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Journal Articles

Anion-exchange behavior of Nb, Ta, and Pa as homologues of Db in HF/HNO$$_{3}$$ solutions

Kasamatsu, Yoshitaka; Toyoshima, Atsushi; Tome, Hayato; Tsukada, Kazuaki; Haba, Hiromitsu*; Nagame, Yuichiro

Journal of Nuclear and Radiochemical Sciences, 8(2), p.69 - 72, 2007/10

https://doi.org/10.14494/jnrs2000.8.69

We investigated anion-exchange behavior of Nb, Ta and Pa in HF/HNO$$_{3}$$ media to find suitable experimental conditions for the study of the Db fluoride complex formation. We measured Kd values of Nb, Ta and Pa on strong basic anion exchangers in the wide range of the fluoride ion concentration, 1$$times$$10$$^{-6}$$$$sim$$2$$times$$10$$^{-2}$$M, in order to in detail investigate anionic fluoride complex formation of those elements. We have used tracer concentrations of isotopes of $$^{95}$$Nb, $$^{179}$$Ta and $$^{233}$$Pa in the experiments. Variation of the Kd values as a function of [NO$$_{3}$$$$^{-}$$] was also studied. As a result, we observed an apparent difference in the adsorption behavior of the homologues. Based on these results together with the measurement of the equilibrium time, we propose rapid online experimental condition for the study of Db fluoride.

Journal Articles

Synthesis of endohedral $$^{133}$$Xe-fullerenol by using higher fullerene

Watanabe, Satoshi; Katabuchi, Tatsuya*; Ishioka, Noriko; Matsuhashi, Shimpei

Journal of Nuclear and Radiochemical Sciences, 8(2), p.105 - 107, 2007/10

https://doi.org/10.14494/jnrs2000.8.105

Journal Articles

Protein expression of ${it Saccharomyces cerevisiae}$ in response to uranium exposure

Sakamoto, Fuminori; Nankawa, Takuya; Kozai, Naofumi; Fujii, Tsutomu*; Iefuji, Haruyuki*; Francis, A. J.; Onuki, Toshihiko

Journal of Nuclear and Radiochemical Sciences, 8(2), p.133 - 136, 2007/10

https://doi.org/10.14494/jnrs2000.8.133

Protein expression of ${it Saccharomyces cerevisiae}$ grown in the medium containing $$^{238}$$U(VI) and $$^{233}$$U(VI) was examined by two-dimensional gel electrophoresis. ${it S. cerevisiae}$ of BY4743 was grown in medium containing $$^{238}$$U of 0, 2.0, and 5.0 $$times$$ 10$$^{-4}$$ M or $$^{233}$$U of 2.5 $$times$$ 10$$^{-6}$$ (radioactivity was higher by 350 times than 2.0 $$times$$ 10$$^{-4}$$ M $$^{238}$$U) and 5.0 $$times$$ 10$$^{-6}$$ M for 112 h at 30$$^{circ}$$C. The growths of the yeast grown in the above media were in the following order: control $$>$$ 2.5 $$times$$ 10$$^{-6}$$ M $$^{233}$$U $$>$$ 2.0 $$times$$ 10$$^{-4}$$ M $$^{238}$$U $$>$$ 5.0 $$times$$ 10$$^{-6}$$ M $$^{233}$$U $$>$$ 5.0 $$times$$ 10$$^{-4}$$ M $$^{238}$$U. This result indicated that not only radiological but also chemical effect of U reduced the growth of the yeast. The concentrations of U in the medium containing $$^{238}$$U or $$^{233}$$U decreased, suggesting U accumulation by the yeast cells. The 2-D gel electrophoresis analysis showed the appearance of several spots after exposure to $$^{238}$$U or to $$^{233}$$U but not in the control containing no uranium. These results show that the yeast cells exposed to U express several specific proteins.

Journal Articles

Microbial transformations of plutonium

Francis, A. J.; Dodge, C. J.*; Onuki, Toshihiko

Journal of Nuclear and Radiochemical Sciences, 8(2), p.121 - 126, 2007/10

https://doi.org/10.14494/jnrs2000.8.121

We investigated the biotransformation of Pu(IV)-citrate by ${it Pseudomonas fluorescens}$ under aerobic conditions. Citric acid was rapidly metabolized by ${it P. fluorescens}$ resulting in the formation of Pu polymer. Addition of Pu(VI) to a mixture consisting of bacterial cells and kaolinite clay showed that the Pu was preferentially associated with bacterial cells as Pu(IV) and that Pu(VI) was reduced to Pu(V) and Pu(IV) only in the presence of bacteria.

Journal Articles

Measurement of evaporation residue and fission cross sections of the reaction $$^{30}$$Si + $$^{238}$$U at subbarrier energies

Nishio, Katsuhisa; Hofmann, S.*; Ikezoe, Hiroshi; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; et al.

Journal of Nuclear and Radiochemical Sciences, 8(2), p.73 - 78, 2007/10

https://doi.org/10.14494/jnrs2000.8.73

Oral presentation

Co-precipitation reaction for Ba and Ra into calcite

Yoshida, Yasushi*; Yoshikawa, Hideki; Nakazawa, Toshiyuki*; Sato, Tomofumi*

no journal, , 

To evaluate incorporation behavior of Me$$^{2+}$$ larger than Ca in ion radius, co-precipitation experiment were implemented. Partition coefficient is generally used to estimate co-precipitation reaction and this parameter is reported to be affected by precipitation rate of calcite. Therefore, under the condition of variety of R, D for Me$$^{2+}$$ larger than Ca into calcite was measured. For trace elements Ra and Ba were used. As a result of experiment Partition coefficient for Ba (or Ra) are decreasing toward the slow R. This tendency is consistent with the reported data. The values of D of Ba and Ra which are low imply those large radius elements are difficult to incorporated into crystal lattice and inclusion is presumably induced by distortion of lattice structure. In addition there is no notable difference of D for Ra and Ba despite difference of radius length. It indicates an extent of inclusion does not depend on a difference of ion radius between Ra and Ba.

Oral presentation

Correlation between fission and $$alpha$$-particle emission in the $$^{18}$$O + $$^{244}$$Pu reaction

Nishinaka, Ichiro; Tanikawa, Masashi*; Nagame, Yuichiro; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Ichikawa, Takatoshi*

no journal, , 

no abstracts in English

Oral presentation

Development of ion source for JAEA-ISOL, 2

Sato, Tetsuya; Osa, Akihiko; Asai, Masato; Tsukada, Kazuaki; Ichikawa, Shinichi

no journal, , 

no abstracts in English

Oral presentation

Systematical properties of spontaneous fission for superheavy nuclei and a limit of existence of nuclei

Koura, Hiroyuki; Chiba, Satoshi

no journal, , 

We present potential energy surfaces and partial half-lives of spontaneous fission with the use of the KTUY nuclear mass formula in the heavy- and super heavy nuclidic region. In this framework the deformed liquid-drop energy is calculated in the six-dimensional numerical integrals instead of the previous calculation by using an explicit form of the Legendre expansion with respect to deformation parameters. This improvement gives us capable to calculate nuclear shell energies in the wider deformation space from the ground-state shape to the nuclear fission. The theoretical spontaneous-fission half-lives in this calculation gives an upper limit of the proton number Z for nuclei with total half-lives of 1 nanosecond or more in the super heavy region around N=184, approximately Z=130-136. The predicted upper limit of Z for nuclei with those of 1 second is approximately Z=115. The border of existence of nuclei in the neutron-poor region is given not by the limit of proton emission, but by that of spontaneous fission.

Oral presentation

Chemical studies of the transactinide elements at JAEA

Tsukada, Kazuaki

no journal, , 

no abstracts in English

Oral presentation

Chloride complex formation of Rf in HCl and CH$$_{3}$$OH mixed solution

Tsukada, Kazuaki; Toyoshima, Atsushi; Haba, Hiromitsu*; Asai, Masato; Akiyama, Kazuhiko*; Ishii, Yasuo; Tome, Hayato; Nishinaka, Ichiro; Sato, Tetsuya; Ichikawa, Shinichi; et al.

no journal, , 

no abstracts in English

Oral presentation

TOPO reversed-phase extraction behavior of rutherfordium in HCl solutions

Toyoshima, Atsushi; Kasamatsu, Yoshitaka; Tsukada, Kazuaki; Haba, Hiromitsu*; Asai, Masato; Ishii, Yasuo; Tome, Hayato; Sato, Tetsuya; Nishinaka, Ichiro; Nagame, Yuichiro; et al.

no journal, , 

no abstracts in English

Oral presentation

Status of JAEA-KEK radioactive ion beam facility, TRIAC

Osa, Akihiko

no journal, , 

no abstracts in English

Oral presentation

Simultaneous production of highly-pure $$^{76,77}$$Br and $$^{79}$$Kr using an isotope separator

Ishioka, Noriko; Fateh, B.*; Watanabe, Satoshi; Sekine, Toshiaki*; Kume, Tamikazu

no journal, , 

14 (Records 1-14 displayed on this page)
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