Comparison of age dating using thermal ionization mass spectrometer with alpha spectrometer

Noerpitasari, E.*; Kimura, Yoshiki*; Umino, Yuji*; Yamaguchi, Tomoki

no journal, , 

Preparation of Tc medical solution dissolved with minute amount of pure water or saline solution

Asai, Masato; Kimura, Hiroyuki*; Kabuki, Shigeto*; Sato, Tetsuya; Tsukada, Kazuaki*; Ito, Yuta*

no journal, , 

We have developed a new technique to prepare minute amount of Tc medical solution from irradiated MoO samples. The sublimation and thermochromatography technique was used to separate Tc from MoO where the Tc were deposited at low-temperature part of the chromatography column. We have succeeded in recovering 80-90% of the deposited Tc with only 300 L of pure water or saline solution without using any acid and alkali. This enables us to prepare the highly-concentrated Tc medical solution in the easiest and simplest way.

Isothermal gas chromatographic behavior of volatile oxychlorides of short-lived molybdenum and tungsten as a model of element 106, seaborgium

Sato, Tetsuya; Natori, Hina*; Otani, Ryo; Tsukada, Kazuaki*; Ito, Yuta*; Asai, Masato; Sakama, Minoru*; Goto, Shinichi*; Nishio, Katsuhisa; Makii, Hiroyuki; et al.

no journal, , 

Superheavy elements with an atomic number greater than 100 may deviate from periodic trends due to strong relativistic effects. As a model experiment of seaborgium (Sg), element 106, we conducted gas-phase chemistry experiments using isothermal gas chromatography (IGC) with short-lived isotopes of molybdenum (Mo) and tungsten (W), which are homologues of Sg. Volatile oxychlorides were successfully synthesized by reacting them with chlorinating agents, and their chromatographic behavior was analyzed. The measured adsorption enthalpy (- of Mo was in good agreement with the evaluated value for MoOCl, suggesting the exclusive formation of this compound. It was also confirmed that tungsten forms volatile oxychlorides. These results support future gas-phase studies of Sg.

Analysis of impurities in uranium ore concentrates using hand-held Raman spectroscopy

Nishiwaki, Hiroki; Kimura, Yoshiki; Yamaguchi, Tomoki

no journal, , 

Synchrotron-based analysis of spherical iron oxide particles found in Hiroshima Bay

Satou, Yukihiko; Endo, Satoru*; Akaji, Ryoga*; Shobu, Takahisa; Tominaga, Aki; Sumita, Takehiro*

no journal, , 

This study explores spherical iron oxide particles from Hiroshima Bay, once hypothesized to originate from the atomic bombing. Despite prior suggestions of high-temperature formation, no radioactive nuclides such as Cs or U were detected. Using synchrotron-based techniques developed for Fukushima microparticles, samples from Ujina Island were analyzed. X-ray computed tomography revealed large internal voids, and XRF/SEM-EDS showed Fe, Si, and Al as major constituents. Comparisons with welding splatter and fireworks indicated distinct structural and elemental differences. These findings suggest formation under extraordinary thermal conditions, with future XRD and SIMS analyses expected to further clarify their origin.

Analysis of Ba/La detections at the CTBT Okinawa radionuclide monitoring station in May 2010

Furuno, Akiko; Kijima, Yuichi; Kurihara, Toshiyuki; Tomita, Yutaka

no journal, , 

The radioactive nuclides Ba and La, which are not normally detected during routine observations, were detected at the CTBT Radionuclide Monitoring Station in Okinawa from May 15 to 21, 2010. According to previous studies, these are likely to be decadent nuclides of Xe produced by nuclear fission reactions, and there is speculation that a nuclear test may have been conducted near the Punggye-ri nuclear test site in North Korea in May 2010. However, there is no consensus on the source of these emissions. We estimate the source of these detected events from the perspective of atmospheric dispersion.