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Shinohara, Nobuo; Kimura, Yoshiki; Okubo, Ayako
no journal, ,
Nuclear forensics is the analysis of intercepted illicit nuclear or radioactive material and any associated material to provide evidence for nuclear attribution by determining origin, history, transit routes and purpose involving such material. Because the nuclear forensics methodologies provide hints of the origin of the nuclear materials used in illegal dealings or nuclear terrorism, it contributes to identify and indict offenders, hence to enhance deterrent effect against such terrorism. In the 59th Symposium on Radiochemistry, the results of research and development of fundamental nuclear forensics technologies (analysis of isotopic composition, impurity analysis, age dating of nuclear material, particle shape analysis by electron microscope, and nuclear forensics library) performed in Japan Atomic Energy Agency are reported. Japan's capability and the role of radiochemistry on nuclear forensics are also discussed in the Symposium.
-ray analysis at ANNRIHuang, M.; Toh, Yosuke; Ebihara, Mitsuru*; Kimura, Atsushi; Nakamura, Shoji
no journal, ,
Yasuda, Kenichiro; Suzuki, Daisuke; Kanazawa, Kazuhito; Miyamoto, Yutaka; Esaka, Fumitaka; Magara, Masaaki
no journal, ,
We are applying a screening technique with alpha spectrometry to the analysis of particles containing nuclear materials in swipe samples. In this presentation, individual plutonium particles with known purification dates prepared from a standard reference material (NBS SRM947) were measured with alpha spectrometry. The obtained 
activity ratios for the particles with the diameters of more than 1 micrometer were consistent with the reference values within the uncertainties. These results indicate that alpha spectrometry can be applied to the quantitative analysis of 
Am in individual plutonium particles.
-ray analysis of a radionuclide sampleToh, Yosuke; Huang, M.; Ebihara, Mitsuru*; Segawa, Mariko; Kimura, Atsushi; Nakamura, Shoji
no journal, ,
no abstracts in English
Sugo, Yumi; Ohshima, Yasuhiro; Yamaguchi, Aiko*; Hanaoka, Hirofumi*; Ishioka, Noriko
no journal, ,
no abstracts in English
Miyamoto, Yutaka; Yasuda, Kenichiro; Magara, Masaaki
no journal, ,
In order to analyse the environmental records of key elements including radioactive isotopes which originates from nuclear bomb tests and accidental releases from nuclear power plants, the authors accomplished the development of technique for automatic and sequential separation of less than nano grams of ultra-trace U, Th, Pb, the lanthanides, and Pu using a single anion-exchange column and mixed media consisting of highly pure acids. The separation performance of ion-exchange column was evaluated using the spikes and a reference solution, and the automatic separation system was served for the elemental and isotopic analyses of ultra-trace elements in the tree ring samples.
ray activation analysis methodHatsukawa, Yuichi; Suzuki, Shinichi; Yaita, Tsuyoshi; Paul, R.*
no journal, ,
Research on desorption mechanism of cesium ions in the clay mineral has been progress on decontamination of radioactive cesium in Fukushima. In this investigation, trace elements in clay minerals samples were determined using prompt ray activation analysis method which is very sensitive multi-elemental simultaneous determination method. The experiments carried out at the research reactor in the National Institute of Standards and Technology (NIST). 25 clay minerals samples including 6 standard samples were analyzed, and 16 elements in the samples were determined. The correlation of these elements will be discussed in the conference.
Th/
Th ratiosOkubo, Ayako; Shinohara, Nobuo; Magara, Masaaki
no journal, ,
The uranium age-dating is a nuclear forensics analysis techniques, by measuring the Th / U isotope ratio in uranium sample, to estimate the elapsed time from being separated and purified. We have determined Th and U using isotope dilution mass spectrometry method, it has conducted for uranium age-dating. Act to perform the isotope analysis after the addition a known quantity of the isotope (spike) to the sample, after spiking, analytical sample is assumed to be in the state of isotopic equilibrium. However, the samples which have complex speciation of uranium and thorium are analyzed, may not sufficiently reach to the state of isotopic equilibrium has been suggested from the experimental results. In this study, without the addition of a spike, from the measurement results of the uranium isotope ratios and thorium isotope ratio in the sample, it was investigated a method for calculating the Th / U isotope ratio. The state of radioactive equilibrium between 
U and Th in the sample was utilized in the Th / Th method. The Th / U ratio was calculated using measured Th / Th isotope ratio, U / U isotope ratio and Th / U ratio in the radioactive equilibrium.
Tomita, Jumpei
no journal, ,
no abstracts in English
Nojima, Takehiro; Fujita, Hiroki; Nagaoka, Mika; Osawa, Takahito; Yokoyama, Hiroya; Ono, Hironobu*
no journal, ,
An automatic analysis system was developed to analyze radioactive strontium (
Sr) radioactivity in environmental sample. The analysis method was followed to the manual compiled by the MEXT, to determine low level of Sr radioactivity concentration in environmental sample. In this research, the procedure of the Sr analysis before milking procedure of Y was automated except for a part of the analysis. The systems were controlled by an original program under the LabVIEW. Various kinds of ashed environmental samples were used in performance tests of the automatic system. These tests were successful without system trouble. Finally, Sr recovery was about 40-70% to whitebait analysis.
At for alpha radiotherapy via 
Bi(
Li,5n)RnNishinaka, Ichiro; Washiyama, Koshin*; Yokoyama, Akihiko*; Maeda, Eita*; Hashimoto, Kazuyuki; Makii, Hiroyuki
no journal, ,
A Rn/At generator has been proposed to supply a radiotracer At with a half-life (T
= 7.2 h) for medical applications. To establish a technology of the Rn/At generator, Rn (T = 14.7 h) has to be produced through the Bi(Li, 5n)Rn reaction without melting bismuth metal targets due to heat produced by the irradiation of 60 MeV Li ion beams. In this work, we have studied the effects of a He gas cooling system of an irradiation chamber constructed for the production of Rn. Irradiations were carried out at the JAEA tandem accelerator using the irradiation chamber equipped with the He gas cooling system. The results show that the He gas effectively cools the targets and the cooling efficiency is nearly independent of the pressure (
1 kPa) and the flow rate (
20 L/min) of the He gas.
Nagaoka, Mika; Fujita, Hiroki
no journal, ,
The radioactivities in the environmental samples are analyzed to monitor the nuclear power facilities. The pretreatment of radioactive nuclides of alpha and beta emitters in the environmental samples is performed with acid to decompose organic matter and extract object nuclide such as Sr-90, U and Pu. However, the pretreatment using acid has many problems of acid effluent and gas, corrosion of facilities and so on. Therefore, we develop to the new pretreatment method using supercritical water instead of acid. At first, we investigate the extraction yield of stable Sr and U-238 in solvent in the SCWO reaction on various situations. The yield of stable Sr was at most about 60%, while U-238 was less than 1% in this study. In the future, we try to apply a catalyst in the SCWO to increase the yield of extraction.
Takeuchi, Erina; Atarashi-Andoh, Mariko; Koarashi, Jun; Nishimura, Shusaku; Muto, Kotomi; Tsuzuki, Katsunori; Nakanishi, Takahiro; Matsunaga, Takeshi
no journal, ,
no abstracts in English
Miyashita, Yuka*; Akiyama, Kazuhiko*; Hatsukawa, Yuichi; Kubuki, Shiro*
no journal, ,
Considering about the radio pharmaceutical application of metallofullerenes, the production methods using nuclear recoil phenomena is very useful because specific radioactivity of products is higher than that obtained by other methods. Due to these advantages, this production method has been attracted and examined using various nuclear reactions so far. However, reported production yields of radioactive metallofullerenes were not enough because of the radiation damages of a targeted fullerene molecule caused by incident charged particles. One of the promising method to improve the production yield of radioactive metallofullerenes is ion implantation using the nuclear recoil induced by nuclear reaction with fast neutrons. In this study, we will report the synthesis of 
Sr endohedral fullerene using the nuclear recoil of 
Sr (n, 2n) Sr reaction with 14 MeV fast neutron produced by DT reaction. As a result, the radioactivity of Sr observed in the aniline solutions derived from Sr endohedral fullerene was estimated to be about 6.8% at the best for those before extraction. Generally, production yield of metallofullerenes by the standard arc discharge method is about 0.1% or less. Therefore, observed production yield of Sr endohedral fullerene in this study is found to be extremely efficient compared to the standard methods.
RfAsai, Masato; Tsukada, Kazuaki; Sato, Nozomi*; Sato, Tetsuya; Toyoshima, Atsushi; Ishii, Tetsuro; Miyashita, Sunao*; Kaneya, Yusuke; Shima, Yosuke*; Shibata, Michihiro*
no journal, ,
Alpha-gamma coincidence and high-resolution 
fine-structure measurements were performed for the decay of Rf. Two lines associated with the decay of Rf were clearly observed, and more precise -energy spectrum than before were obtained. It was found that the literature value (8.28 MeV) of the -transition energy of Rf was incorrect, and that the -decay scheme of Rf should contain several low-energy cascade transitions. On the basis of these results and literature data of 
Rf, we will discuss nuclear structure of superheavy nuclei around this region as well as the level structure of Rf and its daughter nucleus 
No.
Honda, Mitsunori; Shimoyama, Iwao; Kogure, Toshihiro*; Okamoto, Yoshihiro; Suzuki, Shinichi; Yaita, Tsuyoshi
no journal, ,
no abstracts in English
Kokubu, Yoko; Momoshima, Noriyuki*; Hirose, Katsumi*; Tagami, Keiko*; Takamiya, Koichi*
no journal, ,
Just after an accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP), data of radionuclides released from the FDNPP were measured for environmental samples by some researchers at individual research institute and university. However a comprehensive database including these data is not constructed now. Working group of the Japan Society of Nuclear and Radiochemical Sciences decided to construct a comprehensive database of data of the radionuclides in environmental samples. This database contains data such as sampling location, sampling method, sampling times, type of measurement system, concentrations of the radionuclides and others in the publications/reports and unpublished issues. Researchers input the data in a dedicated Excel sheet. The working group verifies and registers the data in the database, and then summarizes them in a scientific report.
Kitatsuji, Yoshihiro; Ouchi, Kazuki; Otobe, Haruyoshi
no journal, ,
Electrolytic reactions of Neptunium ions in a weakly acid solution were investigated by using gold electrode. It was reported previously that electrolytic reduction of Neptunium (V) ion based on mediator reaction with Np(III)/Np(IV) couple was observed in the acidic solution when bulk electrolysis was carried out at the potential around -0.2 V versus Ag/AgCl reference electrode. The reduction of Np(V), however, was not observed at the pH higher than 2. This is attributable to low reaction rate of electron exchange reaction between Np(V) and Np(III). Electrode reaction of Np(V) at more negative potential was investigated by cyclic voltammetry. The current peak due to reduction of Np(V) was observed at ca. -0.75 V, and oxidation current was appeared at +0.5 V. The reactions was determined to be reduction of Np(V) and oxidation of deposited species of reduction product of Np on the electrode. It was found that stripping current due to oxidation of deposit was saturated in spite of longer preelectrolysis time. This phenomenon is different from uranium.
Cu for cancer therapy with accelerator neutrons by deuteronsHashimoto, Kazuyuki; Kawabata, Masako*; Saeki, Hideya*; Sato, Shunichi*; Tsukada, Kazuaki; Hatsukawa, Yuichi; Nagai, Yasuki; Watanabe, Satoshi; Ishioka, Noriko
no journal, ,
no abstracts in English
Tc isolated from 
MoO
3 using a thermal separation techniqueKawabata, Masako*; Hashimoto, Kazuyuki; Motoishi, Shoji*; Saeki, Hideya*; Shiina, Takayuki*; Ota, Akio*; Takeuchi, Nobuhiro*; Nagai, Yasuki
no journal, ,
no abstracts in English