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Abe, Takumi; Suzuki, Taiga*; Okamura, Tomohiro*; Nakase, Masahiko*
Annals of Nuclear Energy, 232, p.112224_1 - 112224_7, 2026/07
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)Sun, R.; Abe, Yukiko; Atarashi-Andoh, Mariko; Koarashi, Jun
Soil Biology & Biochemistry, 218, p.110150_1 - 110150_12, 2026/07
Times Cited Count：0 Percentile：0.00(Soil Science)The role of minerals in soil carbon sequestration has been increasingly recognized. However, the mechanism by which mineral-associated organic matter (MAOM) resists microbial decomposition remains an open question. We prepared MAOM on amorphous allophane and crystalline kaolinite with different organic matter (OM) proxies, characterized the affinity strength of these associations using isothermal titration calorimetry and X-ray photoelectron spectroscopy, and quantified their microbial mineralization through aerobic incubation. We found that amorphous allophane displayed greater OM adsorption capacity due to its higher specific surface area; in contrast, crystalline kaolinite exhibited stronger binding with OM, consistent with its predominant inner-sphere complexation. Furthermore, lower MAOM mineralization was found corresponding to higher Langmuir affinity. This inverse relationship was more pronounced than the correlation with the amount of OM adsorbed by minerals. These findings suggest that the overall MAOM stability is controlled by a balance between binding strength and adsorption capacity. Namely, stronger binding affinity enhances microbial resistance of MAOM, while the abundance of mineral sites determines the amount of MAOM accessible for microbial decomposition. This study presents a novel mechanistic understanding of the MAOM dynamics and refines the prevailing perspective on MAOM persistence.
Sakurai, Takeshi; Fukushima, Masahiro
JAEA-Data/Code 2026-001, 235 Pages, 2026/06
JAEA-Data-Code-2026-001.pdf:16.46MB
Experimental data obtained in the Fast Critical Assembly (FCA) simulating a High Conversion Light Water Reactor (HCLWR) were evaluated for the criticality of assemblies XV series in the second phase of FCA-HCLWR experiments, primarily using plutonium fuel. Analysis was performed using the nuclear data libraries JENDL-4.0 and JENDL-5 and the Monte Carlo code MVP3, which calculates neutron transport using the continuous energy method. In the evaluation of criticality, a detailed uncertainty assessment was performed, taking into account the effects of uncertainties in the weight and composition of the uranium and plutonium fuel plates and simulated material plates such as moderator in the FCA. The analysis involved detailed simulations of the fuel and lattice tube structures in the FCA. The calculation results for the effective multiplication factor overestimated the experimental results by 0.4% to 0.8% using both JENDL-4.0 and JENDL-5.
Soma, Yasutaka; Komatsu, Atsushi; Igarashi, Takahiro
Corrosion Science, 265, p.113182_1 - 113182_13, 2026/06
Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)Segawa, Mariko; Nishinaka, Ichiro*; Maeda, Makoto; Toh, Yosuke
Isotope News, (805), p.7 - 10, 2026/06
no abstracts in English
O/TO in the gas phase with nonresonant laser pulsesNamba, Tomotaro; Kumagai, Yuta
Journal of Chemical Physics, 164(21), p.214303_1 - 214303_9, 2026/06
Miyazaki, Kanako*; Fueda, Kazuki*; Kadowaki, Masanao; Terada, Hiroaki; Kozai, Naofumi; Iwata, Hajime; Horie, Kenji*; Takehara, Mami*; Yamasaki, Shinya*; Grambow, B.*; et al.
Journal of Hazardous Materials, 511, p.142180_1 - 142180_17, 2026/06
Times Cited Count：0
Zr(n, 
)
Zr and 
Zr(n, )
Zr reactions at JRR-3Nakamura, Shoji; Kimura, Atsushi; Endo, Shunsuke; Rovira Leveroni, G.; Shibahara, Yuji*
Journal of Nuclear Science and Technology, 63(6), p.653 - 666, 2026/06
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)Nakamura, Shoji; Shibahara, Yuji*; Kimura, Atsushi; Endo, Shunsuke; Rovira Leveroni, G.
KURNS Progress Report 2025, P. 101, 2026/06
no abstracts in English
Tc separation/concentration technology from 
Mo by (n,) method, 4Suematsu, Hisayuki*; Yang, Y.*; Ito, Akito*; Le, A. V.*; Su, Y.*; Kato, Suzuna*; Do, T. M. D.*; Suzuki, Tatsuya*; Osawa, Naoki*; Fujita, Yoshitaka; et al.
KURNS Progress Report 2025, P. 118, 2026/06
no abstracts in English
Nakase, Masahiko*; Nakazawa, Ryota*; Mishima, Ria
Next Chemical Engineering (Internet), 2, p.100051_1 - 100051_14, 2026/06
Furuta, Takuya; Hashimoto, Shintaro; Ogawa, Tatsuhiko; Tanimura, Yoshihiko
Nuclear Instruments and Methods in Physics Research A, 1086, p.171320_1 - 171320_8, 2026/06
Times Cited Count：0 Percentile：0.00(Instruments & Instrumentation)A new function to incorporate nuclear data libraries with outgoing particles plus residual nuclei in specific excitation states for neutron-induced reactions has been implemented in a Monte Carlo simulation code, Particle and Heavy Ion Transport code System (PHITS). With this function, accurate predictions of outgoing particle spectra and angular distributions according to the nuclear data libraries become possible, while accounting for production of residual nuclei and de-excitation gammas, conserving total energy and momentum in each event. This feature allows users to perform high-precision simulations of detector responses and radiation damage in materials.
Nuclear Science and Engineering Center; NXR Development Center
JAEA-Evaluation 2026-001, 44 Pages, 2026/05
JAEA-Evaluation-2026-001.pdf:0.93MB
JAEA-Evaluation-2026-001-appendix(CD-ROM).zip:18.67MB
Japan Atomic Energy Agency (hereinafter referred to as "JAEA") consults an assessment committee, "Evaluation Committee of Research Activities for Nuclear Science and Engineering" (hereinafter referred to as "Committee") for interim evaluation of "Nuclear Science and Engineering", in accordance with "General Guideline for the Evaluation of Government Research and Development (R&D) Activities" by Cabinet Office, Government of Japan, "Guideline for Evaluation of R&D in Ministry of Education, Culture, Sports, Science and Technology" and "Regulation on Conduct for Evaluation of R&D Activities" by the JAEA. In response to the JAEA's request, the Committee evaluated research activities based on the materials prepared by JAEA. This report summarizes the results of the assessment by the Committee with the Committee report attached.
I seawater concentrations off Fukushima and potential of 129I as an oceanographic tracer for ALPS-treated waterSuzuki, Takashi; Otosaka, Shigeyoshi*; Takata, Hyoe*; Kuwabara, Jun; Nakanishi, Takahiro; Ikenoue, Tsubasa
Environmental Science & Technology, 60(17), p.13123 - 13131, 2026/05
Times Cited Count：0As a results of the 2011 Fukushima Daiichi Nuclear Power Plant accident, long-lived radioactive I has been released into the environment, with additional releases beginning in 2023 through ALPS-treated water. To study its long-term variation and potential as an oceanographic tracer, I concentrations in seawater off Fukushima were measured from 2012 to 2024. The highest concentration, 445
10
Bq/L, was observed in 2013 near the plant. Levels have since declined toward the pre-accident value of 1.7610 Bq/L. Spatial and temporal changes in the I/
Cs ratio indicate the influence of small water masses and support its use as a tracer in areas with complex ocean circulation.
Iwamoto, Nobuyuki
Journal of Nuclear Science and Technology, 63(5), p.581 - 593, 2026/05
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)Koarashi, Jun; Ito, Masayuki*; Atarashi-Andoh, Mariko; Kokubu, Yoko; Matsueda, Makoto; Kusin, K.*; Jaya, A.*; Dohong, S.*; Hirano, Takashi*
Nature Communications (Internet), 17, p.4369_1 - 4369_9, 2026/05
Times Cited Count：0Tropical peatlands are globally important, millennia-old carbon sinks, yet unprecedented human-driven degradation is triggering alarming carbon emissions. Comprehensive quantification of carbon dynamics across the disturbance sequence, from peat swamp forests to drained and fire-impacted peatlands, remains a critical knowledge gap. Here we show that over 18 years (1996-2014), drainage and subsequent peat fires released approximately 30-41 kg C m
from peatlands in Central Kalimantan, Indonesia, using radiocarbon dating of peat profiles and groundwater dissolved organic carbon. Drainage contributed 5-11 kg C m, primarily from centuries- to millennium-old, previously waterlogged peat. Fires released 23-32 kg C m from peat accumulated over the past 3,000 years, initiating progressive oxidative decomposition of older peat. Extrapolation to Indonesia's disturbed peatlands suggests a release of 0.81-3.70 Gt between 1996 and 2014, with ongoing decomposition releasing an additional 0.03-0.08 Gt C annually, accelerating the impact on the global carbon balance.
Aizawa, Naoto*; Watanabe, Tomoaki; Chiba, Go*; Tada, Kenichi; Fujita, Tatsuya*; Yamamoto, Akio*
Nuclear Engineering and Technology, 58(5), p.104176_1 - 104176_16, 2026/05
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)Sato, Takuto
Tsukuba Daigaku Keisan Kagaku Kenkyu Senta 2025 Nen-do Gakusai Kyodo Puroguramu Riyo Hokokusho (Internet), 2 Pages, 2026/05
no abstracts in English
Sato, Yuhi*; Tani, Takashi*; Ikenoue, Tsubasa; Kawamura, Hideyuki; Omori, Yuko*
Environmental Science and Pollution Research, 33(13), p.5818 - 5826, 2026/04
Tokyo Electric Power Company Holdings began the oceanic release of treated water from the Fukushima Daiichi Nuclear Power Station (FDNPS) in August 2023, in which radioactive materials were effectively removed using the Advanced Liquid Processing System (ALPS). The environmental behavior of tritium, accounting for almost all radioactivity in ALPS-treated water, is of critical scientific and social concern. The accumulation possibility of tritium in marine organisms under the release conditions of ALPS-treated water was reviewed to ensure the safety of fishery products collected off the Fukushima coast and prevent unfounded reputation damages to the products. First, previous findings from actual measurements and numerical model estimations of the distribution of tritium derived from ALPS-treated water in seawater off the Fukushima coast are summarized to discuss the impact of oceanic release on tritium levels in seawater. As a result, the impact is suggested to be highly limited, which is indistinguishable from a natural level except for within 200 km from FDNPS. Second, the accumulation possibility of organically bound tritium (OBT) in marine organisms, such as phytoplankton, seaweed, and fish, was assessed using previous findings obtained from experimental and numerical studies, resulting in far smaller OBT accumulations in those organisms compared to the food-chain guideline proposed by FAO/WHO. Finally, the risks of internal exposure through the ingestion of fishery products collected off the Fukushima coast are discussed and quantitatively explained to be minimal especially in comparison with the food-chain guideline. However, continuous environmental monitoring of the oceanic release of ALPS-treated water is considered essential.
