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Journal Articles

Effect of Am addition on oxygen potential in (U$$_{0.55}$$Pu$$_{0.3}$$Am$$_{0.15}$$)O$$_{2-x}$$

Yokoyama, Keisuke; Watanabe, Masashi; Usui, Akane; Seki, Takayuki*; Onishi, Takashi; Kato, Masato

Nuclear Materials and Energy (Internet), 42, p.101908_1 - 101908_6, 2025/03

https://doi.org/10.1016/j.nme.2025.101908
 Times Cited Count：0

Oxygen potential of high Am content MOX, (U$$_{0.55}$$Pu$$_{0.3}$$Am$$_{0.15}$$)O$$_{2-x}$$, was measured at 1273 K, 1473 K, 1573 K, and 1623 K. by gas equilibrium method using thermogravimeter. Comparing the measured data with the literature data, it was found that the addition of 15% Am increases the oxygen potential of (U, Pu)O$$_{2.00}$$ by 100-150 kJ/mol for the same Pu content and O/M ratio. The proportion of cations in the stoichiometric composition was determined as (U$$^{4+}_{0.4}$$U$$^{5+}_{0.15}$$Pu$$^{4+}_{0.3}$$Am$$^{3+}_{0.15}$$)O$$_{2.00}$$, assuming the presence of Am$$^{3+}$$ and partial oxidation of U$$^{4+}$$ to U$$^{5+}$$. The relationship between oxygen partial pressure and deviation x from stoichiometry in (U$$_{0.55}$$Pu$$_{0.3}$$Am$$_{0.15}$$)O$$_{2-x}$$ was analyzed by defect chemistry model. The equation to represent the O/M ratio was derived as a function of temperature and oxygen partial pressure. A part of this study includes the results of MEXT Innovative Nuclear Research and Development Program Grant Number JPMXD0219214921.

Journal Articles

Control of the size of etchable ion tracks in PVDF; Irradiation in an oxygen atmosphere and with fullerene C$$_{60}$$

Kitamura, Akane; Yamaki, Tetsuya*; Yuri, Yosuke*; Koshikawa, Hiroshi*; Sawada, Shinichi*; Yuyama, Takahiro*; Usui, Aya; Chiba, Atsuya*

Nuclear Instruments and Methods in Physics Research B, 460, p.254 - 258, 2019/12

https://doi.org/10.1016/j.nimb.2019.06.030
 Times Cited Count：2 Percentile：20.71(Instruments & Instrumentation)

Poly(vinylidene-fluoride) (PVDF) film is suitable for investigation of the size of etchable ion tracks because we can clearly judge the finish of the track etching and the surrounding bulk area remains due to the high chemical stability. Thereby we can measure the radius of ion tracks of each ion. In this study, we focused on two irradiation conditions for controlling the size of etchable ion tracks of PVDF films. One was irradiation in an oxygen atmosphere and the other was a fullerene (C$$_{60}$$$$^{+}$$) cluster beam irradiation. SEM observation showed that the size of pores became larger by irradiation in an oxygen atmosphere. It was found that the oxidation of ion tracks widened the size of etchable ion tracks. The C$$_{60}$$$$^{+}$$ irradiation caused larger etchable tracks on the PVDF surface. The result could represent the effect of local and simultaneous collisions by the swift aggregated ions.

Journal Articles

Ion track etching of PVDF films irradiated with fast C$$_{60}$$$$^{+}$$ cluster ions

Kitamura, Akane; Yamaki, Tetsuya*; Chiba, Atsuya*; Usui, Aya

QST-M-8; QST Takasaki Annual Report 2016, P. 37, 2018/03

https://repo.qst.go.jp/records/73811

We investigated the track-etched surface of PVDF films irradiated with C$$_{60}$$$$^{+}$$ cluster ions, comparing the data with C$$^{+}$$ monoatomic ions. PVDF films were irradiated with 6 MeV C$$_{60}$$$$^{+}$$ cluster ions. The energy of the each carbon ion is 100 keV/atom; thus, for comparison, the PVDF films were also irradiated with 100 keV C$$^{+}$$ ions. SEM and AFM observation showed that the surface irradiated with C$$_{60}$$$$^{+}$$ cluster ions apparently possessed flat-bottomed pores with an average diameter and depth of approximately 400 and 250 nm, respectively. On the other hand, track-etched pores were also formed on the surface irradiated with C$$^{+}$$ ions, but their morphology was irregular or obscure. In the irradiation with the C$$_{60}$$$$^{+}$$ cluster ions, the surface diameter of track-etched pores increased with increasing the etching time. The tracks of the 100 keV C$$^{+}$$ ions seemed to be hardly developed by the etching when the time. In conclusion, the C$$_{60}$$$$^{+}$$ cluster ions irradiation caused a large size of etchable tracks on the PVDF surface. The result could represent the effect of local and simultaneous collision by the aggregated ions.

Journal Articles

Current status of electrostatic accelerator at TIARA

Usui, Aya; Chiba, Atsuya; Yamada, Keisuke; Yokoyama, Akihito; Kitano, Toshihiko*; Takayama, Terumitsu*; Orimo, Takao*; Kanai, Shinji*; Aoki, Yuki*; Hashizume, Masashi*; et al.

Dai-28-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.117 - 119, 2015/12

no abstracts in English

Journal Articles

Present status of TIARA at JAEA

Yuyama, Takahiro; Ishibori, Ikuo; Kurashima, Satoshi; Yoshida, Kenichi; Ishizaka, Tomohisa; Chiba, Atsuya; Yamada, Keisuke; Yokoyama, Akihito; Usui, Aya; Miyawaki, Nobumasa; et al.

Proceedings of 12th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.302 - 304, 2015/09

http://www.pasj.jp/web_publish/pasj2015/proceedings/PDF/FSP0/FSP010.pdf

no abstracts in English

Oral presentation

Development of the sintering solidification method for spent zeolite to long-term stabilization, 4; Phase relation in heat treatment of Cs saturated adsorption zeolite

Usui, Akane; Tanaka, Kosuke; Onishi, Takashi

no journal, , 

Development of the sintering solidification method for spent zeolite has been conducted. In order to understand the basic knowledge for the formation of pollucite, phase relation in heat treatment of Cs saturated adsorption zeolite was evaluated.

Oral presentation

Study for solidified products preparation conditions in sintering solidification technique of chabazite type zeolites

Naito, Ryo*; Kato, Fumihiro*; Arai, Tsuyoshi*; Usui, Akane; Onishi, Takashi; Tanaka, Kosuke; Matsukura, Minoru*; Mimura, Hitoshi*

no journal, , 

no abstracts in English

Oral presentation

$$alpha$$-emitting nuclides analysis of the stagnant water including sediments in Fukushima Daiichi NPS, 3; Chemical state analysis of $$alpha$$-emitting nuclide particles obtained from unit #3 stagnant water sludge

Usui, Akane; Yamaguchi, Yukako; Sekio, Yoshihiro; Maeda, Koji; Koma, Yoshikazu; Konno, Katsuhiro*

no journal, , 

no abstracts in English

Oral presentation

$$alpha$$-emitting nuclides analysis of the stagnant water including sediments in Fukushima Daiichi NPS, 6; Chemical state analysis of $$alpha$$-emitting nuclide particles obtained from unit #3 stagnant water sludge (Part 2)

Nitta, Asahi; Usui, Akane; Yamaguchi, Yukako; Sekio, Yoshihiro; Maeda, Koji; Koma, Yoshikazu; Konno, Katsuhiro*

no journal, , 

no abstracts in English

Oral presentation

$$alpha$$-emitting nuclides analysis of the stagnant water including sediments in Fukushima Daiichi NPS, 10; Chemical state analysis of $$alpha$$-emitting nuclide particles obtained from stagnant water sludge sampled from Unit #1 and centralized radioactive waste treatment facility

Toyota, Chihiro; Nitta, Asahi; Usui, Akane; Sekio, Yoshihiro; Maeda, Koji; Koma, Yoshikazu; Konno, Katsuhiro*

no journal, , 

no abstracts in English

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