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Journal Articles

Sulfate complexation of element 104, Rf, in H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution

Li, Z.*; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Kikuchi, Takahiro; Nagame, Yuichiro; Sch$"a$del, M.; Pershina, V.*; et al.

Radiochimica Acta, 100(3), p.157 - 164, 2012/03

 Times Cited Count:10 Percentile:65.97(Chemistry, Inorganic & Nuclear)

Oral presentation

Research on transportation of chemical compounds after gas phase chemistry

Murayama, Hiroshi*; Goto, Shinichi*; Kudo, Hisaaki*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Sato, Tetsuya; Nagame, Yuichiro

no journal, , 

no abstracts in English

Oral presentation

Sulfate complexation of element 104, Rf, in H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution ([H$$^{+}$$] = 1.0 M)

Li, Z.; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Kikuchi, Takahiro; Sch$"a$del, M.*; Nagame, Yuichiro; Liang, X. H.*; et al.

no journal, , 

Cation-exchange behavior of $$^{261}$$Rf (T$$_{1/2}$$ = 78 s) produced in the $$^{248}$$Cm($$^{18}$$O, 5n) reaction was studied on a "one-atom-at-a-time" scale in H$$_{2}$$SO$$_{4}$$ (0.15-0.69 M)/HNO$$_{3}$$ mixed solutions ([H$$^{+}$$] = 1.0 M) using an automated ion-exchange separation apparatus coupled with the detection system for alpha-spectroscopy. It was found that adsorption probability (%ads) of $$^{261}$$Rf on cation-exchange resin decreases with increasing [HSO$$_{4}$$$$^{-}$$], showing a successive formation of its sulfate complexes. Rf exhibited much weaker formation of the complexes than the lighter homologues Zr and Hf, which is qualitatively in good agreement with theoretical calculations including relativistic effects.

Oral presentation

Observation of new neutron-deficient actinide isotopes of $$^{234}$$Bk and $$^{230}$$Am

Kaji, Daiya*; Haba, Hiromitsu*; Kasamatsu, Yoshitaka*; Kudo, Yuki*; Morimoto, Koji*; Morita, Kosuke*; Ozeki, Kazutaka*; Sumita, Takayuki*; Yoneda, Akira*; Koura, Hiroyuki; et al.

no journal, , 

no abstracts in English

Oral presentation

Research on gas-phase chemistry for chloride of group-4 elements

Murayama, Hiroshi*; Kojima, Takayuki*; Murakami, Masashi*; Goto, Shinichi*; Kudo, Hisaaki*; Tsukada, Kazuaki; Asai, Masato; Sato, Tetsuya; Sato, Nozomi; Nagame, Yuichiro

no journal, , 

For investigation of chemical properties of superheavy element Rf, we have developed an on-line isothermal gas chromatographic apparatus. We performed to optimize experimental conditions for chemical separation and observe on-line isothermal gas chromatographic behavior of volatile chloride compounds of group-4 elements Zr and Hf. The observed overall efficiency which include transportation from a target chamber to the chemical apparatus, chemical efficiency and transportation from the apparatus to a detection site is about 10%. The isothermal gas chromatographic behavior of Zr and Hf were measured precisely.

Oral presentation

Cation-exchange behavior of element 104, Rf, in H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solution ([H$$^{+}$$] = 1.0 M)

Li, Z.; Toyoshima, Atsushi; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Sato, Nozomi; Sch$"a$del, M.*; Nagame, Yuichiro; Liang, X. H.*; Kasamatsu, Yoshitaka*; et al.

no journal, , 

Cation-exchange behavior of $$^{261}$$Rf (T$$_{1/2}$$ = 78 s) produced in the $$^{248}$$Cm($$^{18}$$O,5n) reaction was studied on a "one-atom-at-a-time" scale in 0.15-0.69 M H$$_{2}$$SO$$_{4}$$/HNO$$_{3}$$ mixed solutions ([H$$^{+}$$] = 1.0 M) using an automated ion-exchange separation apparatus coupled with a detection system for alpha-spectroscopy (AIDA). It was found that adsorption probabilities (%ads) of Rf on the cation-exchange resin decrease with increasing [HSO$$_{4}$$$$^{-}$$], showing successive formation of Rf sulfate complexes. Rf exhibits a weaker complex formation than the lighter homologues Zr and Hf.

Oral presentation

Personal monitoring for assistance staff to Fukushima

Suzuki, Takehiko; Murayama, Takashi; Miyauchi, Hideaki; Sato, Yoshitaka; Oi, Yoshihiro; Tachibana, Haruo; Yoshitomi, Hiroshi

no journal, , 

Nuclear Science Research Institute is assisting activities concerning the accident of the Fukushima No.1 Nuclear Power Station including the environmental monitoring and the resident's house decontamination, etc. In these assistance, we executing the personal monitoring to assistance staff, because there was fear of the external exposure and the internal exposure. We did by the measurement and the evaluation method of the personal monitoring in consideration of the rise of the environmental background level. We introduce the method of use to evaluate the exposed dose etc.

Oral presentation

Measurement of excitation functions of rutherfordium isotopes in $$^{248}$$Cm + $$^{18}$$O reaction

Murakami, Masashi*; Goto, Shinichi*; Murayama, Hiroshi*; Kojima, Takayuki*; Kaji, Daiya*; Morimoto, Koji*; Haba, Hiromitsu*; Sumita, Takayuki*; Sakai, Ryutaro*; Kudo, Yuki*; et al.

no journal, , 

Short-lived isomer $$^{261b}$$Rf were observed only in the decay chain of $$^{277}$$Cn or $$^{269}$$Hs, so far. In this work, we performed to confirm that the $$^{261b}$$Rf would be produced in the reaction of $$^{248}$$Cm +$$^{18}$$O simultaneously with the production of $$^{261a}$$Rf (T$$_{1/2}$$ = 68s) by using a gas-filled recoil ion separator (GARIS) at the RIKEN linear accelerator.

Oral presentation

Basic study of gas-phase chemistry using RIKEN GARIS/gas-jet system

Kojima, Takayuki*; Murayama, Hiroshi*; Murakami, Masashi*; Goto, Shinichi*; Haba, Hiromitsu*; Kaji, Daiya*; Morimoto, Koji*; Kudo, Yuki*; Morita, Kosuke*; Kikunaga, Hidetoshi*; et al.

no journal, , 

In order to study on a gas phase chemistry of rutherfordium (Rf, Z=104) by using a gas-jet system coupled with the GARIS at RIKEN, we performed to optimize experimental conditions of a isothermal gas chromatographic apparatus for chlorides of group-4 elements.

Oral presentation

R&D of MA separation processes for P&T system using ADS, 9; Examination of novel extractants for MA/RE separation

Suzuki, Hideya; Yamashita, Kiyoto*; Murayama, Rin*; Ban, Yasutoshi; Shibata, Mitsunobu; Kurosawa, Tatsuya*; Kawasaki, Tomohiro; Sagawa, Hiroshi*; Sasaki, Yuji; Matsumura, Tatsuro

no journal, , 

Hexaalkyl-nitrilotriacetamide (NTAamide) was evaluated for the separation of MA(III) and RE(III). NTAamide is a tetradentate ligand with one soft central N-donor atom and three hard carbonyl O-donor atoms in its skeleton. NTAamide was tested for the removal of MA(III) and RE(III) from HNO$$_{3}$$ into n-dodecane. MA(III) and RE(III) separation was demonstrated with a high yield through the extraction process using NTAamide. This study shows that NTAamide is a highly practical, high-performance extractant for partitioning MA(III) from RE(III).

Oral presentation

Present status of calibration fields and collaborative activities at the Facility of Radiation Standards (FRS), Japan Atomic Energy Agency (JAEA)

Kowatari, Munehiko; Yoshitomi, Hiroshi; Nishino, Sho; Tanimura, Yoshihiko; Murayama, Takashi; Oishi, Tetsuya; Yoshizawa, Michio

no journal, , 

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