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Shimada, Asako; Takahashi, Kuniaki
no journal, ,
no abstracts in English
Toyoshima, Atsushi; Asai, Masato; Attallah, M. F.*; Goto, Naoya*; Gupta, N. S.*; Haba, Hiromitsu*; Huang, M.*; Kanaya, Jumpei*; Kaneya, Yusuke; Kasamatsu, Yoshitaka*; et al.
no journal, ,
Towards electrolytic reduction of Sg, batch-wise electrolytic reduction of carrier-free 
Mo and 
W radiotracers was studied using a flow electrolytic column (FEC). The electrolyzed samples from a FEC were chemically analyzed by solvent extraction with TOA and HDEHP to separate and identify reduced species from the stable Mo(VI) and W(VI) ones based on their different extraction behavior. Mo and 
W were applied as radiotracers. We also performed cyclic voltammetry and UV/Vis absorption spectrometry of macro amounts of Mo and W in acidic solutions to obtain information on redox reactions of these elements under given conditions. In the conference, the present status of the preparatory reduction experiments with Mo and W will be presented.
Miyamoto, Yutaka; Yasuda, Kenichiro; Magara, Masaaki
no journal, ,
Trace Pu, U, Th, Pb, and lanthanides are contained in environmental samples with major elements such as Na, K and Fe. These major elements and the polyatomic ions including oxides and hydrides of the co-existing elements affect accuracy of analytical results measured by ICP-MS. The analytes, therefore, should be separated from the interfering elements. The authors developed the technique for sequential separation of Pu, U, Th, Pb, and the lanthanides using a single anion-exchange column and mixed media consisting of hydrochloric acid, nitric acid, acetic acid, and hydrofluoric acid. The target elements were completely separated and fully recovered by using our sequential separation technique.
Kaneya, Yusuke; Sato, Tetsuya; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Nagame, Yuichiro; Sch
del, M.; Sato, Nozomi; Oe, Kazuhiro*; Miyashita, Sunao*; et al.
no journal, ,
Mo/
Tc generator using high specific activity of Mo recoiled out from nanoparticle target by the 
Mo(n,2n) Mo reactionHatsukawa, Yuichi; Tsukada, Kazuaki; Hashimoto, Kazuyuki; Sato, Tetsuya; Sato, Nozomi; Asai, Masato; Toyoshima, Atsushi
no journal, ,
We proposed and propel a Mo production project via the Mo(n,2n)Mo reaction using fast neutrons from accelerator. Only low specific radioactive Mo, however, can be obtained in this method. In our project, Tc would be extracted from low specific radioactive molybdenum irradiated target, and then technetium labeled compounds from the purified Tc will be synthesized and deliver to the end user. Although labeled technetium compounds would be available, small scale technetium generator is still required in medical facilities. In this paper, feasibility study of production of high specific radioactive Mo using Szilard-Chalmers reaction from molybdenum nanoparticle target with accelerator neutron reactions was carried out. As neutron irradiation target, molybdenum nanoparticles were prepared by grinding with potassium chloride (KCl) powder, then pressed into a 10mm diameter disk. About 1.2 gram of the Mo/KCl target which contained about 100 mg molybdenum nanoparticles was irradiated with accelerator neutrons for 5 hours. After fast irradiation, the Mo/KCl target was dissolved in pure water, then solution and molybdenum nanoparticles were separated by centrifuge method. The solution contained recoiled Mo ion by fast neutron reactions was poured into alumina column. About 7% of Mo produced in the Mo/KCl target was absorbed onto the alumina column. Technetium-99m was obtained by pouring saline solution through the alumina column of immobilized Mo.
H, 
Na and 
Cs diffusion in crystalline rock under real deep geological repository conditionsHavlov
, V.*; Martin, A. J.*; Siitari-Kauppi, M.*; Tachi, Yukio
no journal, ,
The Long Term Diffusion Project (LTD) is an international project consisting of a series of experiments that aim was to obtain quantitative information on matrix diffusion under in situ conditions. In the 1st in-situ diffusion experiment, radionuclides (H, Na, Cs) were injected into the borehole in undisturbed rock matrix in Grimsel test site. The activity decrease was observed by regular sampling of the experimental solution in the system. After 800 days, the system was closed and the borehole was overcored. The active rock, surrounding the experimental interval, was then sawed and the tracer profiles were measured in the rock samples in order to determine the diffusion extent. Non sorbing H migrated up to 17 cm into the rock matrix. Na as slightly sorbing tracer migrated up to 7 cm. Finally, sorbing Cs migrated surprisingly up to 1.5 cm, instead expected several mms. The analyses results were afterwards used as a base for post mortem modelling.