Article
Green & Sustainable Science & Technology
Bin Feng, Yuichi Onda, Yoshifumi Wakiyama, Keisuke Taniguchi, Asahi Hashimoto, Yupan Zhang
Summary: Mechanical soil decontamination is an important tool in remediating contaminated soils. The study found that upstream decontamination caused persistently excessive suspended sediment loads downstream, but rapid vegetation recovery can shorten the duration of such unsustainable impacts. Future upstream remediation should consider pre-assessing local natural restoration and preparing appropriate revegetation measures in remediated regions for downstream sustainability.
NATURE SUSTAINABILITY
(2022)
Article
Environmental Sciences
Norbert Kavasi, Hideki Arae, Tatsuo Aono, Sarata Kumar Sahoo
Summary: Sr-90 and Cs-137 activity concentrations in soil samples from the Fukushima exclusion zone were determined using radiometric methods. The results showed that Sr-90 and Cs-137 activity concentrations ranged from 3 to 1050 Bq kg(-1) and 0.7 to 6770 kBq center dot kg(-1), respectively. A strong positive correlation between Sr-90 and Cs-137 activity concentration was found, and it was confirmed that Sr-90 has higher mobility in Japanese soil samples. The activity ratio of Sr-90/Cs-137 indicated that the Sr-90 released to the atmosphere was negligible compared to other nuclear accidents, and Cs-137 remains the primary pollutant of the Fukushima Dai-ichi Nuclear Power Station accident.
ENVIRONMENTAL POLLUTION
(2023)
Article
Engineering, Environmental
Xinwen Dong, Sheng Fang, Shuhan Zhuang, Yuhan Xu, Yungang Zhao, Li Sheng
Summary: This paper proposes an objective method to handle the continuous release of atmospheric 137Cs. The method reduces oscillations caused by discrepancies between the model and observations and recovers missing releases using total variation regularization. Applied to the Fukushima accident, the method produces a source term that accurately approximates continuous releases, significantly improving air concentration and deposition simulations.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Shin-ichi Hayama, Aki Tanaka, Setsuko Nakanishi, Fumiharu Konno, Yoshi Kawamoto, Kazuhiko Ochiai, Toshinori Omi
Summary: Over the 10 years following the Fukushima nuclear accident, changes in the muscle Cs-137 concentration of wild Japanese monkeys were measured. The concentration decreased over time, but no significant difference was found between 2017 and 2020, suggesting a continued accumulation of Cs-137 in muscle.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Multidisciplinary Sciences
Terumi Dohi, Yoshihito Ohmura, Kazuya Yoshimura, Takayuki Sasaki, Kenso Fujiwara, Seiichi Kanaizuka, Shigeo Nakama, Kazuki Iijima
Summary: The study found that the Cs-137 inventory in lichens from Fukushima was significantly higher than in adjacent barks, and that the distribution of radioactivity was heterogeneous in both lichens and barks. Lichens were able to capture fine particles, including radiocaesium particles, with radioactivity concentrated more towards their interiors.
Article
Engineering, Environmental
Lavrans Skuterud, Tanya Helena Hevroy, Havard Thorring, Martin Album Ytre-Eide
Summary: This study presents a novel dynamic model for estimating Cs-137 concentrations in reindeer meat at any given time using large data sets. The model utilizes detailed soil data, knowledge of reindeer migration, and soil-to-vegetation transfer information. The validation exercise shows promising results, suggesting that the model can be a useful tool for predicting contamination levels in reindeer meat.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Motoko Morimoto, Jin Kobayashi, Yasushi Kino
Summary: The Fukushima Daiichi Nuclear Power Plant accident resulted in widespread contamination of radioactive cesium in Japan. Wild boars in the affected area showed decreased radioactive cesium levels compared to immediately after the accident, but still exceeded regulatory limits. The expression of certain genes related to immune response and cell growth were elevated in the small intestines of these wild boars. However, no pathological damage was observed. Long-term monitoring is necessary, but the body's response to the contaminated environment appears appropriate.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Hiroshi Yasuda
Summary: The study conducted long-term cancer risk projections on land contaminated by radiocesium deposition under different surface conditions, showing that concerns about the health consequences for local residents are valid and important to consider.
APPLIED SCIENCES-BASEL
(2021)
Article
Geosciences, Multidisciplinary
Cecile Asanuma-Brice, Olivier Evrard, Thomas Chalaux
Summary: Large volumes of radionuclides were deposited on the soils in North-eastern Japan after the accident at the Fukushima Dai-ichi nuclear Power Plant in 2011. The evacuation of the village of Iitate, located in the main radioactive plume, lasted from 2011 to 2017. Despite reopening, less than ten percent of the original population had returned to live in the village by January 2022, mostly elderly people. The difficulty of adjusting to the post-accident environment, contaminated forests, and lack of facilities are major challenges.
INTERNATIONAL JOURNAL OF DISASTER RISK REDUCTION
(2023)
Article
Multidisciplinary Sciences
Yukihisa Sanada, Yoshimi Urabe, Toshiharu Misonou, Takehiko Shiribiki, Takahiro Nakanishi, Yusuke Watanabe, Tadahiko Tsuruta
Summary: This study visualized the distribution of radiocesium in sediment around the Fukushima Daiichi Nuclear Power Plant using data from a towed gamma-ray detection system, with the uncertainty of the map evaluated through comparison with sediment core sample data. The characteristics of radiocesium distribution were analyzed considering seafloor topography and geological maps, while the formation of Cs-137 anomaly at estuaries was studied using contour maps. Validation of the map showed good agreement with actual sediment core samples, with the Cs-137 concentration decreasing over time due to uncertainties.
SCIENTIFIC REPORTS
(2021)
Review
Endocrinology & Metabolism
Vladimir Drozdovitch
Summary: The Chernobyl accident led to significant release of radioactive material, especially I-131, causing increased thyroid cancer and diseases. Individual and population-average thyroid doses varied, with I-131 intake being the main exposure pathway. Individual doses due to different exposure pathways had uncertainties associated with them.
FRONTIERS IN ENDOCRINOLOGY
(2021)
Article
Environmental Sciences
Ana-Maria Blebea-Apostu, Romul Mircea Margineanu, Octavian G. Duliu, Diana Persa, Mariana Claudia Gomoiu
Summary: The total Cs-137 inventory of Chernobyl contamination in Romanian soil samples was estimated in 1993 and 2016. The study found that the Cs-137 inventory varied between 0.4 and 187 kBq/m(2) in 1993, and between 0.2 and 94.2 kBq/m(2) in 2016. The spatial distribution analysis showed a decrease of about 3 times in the Cs-137 inventory over the entire Romanian territory, exceeding the natural decay, suggesting the washout and incorporation into plants. The maximum contribution of Cs-137 to population exposure did not exceed 0.2 mSv/year in both 1993 and 2016.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Multidisciplinary Sciences
Yumiko Ishii, Hikaru Miura, Jaeick Jo, Hideki Tsuji, Rie Saito, Kazuma Koarai, Hiroki Hagiwara, Tadayuki Urushidate, Tatsuhiro Nishikiori, Toshihiro Wada, Seiji Hayashi, Yoshio Takahashi
Summary: Variation in radiocesium concentrations in aquatic insects was investigated in this study. It was found that some caddisfly larvae contained radiocesium-bearing microparticles (CsMPs), which were also present in potential food sources of the larvae. This suggests that aquatic insects can ingest CsMPs.
Article
Biology
Ondrej Harkut, Petr Alexa, Radim Uhlar
Summary: The study compared the specific activities of Cs-137 and K-40 in stipes and caps of three common mushroom species measured at two locations in 2011. The highest Cs-137 values were found in caps of Xerocomus badius and Russula ochroleuca in the Opava area. The effective dose due to radiocaesium intake in Xerocomus badius was estimated, showing no significant risk for public health.
Article
Multidisciplinary Sciences
J. M. Kaste, P. Volante, A. J. Elmore
Summary: The study highlights the ongoing impact of Cs-137 contamination from mid-20th century nuclear testing on the environment, showing that vegetation and bees continue to cycle Cs-137 in regions with low soil potassium, leading to magnification of the contaminant in honey. This suggests that the environmental legacy of Cs-137 pollution can persist for more than sixty years, disproportionately exposing plants and animals to ionizing radiation.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Analytical
Y. K. Sambayev, A. G. Zhumalina, K. Sh. Zhumadilov, A. Sakaguchi, T. Kajimoto, K. Tanaka, S. Endo, N. Kawano, M. Hoshi, M. Yamamoto
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2020)
Article
Chemistry, Inorganic & Nuclear
N. Hu, H. Tanaka, T. Takata, S. Endo, S. Masunaga, M. Suzuki, Y. Sakurai
APPLIED RADIATION AND ISOTOPES
(2020)
Article
Biology
Satoru Endo, Yuki Matsutani, Tsuyoshi Kajimoto, Kenichi Tanaka, Masatoshi Suzuki
JOURNAL OF RADIATION RESEARCH
(2020)
Article
Nuclear Science & Technology
Toshitaka Oka, Atsushi Takahashi, Kazuma Koarai, Yusuke Mitsuyasu, Yasushi Kino, Tsutomu Sekine, Yoshinaka Shimizu, Mirei Chiba, Toshihiko Suzuki, Ken Osaka, Keiichi Sasaki, Yusuke Urushihara, Satoru Endo, Masatoshi Suzuki, Hisashi Shinoda, Manabu Fukumoto
RADIATION MEASUREMENTS
(2020)
Article
Chemistry, Inorganic & Nuclear
Kenichi Tanaka, Tsuyoshi Kajimoto, Yoshinori Sakurai, Gerard Bengua, Satoru Endo
APPLIED RADIATION AND ISOTOPES
(2020)
Article
Biology
Valeriy Stepanenko, Andrey Kaprin, Sergey Ivanov, Peter Shegay, Kassym Zhumadilov, Aleksey Petukhov, Timofey Kolyzhenkov, Viktoria Bogacheva, Elena Zharova, Elena Iaskova, Nailya Chaizhunusova, Dariya Shabdarbayeva, Gaukhar Amantayeva, Arailym Baurzhan, Bakhyt Ruslanova, Zhaslan Abishev, Madina Apbassova, Ynkar Kairkhanova, Darkhan Uzbekov, Zaituna Khismetova, Yersin Zhunussov, Nariaki Fujimoto, Hitoshi Sato, Kazuko Shichijo, Masahiro Nakashima, Aya Sakaguchi, Shin Toyoda, Noriyuki Kawano, Megu Ohtaki, Keiko Otani, Satoru Endo, Masayoshi Yamamoto, Masaharu Hoshi
RADIATION AND ENVIRONMENTAL BIOPHYSICS
(2020)
Article
Nuclear Science & Technology
Masashi Takada, Tomoya Nunomiya, Akihiko Masuda, Tetsuro Matsumoto, Hiroki Tanaka, Satoshi Nakamura, Satoru Endo, Masaru Nakamura, Kei Aoyama, Osamu Ueda, Masataka Narita, Takashi Nakamura
RADIATION MEASUREMENTS
(2020)
Article
Instruments & Instrumentation
Tsuyoshi Kajimoto, Kenichi Tanaka, Satoru Endo, So Kamada, Hiroki Tanaka, Masashi Takada, Tsuyoshi Hamano
Summary: The study measured the double differential cross sections (DDXs) of neutron production by 135 and 180 MeV protons as benchmark data for calculating neutron doses in proton therapy. It was found that the calculated DDXs underestimated the measured values, especially at forward angles, suggesting that exposure evaluations using simulation codes would underestimate the neutron dose in proton therapy.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2021)
Article
Chemistry, Inorganic & Nuclear
Masashi Takada, Tomoya Nunomiya, Akihiko Masuda, Tetsuro Matsumoto, Hiroki Tanaka, Satoshi Nakamura, Satoru Endo, Masaru Nakamura, Kei Aoyama, Osamu Ueda, Masataka Narita, Takashi Nakamura
Summary: The team has developed a new real-time neutron detector that can accurately measure the neutron beam in boron neutron capture therapy, showing good performance in experimental results.
APPLIED RADIATION AND ISOTOPES
(2021)
Article
Instruments & Instrumentation
Masashi Takada, Yohei Abe, Satoshi Nakamura, Akihiko Masuda, Tsuyoshi Kajimoto, Satoru Endo
Summary: The neutron spectrometer designed for measuring low-energy neutron beam for boron neutron capture therapy (BNCT) uses a boron carbide block as a neutron moderator and nine thin neutron silicon sensors with variable detection efficiency. By simulating the spectrometer's neutron energy response functions, it is able to increase neutron detection efficiencies to measure the BNCT neutron beam in a short time.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2021)
Article
Biology
Valeriy Stepanenko, Andrey Kaprin, Sergey Ivanov, Peter Shegay, Hitoshi Sato, Shin Toyoda, Noriyuki Kawano, Nariaki Fujimoto, Satoru Endo, Viktoria Bogacheva, Timofey Kolyzhenkov, Artem Khailov, Kassym Zhumadilov, Aidana Zhumalina, Dana Yerimbetova, Masaharu Hoshi
Summary: This study retrospectively estimated the 'dose-depth' profile of a quartz-containing tile from the building of Hiroshima University using the method of single quartz grain luminescence retrospective dosimetry. It was found that there may have been beta irradiation in thin layers of the sample near the surface of the tile.
JOURNAL OF RADIATION RESEARCH
(2022)
Article
Biology
Valeriy Stepanenko, Hitoshi Sato, Nariaki Fujimoto, Kazuko Shichijo, Shin Toyoda, Noriyuki Kawano, Satoru Endo, Andrey Kaprin, Sergey Ivanov, Peter Shegay, Alexey Petukhov, Timofey Kolyzhenkov, Victoria Bogacheva, Nailya Chaizhunusova, Dariya Shabdarbaeva, Kassym Zhumadilov, Masaharu Hoshi
Summary: Experimental animals exposed to neutron-activated Mn-56 powder have higher internal radiation doses compared to external radiation doses.
JOURNAL OF RADIATION RESEARCH
(2022)
Article
Biology
Valeriy Stepanenko, Andrey Kaprin, Sergey Ivanov, Peter Shegay, Viktoria Bogacheva, Hitoshi Sato, Kazuko Shichijo, Shin Toyoda, Noriyuki Kawano, Megu Ohtaki, Nariaki Fujimoto, Satoru Endo, Nailya Chaizhunusova, Dariya Shabdarbaeva, Kassym Zhumadilov, Masaharu Hoshi
Summary: Manganese-56 (Mn-56) is a significant radioactive isotope generated by neutron activation in the aftermath of atomic bombings. The radiation emissions from Mn-56 and its decay product, Fe-56, include gamma rays, beta particles, Auger electrons, and X-rays. The dispersion of neutron-activated Mn-56 in the air can result in the inhalation of radioactive microparticles into the lungs. The investigation of the spatial distribution of internal doses in biological tissue exposed to Mn-56 is crucial for understanding the potential radiation exposure of lung alveoli and alveolar ducts.
JOURNAL OF RADIATION RESEARCH
(2022)
Article
Biology
Kassym Zhumadilov, Alexander Ivannikov, Valeriy Stepanenko, Shin Toyoda, Polat Kazymbet, Andrey Kaprin, Sergey Ivanov, Peter Shegay, Satoru Endo, Masaharu Hoshi
Summary: Electron spin resonance (ESR) dosimetry was used to study the individual absorbed doses for victims of the Hiroshima bomb who lived in the 'black rain' area. The study found that the population in this area was exposed to additional radiation, which was attributed to the 'black rain'. The study also investigated the contribution of dental X-rays and head CT scans to the individual dose.
JOURNAL OF RADIATION RESEARCH
(2022)
Article
Physics, Multidisciplinary
V. F. Stepanenko, K. Sh. Zhumadilov, M. Hoshi, Y. T. Zhunussov, S. Endo, M. Ohtaki, K. Otani, N. Fujimoto, K. Shichijo, N. Kawano, A. Sakaguchi, N. Z. Chaizhunusova, D. M. Shabdarbaeva, A. Baurzhan, V. S. Gnyrya, A. S. Zimkhanov, A. D. Kaprin, S. A. Ivanov, E. Yaskova, I. Belukha, T. Kolyzhenkov, A. D. Petukhov, V. Bogacheva
BULLETIN OF THE UNIVERSITY OF KARAGANDA-PHYSICS
(2019)