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Pb reaction; Aim at the new cancer medical treatment by 
-emitting radioisotopesNishinaka, Ichiro; Makii, Hiroyuki; Toyoshima, Atsushi; Yokoyama, Akihiko*; Washiyama, Koshin*; Amano, Ryohei*; Maeda, Eita*; Yamada, Norihiro*; Taniguchi, Takumi*; Watanabe, Shigeki; et al.
no journal, ,
no abstracts in English
Nagaoka, Mika; Fujita, Hiroki; Nakano, Masanao; Watanabe, Hitoshi; Sumiya, Shuichi
no journal, ,
Monthly deposition samples were collected in the NCL which is located at about 115 km south of the Fukushima Dai-ichi NPP, and the radioactive nuclides were analyzed and measured. Although radionuclides such as 
I (T
=8.02 days), 
Te-
Te (T=33.6 days) and 
Te-I (T=3.2 days) were observed by 
spectrometry at the early time of the Fukushima Dai-ichi NPP incident, only 
Cs and 
Cs are detected now. The annual deposition of Cs and Cs were about 19,000 and 17,000 Bq/m
, respectively in March 2011 - February 2012 after the incident. 
Sr was detected in some samples with Cs concentration (100-14,000 Bq/m). Monthly Sr deposition in March 2011 was 5.1 Bq/m and then decreased after that. On the other hand, 
Pu concentration was the same level to the concentration before the incident.
Cn produced in the reaction of 
Pb+
ZnSumita, Takayuki*; Morimoto, Koji*; Kaji, Daiya*; Ozeki, Kazutaka*; Katori, Kenji*; Sakai, Ryutaro*; Hasebe, Hiroo*; Haba, Hiromitsu*; Yoneda, Akira*; Yoshida, Atsushi*; et al.
no journal, ,
The decay property of Cn (atomic number, 
) produced in the Pb(Zn, 
) reaction was studied. The experiment was performed using the gas-filled recoil ion separator (GARIS) at the RIKEN liner accelerator facility (RILAC). The Pb target with about 630 
g/cm thickness was bombarded with 347.5, 351.5, and 355.5 MeV Zn beam. At the beam energy of 351.5 MeV, we observed one -decay chain from Cn. The -particle energy of Cn was 
MeV and its lifetime was measured to be 0.370 ms. Including our previous result of the Cn production in 2004, the cross section of the Pb(Zn, ) reaction is deduced to be 
pb.
Watanabe, Shigeki; Nishinaka, Ichiro; Yamada, Keiichi*; Hashimoto, Kazuyuki; Makii, Hiroyuki; Hanaoka, Hirofumi*; Ishioka, Noriko
no journal, ,
no abstracts in English
Ishii, Yasuo; Tachi, Yukio; Yoshikawa, Hideki; Sasaki, Takayuki*; Ueda, Kenyo*
no journal, ,
In order to investigate the sorption mechanisms of trivalent europium (Eu(III)) complexes at the illite surface, the sorption experiment of Eu(III) was performed in 0.1 M NaCl in the absence and presence of dissolved carbonate and in 0.1 M NaHCO
solution by batch method. Kd value of Eu(III) in the absence of carbonate increased with increasing pH. On the other hand, in the cases where carbonate was present, there was its effect on Eu sorption. In the presence of dissolved carbonate, Kd values didn't increased in a higher pH region. In 0.1 M NaHCO solution, Kd values decreased with increasing pH at pH
8, caused by the change of carbonate complexation of Eu(III). In the symposium, we will discuss a future subjects including mechanistic modeling and spectroscopic evaluation of surface chemical species based on a TRLFS experiment.
Miyashita, Sunao; Toyoshima, Atsushi; Oe, Kazuhiro; Asai, Masato; Sato, Tetsuya; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; Nagame, Yuichiro; Sch
del, M.; Omtvedt, J. P.*; et al.
no journal, ,
For determination of the redox potentials of seaborgium (Sg), we plan to carry out rapid continuous experiments using a new system combined with a flow electrolytic column and the rapid liquid-liquid extraction apparatus SISAK. For the experiments of redox potentials of Sg, fast separation between different oxidation states of Sg is required. In this study, solvent extraction of W and Mo, as the lighter homologues of Sg, from 0.10 mol/L hydrochloric acid solution into di-(2-ethylhexyl)phosphoric acid (HDEHP), 1-phenyl-3-metyl-4-benzoyl-5-pyrazolone (PMBP) and 3-isopropyl-tropolone (HT) in toluene was investigated. A synergistic effect by tributylphosphate (TBP) was also examined.
Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Sato, Tetsuya; Nagame, Yuichiro; Sato, Nozomi; Ishii, Tetsuro; Kasamatsu, Yoshitaka*
no journal, ,
The first excited-state energies E(2
) in the even-even actinide nuclei 
Pu, 
Cm, 
Cf, and 
Fm were determined for the first time by means of a high-resolution energy measurement and an - coincidence measurement. The -decay parents of these nuclei were produced with the JAEA Tandem Accelerator, and their decays were measured with a rotating-wheel (-) detection system coupled with a gas-jet transport technique. From the energy difference between transitions to the ground state and to the first excited state, E(2) was determined with uncertainties of less than 0.5 keV. It was found that the E(2) takes the minimum around Cm and Cf isotopes, and then, increases with the atomic number. This trend is reasonably explained as a decreasing deformation towards the Z 
114 spherical closed shell. In addition, the E(2) shows the local minimum at 
Fm, indicating the existence of the doubly deformed shell gaps at Z = 100 and N = 152.
-ray measurement technique for single plutonium particlesYasuda, Kenichiro; Suzuki, Daisuke; Esaka, Fumitaka; Magara, Masaaki; Kimura, Takaumi
no journal, ,
In the safeguards environmental sampling, isotope ratios of nuclear materials in individual particles gives useful information to reveal undeclared nuclear activities. Various analytical techniques have been developed for isotope ratio analysis of single particles. We developed analytical technique which is a combination of a SEM/EDX for detection of particle containing nuclear material and a TIMS for its isotope ratio analysis. In this research, we developed the method which can estimate amount of Pu in a single particle by -ray measurement. -ray from the particle was measured by an -ray spectrometer before the isotope analysis by TIMS. -ray spectra of the Pu particles with diameters from 0.6 to 1.9 m were measured. Except for a particle with a diameter of 1.9 m, -ray peaks of 
Pu and 
Pu were completely separated and measured each other.
Torigata, Kazufumi*; Honda, Teruyuki*; Iwatsuki, Teruki; Murakami, Hiroaki
no journal, ,
no abstracts in English
Sato, Tetsuya; Sato, Nozomi; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Oe, Kazuhiro; Miyashita, Sunao; Nagame, Yuichiro; Schdel, M.; Osa, Akihiko; et al.
no journal, ,
In order to determine the IP of lawrencium (Lr, Z = 103) by a surface ionization technique, we have developed a thermal ion source coupled to a gas-jet transport system for an Isotope Separator On-Line (ISOL) at the JAEA tandem accelerator facility. We measured ionization efficiencies of the short-lived Lr isotope, 
Lr (
= 27 s), and the Lu isotope, 
Lu ( = 3.1 min), using the ion source. The mass-separated Lr ions were successfully observed. Ionization efficiencies on the Re surface at 2600 K of Lr and Lu were evaluated to be 42% and 20%, respectively. Those experimental results suggests that the ionization potential of Lr could be lower than that of Lu as expected from theoretical calculation.
Tomitsuka, Tomohiro*; Kojima, Takayuki*; Murakami, Masashi*; Goto, Shinichi*; Sato, Tetsuya; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Oe, Kazuhiro; Nagame, Yuichiro; et al.
no journal, ,
In order to study on chemical properties of superheavy element, rutherfordium (Rf, Z=104), we have investigated gas chromatographic behavior of group 4 elements by using an online gas chromatographic technique. Assuming that the gas chromatographic behavior can be described by a typical adsorption-desorption model, an adsorption enthalpy of chemical species of interest on a column surface can be deduced only by comparing the gas chromatographic behavior of isotopes with different half-lives. In this work, we compared gas chromatographic behavior of the short-lived Hf isotopes, 
Hf ( = 78 s), 
Hf ( = 406 s) and 
Hf ( = 123 s). The difference between Hf and Hf was smaller than that expected from the simple adsorption-desorption model. This result suggests a different process can be expected from the model of adsorption and desorption behavior.
Kaneya, Yusuke*; Sato, Tetsuya; Sonoda, Nozomi; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Oe, Kazuhiro; Miyashita, Sunao; Nagame, Yuichiro; Schdel, M.; et al.
no journal, ,
In order to determine the first ionization energy of lawrencium (Lr, 
= 103), we have developed a new surface ionization ion source coupled to a gas-jet transport system in ISOL (Isotopes Separator On-Line) at the JAEA tandem accelerator facility. On-line experiments with short-lived lanthanide isotopes using the new ion-source were performed. It would be confirmed that the ionization energy of lanthanide which boiling point is up to 3000
C can be determined.
Toyoshima, Atsushi; Miyashita, Sunao; Oe, Kazuhiro; Asai, Masato; Sato, Tetsuya; Tsukada, Kazuaki; Kitatsuji, Yoshihiro; Nagame, Yuichiro; Schdel, M.; Omtvedt, J. P.*; et al.
no journal, ,
We plan to determine the redox potential of seaborgium (Sg) in continuous experiments with a flow electrolytic column and a continuous solvent extraction SISAK. In this study, reduction experiments of its lighter homologues, Mo and W, were performed using the flow electrolytic column apparatus. After 200 L of the 
W radiotracer in 0.1 M HCl was introduced into the apparatus, 1000 L of 0.1 M HCl was fed into the electrode on which an potential was applied between -0.8 and 0.6 V. 1000 L was taken from the effluent from the electrode and was then mixed with 10
M hinokitiol in toluene with the same volume. After shaking for 1 min and then centrifuging for 30 s, 800 L was taken from each phase, which was then separately subjected to -ray spectrometry. As a result, the extraction yield of W was constant against the variation of the applied potential. It seems that once reduced W was again oxidized to the +6 state in the extraction procedure.
Miyamoto, Yutaka; Suzuki, Daisuke; Magara, Masaaki; Esaka, Fumitaka; Kimura, Takaumi
no journal, ,
The analytical technique for accurate determination of Pu purification age in a Pu oxide particle was developed. The accuracy and uncertainty of age determined by our analytical technique was evaluated with the 8 Pu oxide particles which the Pu purification age (3.915 years) is known. An anion-exchange column with nitric acid media was used for the separation of 
Pu and its progeny nuclide, Am. The elemental and isotope ratios of Pu and Am were measured with an HR-ICP-MS (ELEMENT) equipped with a desolvation sample introduction system (APEX-Q). The 
Am-spike method gave accurate (the measured ages agreed with the actual age within k=1 uncertainty) and precise results (range of uncertainty: 0.3 years)
Miyamoto, Yutaka; Yasuda, Kenichiro; Magara, Masaaki; Kimura, Takaumi
no journal, ,
The airborne dust samples were collected in March and May 2011 with an Andersen-type low pressure cascade impactor, and the radioactivities collected on each sampling stage were measured with a HP-Ge spectrometer. The airborne dust collected in the May had two different AMAD of Cs-137. This seasonal change of Cs-137 AMAD suggests that the host phase of Cs-137 and transport mechanism may be different from those in the March.
Oe, Kazuhiro; Tsukada, Kazuaki; Asai, Masato; Sato, Tetsuya; Toyoshima, Atsushi; Miyashita, Sunao; Nagame, Yuichiro; Schdel, M.; Kaneya, Yusuke*; Lerum, H. V.*; et al.
no journal, ,
We are planning to investigate the redox potentials of element 106, seaborgium, with a combination of the rapid liquid-liquid extraction apparatus SISAK and a flow electrolytic column. In order to combine these two apparatuses, we need to reduce the liquid flow-rate of the SISAK system. In this study, a new degasser, which works with a lower flow rate, was developed for SISAK. It separates the gas-liquid mixture using a hydrophobic Teflon membrane (only the gas can go through the membrane). Using this new degasser, dissolution efficiencies of gas-jet transported products were measured. At the typical flow rate for the SISAK system (0.4 mL/s), a dissolution efficiency of approximately 80% was obtained. A high yield of around 80% was also observed at a flow rate of 0.1 mL/s with a mixer for the gas-liquid mixing.
Toda, Kosuke*; Ueno, Shingo*; Takahashi, Naruto*; Kasamatsu, Yoshitaka*; Yokokita, Takuya*; Oe, Kazuhiro; Yokoyama, Akihiko*
no journal, ,
In order to study the effect of the degree of deformation on the fusion reaction, we have researched for the fusion reaction of Lu + 
O and Ho + 
Ne. In the systems, the projectile nucleus O is spherical, while Ne is deformed. Thus they are fusion reactions of deformed-spherical nuclei and deformed-deformed nuclei, respectively. Besides, latter system has the same compound nucleus, 
Ir, as the 
Tm + O reaction in previous work. The evaporation residue cross sections were measured by using a stack technique and a gas-jet technique for the projectile energies of 50 to 155 MeV. The cross sections were compared with the theoretical values calculated by HIVAP code. The measured excitation functions were found to agree fairly well with theoretical values. The results are consistent with the idea that the degree of deformation makes an effect on the rising edge of excitation functions near the Coulomb barrier.
Oyaizu, Makoto; Isobe, Kanetsugu; Yamanishi, Toshihiko
no journal, ,
It was expected that tritium and/or its radiolysis products would affect the corrosion behavior of materials. Therefore, the effects of tritium on corrosion behavior of SUS304 stainless steel was studied by electrochemical techniques of the anodic polarization measurements, the catholic polarization measurements for Tafel polarization method, and the open circuit potential measurements. As the results, the passivation was inhibited by tritium, and this effect became more significant and intensive as tritium concentration increased. The corrosion rate was soundly increased by this effect. Additionally, the corrosion rate was also increased as tritium concentration increased when dissolved oxygen existed. From these result, it was considered that the passivation inhibitory effect by tritium would be proceeded by highly oxidative radiolysis products such as hydroxyl radical, which could oxidize the precursor(s) and/or constituents of passive layer not to be passivated.
Kitatsuji, Yoshihiro; Magara, Masaaki; Kimura, Takaumi; Kihara, Sorin*
no journal, ,
no abstracts in English
Naganawa, Hirochika
no journal, ,
no abstracts in English