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Yamaguchi, Akiko; Nagata, Kojiro*; Tanaka, Kazuya; Kobayashi, Keita; Okumura, Masahiko; Kobayashi, Toru; Shimojo, Kojiro; Tanida, Hajime; Sekiguchi, Tetsuhiro; Kaneta, Yui; et al.
no journal, ,
no abstracts in English
in bones with Y separation by DGA resinKoarai, Kazuma; Matsueda, Makoto; Aoki, Jo; Fujiwara, Kenso; Terashima, Motoki
no journal, ,
Chemical separation with DGA resin can remove interference radionuclides (Cs, Pb, Bi, Th, and U) and bone matrix (Na, Mg, K, Sr, and Ba) from Y in bones. The developed method is adequate to Sr analysis for standard material of bone.
Aoki, Jo; Matsueda, Makoto; Koarai, Kazuma; Terashima, Motoki
no journal, ,
In this study, we confirmed that interfering elements and coexisting anions have no effect on sorption of I to silver ion supported resin. The developed method was found to be able to enrich very low concentrations of 
I to the target level for seawater analysis by ICP-MS.
Tsukada, Kazuaki; Hashimoto, Kazuyuki*; Hashimoto, Shintaro; Asai, Masato; Hatsukawa, Yuichi*; Saeki, Hideya*; Kawabata, Masako*; Ota, Akio*; Motomura, Arata*
no journal, ,
no abstracts in English
Morii, Shiori; Yomogida, Takumi; Ouchi, Kazuki; Kitatsuji, Yoshihiro
no journal, ,
Zr-93 is one of the long-lived fission products in radioactive waste. To ensure the long-term safety of radioactive waste, estimating the risks associated with radiation from Zr-93 is essential. In previous studies, determination methods of Zr-isotope in liquid sample using ICP-MS were developed. However, those methods were complicated and time consuming. Then, this research is developing the new method that determining Zr-isotope in solid sample using LA-ICP-MS. Sr, Mo, Ru are needed to separate from Zr, because those elements are isobars and interfere the quantitative of Zr. DGA resin was used to separate Zr from simulated HLW solution. Diluted simulated HLW solution was loaded onto the DGA resin cartridge. 2 M nitric acid and 4 M nitric acid were loaded onto the resin and interference elements were eluted from the resin. After nitric acid was loaded, more than 99% of Zr was retained on the resin. Thus, this method enables preparing solid Zr sample for determination of Zr-isotope.
Yomogida, Takumi; Kitatsuji, Yoshihiro; Takahashi, Yoshio*; Miyamoto, Yutaka
no journal, ,
In the decommissioning of the FDNPP, there is a concern about the release of fine particles containing uranium (U) into the environment. Since the solubility of U in water varies greatly depending on its chemical species, it is inevitable to understand the chemical species of U fine particles. Uranium dioxide (UO
) is oxidized to a non-stoichiometric compound (UO
) by air oxidation. In this study, we developed a method to discriminate the chemical species of the bulk of microparticles by transmission X-ray absorption spectroscopy and of the surface of microparticles by micro-Raman spectroscopy. Aged UO particles were used as a model compound. By analyzing the X-ray absorption spectra, it was found that UO and U
O
were present in about 90% and 10% of the fine particles, respectively. In the Raman spectra, the Raman peaks derived from the structure of UO
nHO were observed, suggesting that the main chemical species are different between the surface and the bulk of the particles.
Tomita, Ryohei; Tomita, Jumpei; Yomogida, Takumi; Suzuki, Daisuke; Yasuda, Kenichiro; Esaka, Fumitaka; Miyamoto, Yutaka
no journal, ,
Secondary ion mass spectrometry (SIMS) analysis of uranium particles for safeguards purpose consists of Automated Particle Measurement (APM) and Microprobe analysis. APM for safeguards sample includes 2400 measurements, each field is analyzed for short time. So, if a sample have particles which generate too much uranium hydride formation on their surface, the APM result, especially 
U abundance, is affected by uranium hydride formation. It causes inaccurate APM result. To investigate what percentage of the entire particle the particle surface causing ratio change account for, total evaporation measurement was implemented for standard uranium particle generating much uranium hydride formation on their surface and uranium isotopic ratio change during the total evaporation measurement was observed. Total evaporation experiment indicated that the number of secondary ions originated from particle surface accounted for 3.1% of all of number of ions sputtered from the entire particle. Based on the total evaporation result, APM conditions, primary beam intensity, measurement time and raster size, combined with the method manipulating particles under scanning electron microscope were optimized to reduce the hydride effect for APM result.
Tomita, Jumpei; Tomita, Ryohei; Suzuki, Daisuke; Yasuda, Kenichiro; Miyamoto, Yutaka
no journal, ,
Formation of polyatomic interferences made of an atom of heavy element and atoms in plasma such as argon and oxygen is known to create problems for their measurements using ICP-MS. In this study, quantitative assessment of polyatomic interferences for the measurement of U and Pu isotope ratios at ultra-trace level using MC-ICP-MS was conducted. For U isotopes, significant polyatomic interferences caused by 
Ir
Ar, 
PtAr and 
PtAr were observed at the mass of 233, 234 and 236, respectively. When 1 ppb of natural uranium solution (IRMM184) containing 0.4 ppb of Pt was measured, 
U/
U isotope ratio was roughly estimated to be two-fold higher than certified value due to the interference. For Pu isotopes, small interference from Pb (
PbAr) was observed at the mass of 244 while other obvious interferences were not found.
Sugiyama, Koichi*; Go, Shintaro*; Tomimatsu, Taro*; Kai, Tamito*; Nagae, Daisuke*; Ishibashi, Yuichi*; Matsunaga, Sotaro*; Nagata, Yuto*; Nishibata, Hiroki*; Washiyama, Kohei*; et al.
no journal, ,
We have successfully performed in-beam gamma-ray spectroscopy using the isomer-scope technique to study excited-state structure of neutron-rich heavy-actinide nuclei. The neutron-rich heavy-actinide nuclei were produced in the multinucleon-transfer reactions with a 
Cm target and 
O projectiles accelerated with the JAEA tandem accelerator. Projectile-like scattered particles were detected with Si E-
E telescopes placed at the backward angle, and target-like scattered particles of isomers were caught by an annular aluminum plate placed at about 60-mm downstream from the target. Four Ge detectors and 4 LaBr detectors were placed at the periphery of the aluminum plate, and detected gamma rays from the isomers. Gamma rays emitted from the actinide isomers were successfully observed with a good sensitivity owing to the tungsten shield placed between the target and the detectors.
Osawa, Takahito; Sasaki, Miki; Matsue, Hideaki
no journal, ,
The research reactor JRR-3 was restarted for the first time in 10 years, and was put into service on July 12, 2021. The prompt gamma ray analysis system (PGA) installed in the JRR-3 has excellent capabilities as an elemental analyzer, and a revolute joint robot is introduced during the outage period to enable automatic measurement. In this presentation, we will explain the restoration, sophistication, and current operating status of PGA after the earthquake.