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Journal Articles

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

Igarashi, Junya*; Zheng, J.*; Zhang, Z.*; Ninomiya, Kazuhiko*; Satou, Yukihiko; Fukuda, Miho*; Ni, Y.*; Aono, Tatsuo*; Shinohara, Atsushi*

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

https://doi.org/10.1038/s41598-019-48210-4
 Times Cited Count：20 Percentile：65.32(Multidisciplinary Sciences)

Radioactive particles were released into the environment during the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. Many studies have been conducted to elucidate the chemical composition of released radioactive particles in order to understand their formation process. However, whether radioactive particles contain nuclear fuel radionuclides remains to be investigated. Here, we report the first determination of Pu isotopes in radioactive particles. To determine the Pu isotopes ($$^{239}$$Pu, $$^{240}$$Pu and $$^{241}$$Pu) in radioactive particles derived from the FDNPP accident which were free from the influence of global fallout, radiochemical analysis and inductively coupled plasma-mass spectrometry measurements were conducted. Radioactive particles derived from unit 1 and unit 2 or 3 were analyzed. For the radioactive particles derived from unit 1, activities of $$^{239+240}$$Pu and $$^{241}$$Pu were (1.70-7.06)$$times$$10$$^{-5}$$ Bq and (4.10-8.10)$$times$$10$$^{-3}$$ Bq, respectively and atom ratios of $$^{240}$$Pu/$$^{239}$$Pu and $$^{241}$$Pu/$$^{239}$$Pu were 0.330-0.415 and 0.162-0.178, respectively. These ratios were consistent with the simulation results from ORIGEN code and measurements from various environmental samples. In contrast, Pu was not detected in the radioactive particles derived from unit 2 or 3. The difference in Pu contents is clear evidence towards different formation processes of radioactive particles, and detailed formation processes can be investigated from Pu analysis.

Journal Articles

Analysis of two forms of radioactive particles emitted during the early stages of the Fukushima Dai-ichi Nuclear Power Station accident

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

https://doi.org/10.2343/geochemj.2.0514
 Times Cited Count：68 Percentile：97.15(Geochemistry & Geophysics)

Journal Articles

Investigation of the chemical characteristics of individual radioactive microparticles emitted from reactor 1 by the Fukushima Daiichi Nuclear Power Plant accident by using multiple synchrotron radiation X-ray analyses

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

https://doi.org/10.2116/bunsekikagaku.66.251
 Times Cited Count：32 Percentile：79.03(Chemistry, Analytical)

no abstracts in English

Journal Articles

Mutation rate and novel ${it tt}$ mutants of ${it Arabidopsis thaliana}$ induced by carbon ions

Shikazono, Naoya; Yokota, Yukihiko*; Kitamura, Satoshi; Suzuki, Chihiro*; Watanabe, Hiroshi; Tano, Shigemitsu; Tanaka, Atsushi

Genetics, 163(4), p.1449 - 1455, 2003/04

https://doi.org/10.1093/genetics/163.4.1449

Irradiation of ${it Arabidopsis thaliana}$ by carbon ions was carried out to investigate the mutational effect of ion particles in higher plants. Frequencies of embryonic lethals and chlorophyll deficient mutants were found to be significantly higher after carbon ion-irradiation than after electron-irradiation (11-fold and 7.8-fold per unit dose, respectively). During the isolation of mutants, two new classes of flavonoid mutants (${it tt18, tt19}$) were isolated from carbon ion-mutagenized M2 plants. From PCR and sequence analysis, two of the three ${it tt18}$ mutant alleles were found to have a small deletion within the ${it LDOX}$ gene and the other was revealed to contain a rearrangement. Using the segregation rates, the mutation rate of carbon ions was estimated to be 17-fold higher than that of electrons. The isolation of novel mutants and the high mutation rate suggest that ion particles can be used as a valuable mutagen for plant genetics.

Journal Articles

Nucleotide sequence of the GLABROUSI gene of arabidopsis thaliana ecotype columbia

Shikazono, Naoya; ; Yokota, Yukihiko*; Watanabe, Hiroshi; Tano, Shigemitsu*

DNA Sequence, 9(3), p.177 - 181, 1998/00

no abstracts in English

Journal Articles

Molecular analysis of carbon ion-induced mutations in arabidopsis thaliana

Shikazono, Naoya; Yokota, Yukihiko*; ; Watanabe, Hiroshi; Tano, Shigemitsu*

Genes and Genetic Systems, 73(3), p.173 - 179, 1998/00

https://doi.org/10.1266/ggs.73.173
 Times Cited Count：29 Percentile：54.71(Biochemistry & Molecular Biology)

no abstracts in English

Journal Articles

A New arabidopsis mutant induced by ion beams affects flavonoid synthesis with spotted pigmentation in testa

; Tano, Shigemitsu*; T.Chantes*; Yokota, Yukihiko*; Shikazono, Naoya; Watanabe, Hiroshi

Genes and Genetic Systems, 72(3), p.141 - 148, 1997/06

https://doi.org/10.1266/ggs.72.141
 Times Cited Count：52 Percentile：72.97(Biochemistry & Molecular Biology)

no abstracts in English

Journal Articles

A New ${it Arabidopsis}$ mutant induced by ion beams affects flavonoid synthesis with spotted pigmentation in testa

Tanaka, Atsushi; Tano, Shigemitsu*; Chantes, T.*; Yokota, Yukihiko*; Shikazono, Naoya; Watanabe, Hiroshi

Genes and Genetic Systems, 72(3), p.141 - 148, 1997/00

https://doi.org/10.1266/ggs.72.141
 Times Cited Count：52 Percentile：72.81(Biochemistry & Molecular Biology)

no abstracts in English

Journal Articles

Effects of heavy ions on the germination and survival of arabidopsis thaliana

; Shikazono, Naoya; Yokota, Yukihiko*; Watanabe, Hiroshi; Tano, Shigemitsu*

International Journal of Radiation Biology, 72(1), p.121 - 127, 1997/00

https://doi.org/10.1080/095530097143608

no abstracts in English

Journal Articles

UV-B resistant mutations in Arabidopsis thaliana induced by ion beam irradiation

; Tano, Shigemitsu*; Watanabe, Hiroshi; Shikazono, Naoya; Yokota, Yukihiko*

Ikushugaku Zasshi, 46(SUPPL.1), 60 Pages, 1996/00

no abstracts in English

Journal Articles

Biological effects of heavy charged particles in Arabidopsis thaliana

; Yokota, Yukihiko*; Watanabe, Hiroshi; Shikazono, Naoya; Tano, Shigemitsu*

GSI-95-10, 0, p.87 - 90, 1995/00

no abstracts in English

Journal Articles

Effects of ion beams on arabidopsis thaliana(Abstract)

; Yokota, Yukihiko*; Shikazono, Naoya; Watanabe, Hiroshi; Tano, Shigemitsu*

Radiation Research 1985-1995, Congress Proc., Vol. I, 0, 445 Pages, 1995/00

no abstracts in English

Oral presentation

Emulsification technology of Aomori Hiba oil and its' antibacterial effect against staphylococci

Okabe, Toshihiro*; Ono, Hiroyuki*; Hatayama, Ichiro*; Waguri, Atsushi*; Sawada, Yuzuru*; Tsugawa, Hidehito*; Ichida, Tadao*; Nakane, Akio*; Sano, Teruo*; Tanaka, Kazuaki*; et al.

no journal, , 

Oral presentation

Design study for flow around pump shaft of Integrated IHX/pump of fast reactor JSFR, 2; Study of liquid sloshing caused by rotating pump shaft

Handa, Takuya; Enuma, Yasuhiro; Ono, Yukihiko*; Nakamura, Yuki*; Sakata, Nobuyasu*; Kushioka, Kiyonori*; Shimoji, Kuniyuki*; Inoue, Tomoyuki*; Matsumoto, Iwao*

no journal, , 

no abstracts in English

Oral presentation

Design study for flow around pump shaft of Integrated IHX/pump of fast reactor JSFR, 1; Study of pump shaft deformation by natural convection of cover gas

Enuma, Yasuhiro; Handa, Takuya; Shimazaki, Masanori*; Ono, Yukihiko*; Yoshida, Kazuhiro*; Hayakawa, Satoshi*; Inoue, Tomoyuki*

no journal, , 

no abstracts in English

Oral presentation

Magnetic phase diagrams of Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ below 2 K with CuO$$_{2}$$ ribbon chains

Fujimura, Akio*; Yasui, Yukio*; Igawa, Naoki; Yoshida, Yukihiko*; Ishigaki, Toru*; Kono, Yohei*; Kittaka, Shunichiro*; Sakakibara, Toshiro*

no journal, , 

Magnetic phase diagram was investigated by the specific heat measurement and magnetic structure has been studied by using neutron diffraction for Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ with CuO$$_{2}$$ ribbon chains. We found that this material showed antiferromagnetic transition at T$$_{N}$$ = 1.85 K under 0 magnetic field. The difference in magnetic and crystal structure between Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ and Rb$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ are discussed.

Oral presentation

Magnetic behavior and magnetic structure of CuO$$_{2}$$ ribbon system A$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ (A=Rb, Cs)

Fujimura, Akio*; Yasui, Yukio*; Kono, Yohei*; Kittaka, Shunichiro*; Sakakibara, Toshiro*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The magnetic behavior and magnetic structure of A$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ (A=Rb, Cs) with CuO$$_{2}$$ ribbon chains have been studied by using specific heat measurement and neutron diffraction method. Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ showed collinear-antiferromagnetic structure analyzed by the neutron diffraction. The relation between magnetic behavior and magnetic for those materials are discussed.

Oral presentation

Identification of plutonium isotopes in insoluble particles released by the accident of Fukushima Daiichi Nuclear Power Plant

Igarashi, Junya*; Zheng, J.*; Zhang, Z.*; Ninomiya, Kazuhiko*; Satou, Yukihiko; Fukuda, Miho*; Ni, Y.*; Aono, Tatsuo*; Shinohara, Atsushi*

no journal, , 

Plutonium is one of the most notable radionuclides in the nuclear accident. The amounts of Pu released by the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident were investigated so far. However, the existence of Pu isotopes from the global fallout makes it difficult to accurately assessment of Pu contamination by the FDNPP accident. To avoid this problem, identification of Pu contamination source from the Pu isotopic ratios is important. However, various ratios have been reported by the researches due to the contamination from global fallout. In this work, we focused on the insoluble radioactive Cs particles made of mainly SiO$$_{2}$$ (insoluble particles) released from the FDNPP to determine accurate Pu isotopic ratios. Due to its insolubility, the particles retained the original property at the time of emission from the reactor. Therefore, the insoluble particles are considered to be free from the contamination of global fallout. In addition, the amounts of Pu in the insoluble particles provide the information about their formation process in the reactor. In this study, we identified Pu isotopes in insoluble particles by radioactive analysis and ICP-MS measurement. The isotopic ratios of $$^{240}$$Pu/$$^{239}$$Pu and $$^{241}$$Pu/$$^{239}$$Pu were determined as 0.330-0.415 and 0.162-0.178, respectively and activity ratio of $$^{239+240}$$Pu/$$^{137}$$Cs was about 10$$^{-8}$$ in each particle.

18 (Records 1-18 displayed on this page)
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