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Igarashi, Junya*; Ninomiya, Kazuhiko*; Zheng, J.*; Zhang, Z. J.*; Fukuda, Miho*; Aono, Tatsuo*; Minowa, Haruka*; Yoshikawa, Hideki*; Sueki, Keisuke*; Satou, Yukihiko; et al.
Environmental Science & Technology, 58(33), p.14823 - 14830, 2024/08
Times Cited Count:0 Percentile:0.00(Engineering, Environmental)Sasa, Kimikazu*; Honda, Maki; Hosoya, Seiji*; Takahashi, Tsutomu*; Takano, Kenta*; Ochiai, Yuta*; Sakaguchi, Aya*; Kurita, Saori*; Satou, Yukihiko; Sueki, Keisuke*
Journal of Nuclear Science and Technology, 58(1), p.72 - 79, 2021/01
Times Cited Count:12 Percentile:76.50(Nuclear Science & Technology)Martin, P. G.*; Jones, C. P.*; Bartlett, S.*; Ignatyev, K.*; Megson-Smith, D.*; Satou, Yukihiko; Cipiccia, S.*; Batey, D. J.*; Rau, C.*; Sueki, Keisuke*; et al.
Scientific Reports (Internet), 10, p.22056_1 - 22056_17, 2020/12
Times Cited Count:2 Percentile:10.67(Multidisciplinary Sciences)Martin, P. G.*; Jones, C. P.*; Cipiccia, S.*; Batey, D. J.*; Hallam, K. R.*; Satou, Yukihiko; Griffiths, I.*; Rau, C.*; Richards, D. A.*; Sueki, Keisuke*; et al.
Scientific Reports (Internet), 10(1), p.1636_1 - 1636_11, 2020/01
Times Cited Count:8 Percentile:30.77(Multidisciplinary Sciences)Matsunaka, Tetsuya*; Sasa, Kimikazu*; Takahashi, Tsutomu*; Matsumura, Masumi*; Satou, Yukihiko; Shen, H.*; Sueki, Keisuke*; Matsuzaki, Hiroyuki*
Radiocarbon, 61(6), p.1633 - 1642, 2019/12
Times Cited Count:2 Percentile:9.57(Geochemistry & Geophysics)Zhang, Z.*; Igarashi, Junya*; Satou, Yukihiko; Ninomiya, Kazuhiko*; Sueki, Keisuke*; Shinohara, Atsushi*
Environmental Science & Technology, 53(10), p.5868 - 5876, 2019/05
Times Cited Count:21 Percentile:59.87(Engineering, Environmental)The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident released abundant radioactive particles into the surrounding environment. Herein, we analyzed the activity of Sr in these particles to estimate the contribution of this radionuclide to the overall radiation exposure and shed light on the processes that occurred during the accident. Seven radioactive particles were isolated from the dust and soil samples collected from areas surrounding the FDNPP, and the minimum/maximum
Cs activities were determined as 224/4,100 Bq. Based on the size, specific activity, and
Cs/
Cs activity ratios, we concluded that six of the seven radioactive particles were released from the Unit 1 reactor, while one particle was released from the Unit 3 reactor by a hydrogen explosion. Strontium-90 was detected in all radioactive particles, and the minimal/maximal
Sr activities were determined as 0.046/1.4 Bq.
Cs/
Sr activity ratios above 1000 were observed for all seven particles, that is, compared to
Cs,
Sr had negligible contribution to the overall radiation exposure. The
Cs/
Sr activity ratios of the radioactive particles were similar to those of terrestrial environmental samples and were higher for particles released from the Unit 1 reactor than for samples collected from the Unit 1 reactor building, which indicates possibility of additional
Sr -rich contamination after release of the particles.
Ota, Yuki*; Sueki, Keisuke*; Sasa, Kimikazu*; Takahashi, Tsutomu*; Matsunaka, Tetsuya*; Matsumura, Masumi*; Tosaki, Yuki*; Honda, Maki*; Hosoya, Seiji*; Takano, Kenta*; et al.
JAEA-Conf 2018-002, p.99 - 102, 2019/02
no abstracts in English
Matsunaka, Tetsuya*; Sasa, Kimikazu*; Takahashi, Tsutomu*; Hosoya, Seiji*; Matsumura, Masumi*; Satou, Yukihiko; Shen, H.*; Sueki, Keisuke*
Nuclear Instruments and Methods in Physics Research B, 439, p.64 - 69, 2019/01
Times Cited Count:2 Percentile:20.71(Instruments & Instrumentation)no abstracts in English
Satou, Yukihiko; Sueki, Keisuke*; Sasa, Kimikazu*; Yoshikawa, Hideki; Nakama, Shigeo; Minowa, Haruka*; Abe, Yoshinari*; Nakai, Izumi*; Ono, Takahiro*; Adachi, Koji*; et al.
Geochemical Journal, 52(2), p.137 - 143, 2018/00
Times Cited Count:71 Percentile:96.13(Geochemistry & Geophysics)Sugiura, Hiroyuki*; Sakai, Hajime*; Satou, Yukihiko; Sueki, Keisuke*
Radioisotopes, 66(9), p.311 - 319, 2017/09
no abstracts in English
Matsunaka, Tetsuya*; Sasa, Kimikazu*; Takahashi, Tsutomu*; Hosoya, Seiji*; Matsumura, Masumi*; Sueki, Keisuke*; Satou, Yukihiko
Dai-19-Kai AMS Shimpojiumu, 2016-Nendo "Jumoku Nenrin" Kenkyukai Kyodo Kaisai Shimpojiumu Hokokushu, p.76 - 79, 2017/06
To evaluate the radiological impact of the atmospheric C discharge from the Tokai nuclear facilities, a 80-year-old Japanese pine tree from Tokai, 1.8 km south-southwest of the Tokai Nuclear Power Plants (Tokai NPP and Tokai-2 NPP) and 1.4 km North-Northwest of the Tokai Reprocessing Plant (Tokai RP), was cored and each annual ring was measured for
C. The
C specific activities varied from 232.8 Bq kg
C to 403.3Bq kg
C in the tree rings formed during the periods 1954-2013. The specific activities in 1967-2010 are significantly elevated compared with the ambient background values, clearly indicating
C discharges from the nuclear facilities during their normal operation. The excess
C activities of 0.5-70.0 Bq kg
C in 1970-2011 are positively correlated with the estimated annual
C discharges of 0.1-1.2 TBq from Tokai NPP and Tokai-2 NPP with R
of 0.66 (n = 38). These activity values of
70.0 Bq kg
C were corresponding to an additional annual effective dose of
3.9 uSv via the food ingestion pathway in the study location.
Ono, Takahiro*; Iizawa, Yushin*; Abe, Yoshinari*; Nakai, Izumi*; Terada, Yasuko*; Satou, Yukihiko; Sueki, Keisuke*; Adachi, Koji*; Igarashi, Yasuhito*
Bunseki Kagaku, 66(4), p.251 - 261, 2017/04
Times Cited Count:33 Percentile:76.66(Chemistry, Analytical)no abstracts in English
Yamasaki, Shinya*; Imoto, Jumpei*; Furuki, Genki*; Ochiai, Asumi*; Onuki, Toshihiko; Sueki, Keisuke*; Namba, Kenji*; Ewing, R. C.*; Utsunomiya, Satoshi*
Science of the Total Environment, 551-552, p.155 - 162, 2016/05
Times Cited Count:36 Percentile:71.33(Environmental Sciences)Cesium-137 (Cs) of estuary sediment impacted by the FDNPP was measured. Increasing radioactivity was observed from surface to bottom. 90% of the
Cs was strongly bound to clay minerals in the estuary sediments. These results suggest that
Cs is being transported from contaminated paddy fields to the estuary.
Morita, Kosuke*; Morimoto, Koji*; Kaji, Daiya*; Haba, Hiromitsu*; Ozeki, Kazutaka*; Kudo, Yuki*; Sumita, Takayuki*; Wakabayashi, Yasuo*; Yoneda, Akira*; Tanaka, Kengo*; et al.
Journal of the Physical Society of Japan, 81(10), p.103201_1 - 103201_4, 2012/10
Times Cited Count:178 Percentile:97.24(Physics, Multidisciplinary)An isotope of the 113th element, 113, was produced in a nuclear reaction with a
Zn beam on a
Bi target. We observed six consecutive
decays following the implantation of a heavy particle in nearly the same position in the semiconductor detector, in extremely low background condition. The fifth and sixth decays are fully consistent with the sequential decays of
Db and
Lr both in decay energies and decay times. This indicates that the present decay chain consisted of
113,
Rg (Z = 111),
Mt (Z = 109),
Bh (Z = 107),
Db (Z = 105), and
Lr (Z = 103) with firm connections. This result, together with previously reported results from 2004 and 2007, conclusively leads the unambiguous production and identification of the isotope
113, of the 113th element.
Li, Z.*; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Kikuchi, Takahiro; Nagame, Yuichiro; Schdel, M.; Pershina, V.*; et al.
Radiochimica Acta, 100(3), p.157 - 164, 2012/03
Times Cited Count:14 Percentile:69.42(Chemistry, Inorganic & Nuclear)Asai, Masato; Tsukada, Kazuaki; Haba, Hiromitsu*; Ishii, Yasuo; Ichikawa, Takatoshi*; Toyoshima, Atsushi; Ishii, Tetsuro; Nagame, Yuichiro; Nishinaka, Ichiro; Kojima, Yasuaki*; et al.
Physical Review C, 83(1), p.014315_1 - 014315_12, 2011/01
Times Cited Count:28 Percentile:81.53(Physics, Nuclear)Excited states in Fm populated via the
decay of
No are studied in detail through
-
coincidence and
fine structure measurements. Spin-parities and neutron configurations of the excited states in
Fm as well as the ground state of
No are definitely identified on the basis of deduced internal conversion coefficients, lifetimes of
transitions, rotational-band energies built on one-quasiparticle states, and hindrance factors of
transitions. It is found that the excitation energy of the 1/2
[620] state in
=151 isotones increases with the atomic number, especially at
100, while that of the 1/2
[631] state decreases at
=100. Energy systematics of the one-quasiparticle states in the
=151 isotones are discussed in terms of the evolution of nuclear deformation involving the hexadecapole and hexacontatetrapole deformations.
Toyoshima, Atsushi; Kasamatsu, Yoshitaka*; Tsukada, Kazuaki; Asai, Masato; Ishii, Yasuo; Tome, Hayato*; Nishinaka, Ichiro; Sato, Tetsuya; Nagame, Yuichiro; Schdel, M.; et al.
Journal of Nuclear and Radiochemical Sciences, 11(1), p.7 - 11, 2010/06
The extraction behavior of rutherfordium (Rf) into trioctylphosphine oxide (TOPO) from 2.0 - 7.0 M HCl solution was studied together with that of the homologues Zr and Hf. The extracted yields of Rf, Zr, and Hf increased with an increase of HCl concentration, and the sequence of their extraction was Zr Hf
Rf. It is suggested that the stability of the RfCl
2(TOPO) complex is lower than that of the corresponding species of the homologues.
Akiyama, Kazuhiko*; Haba, Hiromitsu*; Sueki, Keisuke*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Nagame, Yuichiro; Katada, Motomi*
Chemistry Letters, 38(10), p.978 - 979, 2009/09
Times Cited Count:9 Percentile:37.00(Chemistry, Multidisciplinary)We report on the successful production of a metallofullerene encapsulating the radioactive tracer Ac and on its electronic properties studied by radiochromatography. Considering the number of
-electrons on the fullerene cage estimated from an HPLC retention time on the 5PBB column and the general oxidation state of Ac (+3), a chemical species of the dominant chromatographic peak is suggested to be Ac@C
.
Haba, Hiromitsu*; Akiyama, Kazuhiko*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Yaita, Tsuyoshi; Hirata, Masaru; Sueki, Keisuke*; Nagame, Yuichiro
Bulletin of the Chemical Society of Japan, 82(6), p.698 - 703, 2009/06
Times Cited Count:10 Percentile:39.21(Chemistry, Multidisciplinary)Chloride complexation of the group-4 elements Zr and Hf in 8.0-11.9 M HCl is investigated by Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy to characterize chloro complexes of the transactinide element, rutherfordium (Rf). The complexes of Zr and Hf successively vary with the concentration of HCl from a hydrated complex [M(HO)
]
at 8.0 M to a hexachloro complex [MCl
]
at 11.9 M (M = Zr and Hf). The present structural changes of the Zr and Hf complexes well reflect the previously studied anion-exchange behavior of Zr and Hf in HCl. From both the EXAFS and anion-exchange results, we suggest that Rf forms the same complexes as those of Zr and Hf in HCl, and that the complexation strength of the hexachloro complexes of the group-4 elements, [MCl
]
(M = Zr, Hf, and Rf), is in the sequence of Rf
Zr
Hf.
Akiyama, Kazuhiko*; Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Sueki, Keisuke*; Nagame, Yuichiro; Katada, Motomi*
Journal of Radioanalytical and Nuclear Chemistry, 280(2), p.329 - 331, 2009/05
Times Cited Count:7 Percentile:43.98(Chemistry, Analytical)The properties of a metallofullerene that encapsulates Ac were studied by radio-chromatographic methods. The results of chromatography on a Buckyclutcher column suggest that there are some metallofullerene isomers of AcC
. The identical HPLC retention time of the major AcC
peak with that of La@C
indicates that the structure of one of the AcC
isomers is the same as La@C
.