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奈良 禎太*; 加藤 昌治*; 佐藤 努*; 河野 勝宣*; 佐藤 稔紀

Journal of MMIJ, 138(4), p.44 - 50, 2022/04



The Japan Health Physics Society Guideline on Dose Monitoring for the Lens of the Eye

横山 須美*; 辻村 憲雄; 橋本 周; 吉富 寛; 加藤 昌弘*; 黒澤 忠弘*; 立崎 英夫*; 関口 寛*; 小口 靖弘*; 小野 孝二*; et al.

Journal of Radiation Protection and Research, 47(1), p.1 - 7, 2022/03



Seismic classification of high temperature engineering test reactor

小野 正人; 清水 厚志; 大橋 弘史; 濱本 真平; 猪井 宏幸; 徳原 一実*; 野本 恭信*; 島崎 洋祐; 飯垣 和彦; 篠崎 正幸

Nuclear Engineering and Design, 386, p.111585_1 - 111585_9, 2022/01



Development of guidelines on radiation protection for the lens of the eye in Japan

横山 須美*; 岩井 敏*; 辻村 憲雄; 橋本 周; 吉富 寛; 加藤 昌弘*; 黒澤 忠弘*; 立崎 英夫*; 関口 寛*; 小口 靖弘*; et al.

Proceedings of 15th International Congress of the International Radiation Protection Association (IRPA-15) (Internet), 8 Pages, 2022/00

In Japan, new regulations that revise the eye lens dose limit, operational quantities, and measurement positions for the dose of the lens will be enforced from April 2021. Based on the International and national guidelines, the results of the Radiation Safety Research Promotion Fund of Nuclear Regulatory Authority (NRA), and other studies, the Working Group of Radiation Protection Standardization Committee, the Japan Health Physics Society (JHPS), developed the guideline on the radiation monitoring for the lens of the eye. In July 2020, the guideline was published by the JHPS. The guideline consists of five parts: a main text, explanations, references, three attachments, and twenty-six questions. In the questions, the corresponding answers were prepared, and specific examples were given so that similar issues could be dealt with. In the working group, in particular, time was spent discussing judgment of the criteria of non-uniform exposure and the management criteria set to not exceed the dose limit to the lens. With the development of the guidelines on the radiation monitoring of the lens of the eye, the radiation managers and workers will be able to smoothly comply with revised regulations and optimize radiation protection.


Radioactivity and radionuclides in deciduous teeth formed before the Fukushima-Daiichi Nuclear Power Plant accident

高橋 温*; 千葉 美麗*; 棚原 朗*; 相田 潤*; 清水 良央*; 鈴木 敏彦*; 村上 忍*; 小荒井 一真; 小野 拓実*; 岡 壽崇; et al.

Scientific Reports (Internet), 11(1), p.10355_1 - 10355_11, 2021/05

 被引用回数:1 パーセンタイル:65.97(Multidisciplinary Sciences)

The Fukushima-Daiichi Nuclear Power Plant (FNPP) accident released substantial amounts of radionuclides into the environment. We collected 4,957 deciduous teeth, from children living in Fukushima and reference prefectures. Radioactivity was detected in most of the teeth examined and was attributed to the presence of natural radionuclides, including $$^{40}$$K and daughter nuclides in $$^{238}$$U and $$^{232}$$Th series. Additionally, artificial radionuclides, $$^{90}$$Sr and $$^{137}$$Cs, were detected in the teeth obtained from children from Fukushima and the reference prefectures. However, these radionuclides were not believed to have originated from the FNPP accident. Because the teeth examined in the present study were formed before the FNPP accident occurred, the aforementioned findings may serve as important control data for future studies regarding the radioactivity of teeth formed after the FNPP accident.



与能本 泰介; 中島 宏*; 曽野 浩樹; 岸本 克己; 井澤 一彦; 木名瀬 政美; 長 明彦; 小川 和彦; 堀口 洋徳; 猪井 宏幸; et al.

JAEA-Review 2020-056, 51 Pages, 2021/03




Morphological reproductive characteristics of testes and fertilization capacity of cryopreserved sperm after the Fukushima accident in raccoon (${it Procyon lotor}$)

小松 一樹*; 岩崎 亜美*; 村田 康輔*; 山城 秀昭*; Goh, V. S. T.*; 中山 亮*; 藤嶋 洋平*; 小野 拓実*; 木野 康志*; 清水 良央*; et al.

Reproduction in Domestic Animals, 56(3), p.484 - 497, 2021/03



High temperature gas-cooled reactors

武田 哲明*; 稲垣 嘉之; 相原 純; 青木 健; 藤原 佑輔; 深谷 裕司; 後藤 実; Ho, H. Q.; 飯垣 和彦; 今井 良行; et al.

High Temperature Gas-Cooled Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.5, 464 Pages, 2021/02




西山 裕; 岩井 正樹; 千葉 悠介; 椿 裕彦; 大野 隼人*; 早坂 寿郎*; 羽生 敏紀*

JAEA-Technology 2020-007, 18 Pages, 2020/09





西山 裕; 岩井 正樹; 椿 裕彦; 千葉 悠介; 早坂 寿郎*; 大野 隼人*; 羽生 敏紀*

JAEA-Technology 2020-006, 26 Pages, 2020/08




Structural, magnetic, transport, and thermoelectric properties of the pseudobrookite AlTi$$_{2}$$O$$_{5}$$-Ti$$_{3}$$O$$_{5}$$ system

高濱 隆成*; 石井 透依*; 犬童 代梧*; 有薗 実駿*; 寺倉 千恵子*; 十倉 好紀*; 竹下 直*; 野田 正亮*; 桑原 英樹*; 斎木 琢夫*; et al.

Physical Review Materials (Internet), 4(7), p.074401_1 - 074401_11, 2020/07

 被引用回数:1 パーセンタイル:20.84(Materials Science, Multidisciplinary)

We investigated the structural, magnetic, transport, and high-temperature thermoelectric properties of single crystals of the pseudobrookite Al$$_{1-x}$$Ti$$_{2+x}$$O$$_{5}$$ for $$0 le x le 1$$ grown using a floating zone. We found a correlation of spin-singlet Ti$$^{3+}$$-Ti$$^{3+}$$ dimers coupled with the lattice even in the conductive $$alpha$$ and $$lambda$$ phases which develops with increasing $$x$$. This developing dimer correlation reduces the number of unpaired Ti$$^{3+}$$ ions, which makes the compound more conductive owing to the suppression of disorder for $$x$$ up to about 0.75. The dimer fluctuation causes a critical enhancement of the magnetic susceptibility at around 150 K in the $$lambda$$ phase near the boundary ($$x sim 0.9$$) between the $$lambda$$ and the $$beta$$ phases. Such a correlation of the spin-singlet Ti$$^{3+}$$-Ti$$^{3+}$$ dimers may produce a high Seebeck coefficient in the conductive $$alpha$$ and $$lambda$$ phases leading to a large thermoelectric power factor at high temperatures.


幌延深地層研究計画における地下施設での調査研究段階; (第3段階: 必須の課題2015-2019年度)研究成果報告書

中山 雅; 雑賀 敦; 木村 駿; 望月 陽人; 青柳 和平; 大野 宏和; 宮川 和也; 武田 匡樹; 早野 明; 松岡 稔幸; et al.

JAEA-Research 2019-013, 276 Pages, 2020/03




Permeability measurement for macro-fractured granite using water including clay

奈良 禎太*; 加藤 昌治*; 佐藤 努*; 河野 勝宣*; 佐藤 稔紀

Proceedings of 5th ISRM Young Scholars' Symposium on Rock Mechanics and International Symposium on Rock Engineering for Innovative Future (YSRM 2019 and REIF 2019) (USB Flash Drive), 6 Pages, 2019/12



Carbon dioxide balance in early-successional forests after forest fires in interior Alaska

植山 雅仁*; 岩田 拓記*; 永野 博彦; 田原 成美*; 岩間 千絵*; 原薗 芳信*

Agricultural and Forest Meteorology, 275, p.196 - 207, 2019/09

 被引用回数:13 パーセンタイル:90.95(Agronomy)

北米の北方林生態系において、森林火災は主要なかく乱要因であり、当該地域における炭素収支を決定する重要なプロセスである。本研究では内陸アラスカの2つの森林火災跡地において、合計13年間にわたり主要な温室効果ガスである二酸化炭素(CO$$_{2}$$)の交換量を渦相関法によって観測した。観測データから、火災後の生態系が植生の回復に伴ってCO$$_{2}$$の放出源から吸収源になるためには13年かかることが分かった。さらに、観測データを基に火災後の初期植生遷移段階におけるCO$$_{2}$$収支の広域評価を内陸アラスカ全土に対して行ったところ、1998年から2017年までの間に火災後の生態系から放出されたCO$$_{2}$$量(35-48 Tg C)は、火災に伴う燃焼によって大気へ直接放出されたCO$$_{2}$$量(156 Tg C)の1/3から1/4であると見積もられた。以上より、火災後に生態系から放出されるCO$$_{2}$$量は、州スケールでのCO$$_{2}$$収支に重要であることが示唆された。


First determination of Pu isotopes ($$^{239}$$Pu, $$^{240}$$Pu and $$^{241}$$Pu) in radioactive particles derived from Fukushima Daiichi Nuclear Power Plant accident

五十嵐 淳哉*; Zheng, J.*; Zhang, Z.*; 二宮 和彦*; 佐藤 志彦; 福田 美保*; Ni, Y.*; 青野 辰雄*; 篠原 厚*

Scientific Reports (Internet), 9(1), p.11807_1 - 11807_10, 2019/08

 被引用回数:9 パーセンタイル:66.73(Multidisciplinary Sciences)



Research and development on membrane IS process for hydrogen production using solar heat

Myagmarjav, O.; 岩月 仁; 田中 伸幸; 野口 弘喜; 上地 優; 井岡 郁夫; 久保 真治; 野村 幹弘*; 八巻 徹也*; 澤田 真一*; et al.

International Journal of Hydrogen Energy, 44(35), p.19141 - 19152, 2019/07

 被引用回数:12 パーセンタイル:67.04(Chemistry, Physical)

Thermochemical hydrogen production has attracted considerable interest as a clean energy solution to address the challenges of climate change and environmental sustainability. The thermochemical water-splitting iodine-sulfur (IS) process uses heat from nuclear or solar power and thus is a promising next-generation thermochemical hydrogen production method that is independent of fossil fuels and can provide energy security. This paper presents the current state of research and development of the IS process based on membrane techniques using solar energy at a medium temperature of 600$$^{circ}$$C. Membrane design strategies have the most potential for making the IS process using solar energy highly efficient and economical and are illustrated here in detail. Three aspects of membrane design proposed herein for the IS process have led to a considerable improvement of the total thermal efficiency of the process: membrane reactors, membranes, and reaction catalysts. Experimental studies in the applications of these membrane design techniques to the Bunsen reaction, sulfuric acid decomposition, and hydrogen iodide decomposition are discussed.


Quantum dynamics of hydrogen in the iron-based superconductor LaFeAsO$$_{0.9}$$D$$_{0.1}$$ measured with inelastic neutron spectroscopy

山浦 淳一*; 平賀 晴弘*; 飯村 壮史*; 村場 善行*; Bang, J.*; 池内 和彦*; 中村 充孝; 稲村 泰弘; 本田 孝志*; 平石 雅俊*; et al.

Physical Review B, 99(22), p.220505_1 - 220505_6, 2019/06


 被引用回数:1 パーセンタイル:10.83(Materials Science, Multidisciplinary)



Gapless magnetic excitation in a heavily electron-doped antiferromagnetic phase of LaFeAsO$$_{0.5}$$D$$_{0.5}$$

玉造 博夢*; 平賀 晴弘*; 池内 和彦*; 飯村 壮史*; 村場 善行*; 中村 充孝; 佐賀山 基*; 山浦 淳一*; 村上 洋一*; 倉本 義夫*; et al.

Physical Review B, 98(17), p.174415_1 - 174415_6, 2018/11


 被引用回数:2 パーセンタイル:16.65(Materials Science, Multidisciplinary)



Magnetization study on the Ising ferromagnet URhGe with high-precision angle-resolved magnetic field near the hard axis

中村 翔太*; 榊原 俊郎*; 清水 悠晴*; 橘高 俊一郎*; 河野 洋平*; 芳賀 芳範; Pospisil, J.; 山本 悦嗣

Progress in Nuclear Science and Technology (Internet), 5, p.123 - 127, 2018/11

Dc magnetization measurements have been performed on the orthorhombic Ising ferromagnet Urge. We observed a clear first-order reorientation transition with a small hysteresis and estimated the tricritical point to be around 4 K. The magnetization and the thermal expansion data indicate the presence of a characteristic temperature of about 1 K.


Application of the transient pulse method to measure clay permeability

加藤 昌治*; 奈良 禎太*; 岡崎 勇樹*; 河野 勝宣*; 佐藤 稔紀; 佐藤 努*; 高橋 学*

Materials Transactions, 59(9), p.1427 - 1432, 2018/09

 被引用回数:3 パーセンタイル:28.45(Materials Science, Multidisciplinary)


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