linear energy transfer) to address the challenges of biological relative effectiveness (RBE) models for proton therapy. This is an attempt to apply the mechanism-based approach used in carbon ion therapy to proton beams. This LET-based MKM establishes a correlation between dose-averaged LET and microbiological indices and successfully models survival rates for multiple cell lines. This has resulted in a mathematical description of RBE based on physical quantities that can be readily used in proton therapy planning systems.

Journal Articles

Comparative evaluation of two analytical functions for the microdosimetry of ions from $$^{1}$$H to $$^{238}$$U

Parisi, A.*; Furutani, K. M.*; Sato, Tatsuhiko; Beltran, C. J.*

Quantum Beam Science (Internet), 8(3), p.18_1 - 18_16, 2024/09

Journal Articles

Circular polarization measurement for individual gamma rays in capture reactions with intense pulsed neutrons

Endo, Shunsuke; Abe, Ryota*; Fujioka, Hiroyuki*; Ino, Takashi*; Iwamoto, Osamu; Iwamoto, Nobuyuki; Kawamura, Shiori*; Kimura, Atsushi; Kitaguchi, Masaaki*; Kobayashi, Ryuju*; et al.

European Physical Journal A, 60(8), p.166_1 - 166_10, 2024/08

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

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

Study on eutectic melting behavior of control rod materials in severe accidents of sodium-cooled fast reactors, 4; Analyzing Eutectic Melting and Relocation Dynamics in B$$_{4}$$C-stainless steel using the Moving Particle Semi-Implicit (MPS) Method

Ahmed, Z.*; Wu, S.*; Pellegrini, M.*; Okamoto, Koji*; Sharma, A.*; Yamano, Hidemasa

Proceedings of 14th International Topical Meeting on Nuclear Reactor Thermal-Hydraulics, Operation, and Safety (NTHOS-14) (Internet), 14 Pages, 2024/08

The analysis show that once eutectic reaction occurs, the boron diffuses into the stainless steel (SS) wall. Melting initiates at the B$$_{4}$$C and SS interface, with melt flow following SS cladding penetration. Also, we observed that as temperature rises, a proportional increase in the boron concentration within the melt. The updated MPS method indicated a computational capability of the eutectic reaction model used to effectively analyze control rod eutectic reactions, simulating severe accidents, and its subsequent relocation to understand the effect of B$$_{4}$$C ingress into the core.

Journal Articles

Study on eutectic melting behavior of control rod materials in severe accidents of sodium-cooled fast reactors, 1; Project overview and progress until 2022

Yamano, Hidemasa; Takai, Toshihide; Emura, Yuki; Fukuyama, Hiroyuki*; Higashi, Hideo*; Nishi, Tsuyoshi*; Morita, Koji*; Nakamura, Kinya*; Ahmed, Z.*; Pellegrini, M.*

Proceedings of 14th International Topical Meeting on Nuclear Reactor Thermal-Hydraulics, Operation, and Safety (NTHOS-14) (Internet), 12 Pages, 2024/08

This paper describes the project overview and progress of experimental and analytical studies conducted until 2022. A specific result in this paper is to obtain first experimental data of B$$_{4}$$C-SS eutectic freezing.

Journal Articles

Coulomb spike model of radiation damage in wide band-gap insulators

Costantini, J.-M.*; Ogawa, Tatsuhiko

Quantum Beam Science (Internet), 8(3), p.20_1 - 20_16, 2024/08

A novel Coulomb spike concept is applied to the radiation damage induced in LiF and SiO$$_{2}$$ with about the same mass density ($$sim$$2.65 g cm$$^{-3}$$) by $$_{28}^{60}$$Ni and $$_{36}^{84}$$Kr ions of 1.0-MeV/u energy for about the same electronic energy loss (10 MeV/um). The distribution of ionizations and electrostatic energy gained in the electric field by the ionized atoms is computed with the PHITS code for both targets. Further, the atomic collision cascades induced by these low energy hot ions of about 500 eV are simulated with the SRIM2013 code. It is found that melting is reached in a small volume for SiO$$_{2}$$ due to the energy deposition in the subthreshold events of nuclear collisions induced by the Si and O ions. For LiF, the phonon contribution to the stopping power of the lighter Li and F ions is not sufficient to induce melting, even though the melting temperature is lower than for SiO$$_{2}$$. The formation of amorphous domains in SiO$$_{2}$$ is likely after fast quenching of the small molten pockets, whereas only point defects may be formed in LiF.

Journal Articles

Study on the difference between B$$_{4}$$C powder and B$$_{4}$$C pellet regarding the eutectic reaction with stainless steel

Hong, Z.*; Ahmed, Z.*; Pellegrini, M.*; Yamano, Hidemasa; Erkan, N.*; Sharma, A. K.*; Okamoto, Koji*

Progress in Nuclear Energy, 171, p.105160_1 - 105160_13, 2024/06

 Times Cited Count:3 Percentile:95.99(Nuclear Science & Technology)

In this study, it is found that the eutectic reaction between B$$_{4}$$C powder and stainless steel (SS) is considerably more rapid than that between the B$$_{4}$$C pellet and SS. The derived reaction rate constant values for powder and pellet cases are consistently based on the reference values. Also, a composition analysis using SEM/EDS was conducted for the detailed microstructures of the powder and pellet samples. In the powder case, only one thick layer is found as the reaction layer consisting of (Fe, Cr)B precipitate, including B$$_{4}$$C powder. In the pellet case, two layers are found in the reaction layer.

Journal Articles

Eutectic melting and relocation behavior of B$$_{4}$$C pellet-stainless steel under radiative heating

Ahmed, Z.*; Sharma, A. K.*; Pellegrini, M.*; Yamano, Hidemasa; Kano, Sho*; Okamoto, Koji*

Ceramics International, 50(10), p.17665 - 17680, 2024/05

 Times Cited Count:2 Percentile:77.98(Materials Science, Ceramics)

In this study, we identified two distinct failure mechanisms: the separation of stainless steel from the B$$_{4}$$C pellet, resulting in the formation of a later melting drop, and the fracture of the B$$_{4}$$C pellet into multiple pieces, possibly due to thermal stress. The visualization technique and thermal interfacial resistance analysis precisely captured the eutectic temperature.

Journal Articles

A Systematic approach for the adequacy analysis of a set of experimental databases; Application in the framework of the ATRIUM activity

Baccou, J.*; Glantz, T.*; Ghione, A.*; Sargentini, L.*; Fillion, P.*; Damblin, G.*; Sueur, R.*; Iooss, B.*; Fang, J.*; Liu, J.*; et al.

Nuclear Engineering and Design, 421, p.113035_1 - 113035_16, 2024/05

 Times Cited Count:4 Percentile:95.99(Nuclear Science & Technology)

Journal Articles

Accelerator mass spectrometry of $$^{90}$$Sr in environmental samples utilizing laser photo-detachment

Honda, Maki; Martschini, M.*; Marchhart, O.*; Steier, P.*; Golser, R.*; Sakaguchi, Aya*

Hoshasen (Internet), 48(4), p.130 - 136, 2024/02

Strontium-90 ($$^{90}$$Sr, 28.9 years) is a key fission product nuclide in internal dose assessment because it accumulates in bones and teeth in the body, causing health problems. Therefore, it is essential to know the distribution of $$^{90}$$Sr in the environment and its temporal variation ($$^{90}$$Sr enrichment in biota), which requires efficient analysis of many environmental samples. An analysis of environmental samples with known $$^{90}$$Sr concentrations conducted with the 3 MV AMS facility (VERA: Vienna Environmental Research Accelerator) at the University of Vienna, Austria, towards the practical application of $$^{90}$$Sr AMS, the results of which are detailed in this paper. In this study, the validity of the AMS method was demonstrated by analyzing environmental samples with known $$^{90}$$Sr concentrations (IAEA-447, IAEA-A-12, and IAEA-TEL-2015-03 sample 5: 1 dry-g each). The chemical separation developed in this study takes approximately two days and is a more straightforward procedure than conventional $$beta$$-ray detection methods. The $$^{90}$$Sr measurements were conducted on the AMS system combined with the Ion Laser InterAction Mass Spectrometry (ILIAMS) system. The AMS method achieved a limit of detection $$<$$0.1 mBq ($$<$$ 1.3$$times$$10$$^{5}$$ atoms) for $$^{90}$$Sr, which is 1/30th of typical $$beta$$-ray detection. As a result of the lower detection limit, the AMS method allows $$^{90}$$Sr quantification with smaller sample volumes. For example, a Japanese freshwater sample with a $$^{90}$$Sr concentration of 4 mBq/L requires a sample volume of 5 liter

Journal Articles

Development of DynamicMC for PHITS Monte Carlo package

Watabe, Hiroshi*; Sato, Tatsuhiko; Yu, K. N.*; Zivkovic, M.*; Krstic, D.*; Nikezic, D.*; Kim, K. M.*; Yamaya, Taiga*; Kawachi, Naoki*; Tanaka, Hiroki*; et al.

Radiation Protection Dosimetry, 200(2), p.130 - 142, 2024/02

 Times Cited Count:1 Percentile:34.39(Environmental Sciences)

Previously, we have developed DynamicMC for modelling relative movement of ORNL phantom in a radiation field for MCNP. Using this software, 3-dimensional dose distributions in a phantom irradiated by a certain mono-energetic source can be deduced through its graphical user interface (GUI). In this study, we extended DynamicMC to be used in combination with the PHITS by providing it with a higher flexibility for dynamic movement for a less sophisticated anthropomorphic phantom. We anticipate that the present work and the developed open-source tools will be in the interest of nuclear radiation physics community for research and teaching purposes.

Journal Articles

Coverage-dependent desorption kinetics of water on a well-ordered alumina thin film surface

Koshida, Hiroyuki*; Wilde, M.*; Fukutani, Katsuyuki

Journal of Chemical Physics, 160(3), p.034703_1 - 034703_9, 2024/01

 Times Cited Count:0 Percentile:0.00(Chemistry, Physical)

Journal Articles

Visualization experiments of radiation heating on the eutectic reaction between B$$_{4}$$C-SS and its relocation behavior

Ahmed, Z.*; Sharma, A. K.*; Pellegrini, M.*; Yamano, Hidemasa; Okamoto, Koji*

Proceedings of Saudi International Conference On Nuclear Power Engineering (SCOPE2023) (Internet), 8 Pages, 2023/11

In this study, the eutectic behavior and subsequent melt structure of boron migration are observed by a quantitative and high-resolution visualization method using radiative heating. Experiments were conducted using B4C pellet and powder within SS tubes, replicating the actual control rod design in the temperature range of 1150$$^{circ}$$C to 1372$$^{circ}$$C to study long-duration melting and relocation behavior. The visualization technique accurately identified the time of eutectic melting onset and the related temperature, pointing out different values for the pellet and the powder cases.

Journal Articles

PANDORA Project for the study of photonuclear reactions below $$A=60$$

Tamii, Atsushi*; Pellegri, L.*; S$"o$derstr$"o$m, P.-A.*; Allard, D.*; Goriely, S.*; Inakura, Tsunenori*; Khan, E.*; Kido, Eiji*; Kimura, Masaaki*; Litvinova, E.*; et al.

European Physical Journal A, 59(9), p.208_1 - 208_21, 2023/09

 Times Cited Count:3 Percentile:69.58(Physics, Nuclear)

no abstracts in English

Journal Articles

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors; Project overview and progress until JFY2022

Yamano, Hidemasa; Takai, Toshihide; Emura, Yuki; Fukuyama, Hiroyuki*; Nishi, Tsuyoshi*; Morita, Koji*; Nakamura, Kinya*; Pellegrini, M.*

Nihon Kikai Gakkai 2023-Nendo Nenji Taikai Koen Rombunshu (Internet), 5 Pages, 2023/09

A research project has been conducting thermophysical property measurement of a eutectic melt, eutectic melting reaction and relocation experiments, eutectic reaction mechanism investigation, and physical model development on the eutectic melting reaction for reactor application analysis in order to simulate the eutectic melting reaction and relocation behavior of boron carbide as a control rod material and stainless steel during a core disruptive accident in an advanced sodium-cooled fast reactor designed in Japan. This paper describes the project overview and progress until JFY2022.

Journal Articles

Main outputs from the OECD/NEA ARC-F Project

Maruyama, Yu; Sugiyama, Tomoyuki*; Shimada, Asako; Lind, T.*; Bentaib, A.*; Sogalla, M.*; Pellegrini, M.*; Albright, L.*; Clayton, D.*

Proceedings of 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-20) (Internet), p.4782 - 4795, 2023/08

Journal Articles

The Development of a Multiphysics Coupled Solver for Studying the Effect of Dynamic Heterogeneous Configuration on Particulate Debris Bed Criticality and Cooling Characteristics

Li, C.-Y.; Wang, K.*; Uchibori, Akihiro; Okano, Yasushi; Pellegrini, M.*; Erkan, N.*; Takata, Takashi*; Okamoto, Koji*

Applied Sciences (Internet), 13(13), p.7705_1 - 7705_29, 2023/07

 Times Cited Count:2 Percentile:27.59(Chemistry, Multidisciplinary)

Journal Articles

Comprehensive analysis and evaluation of Fukushima Daiichi Nuclear Power Station Unit 3

Yamashita, Takuya; Honda, Takeshi*; Mizokami, Masato*; Nozaki, Kenichiro*; Suzuki, Hiroyuki*; Pellegrini, M.*; Sakai, Takeshi*; Sato, Ikken; Mizokami, Shinya*

Nuclear Technology, 209(6), p.902 - 927, 2023/06

 Times Cited Count:5 Percentile:87.90(Nuclear Science & Technology)

392 (Records 1-20 displayed on this page)