Radiocarbon measurement of a small-scale sample with a cementite target at JAEA-AMS-TONO

Minamitani, Fumina; Nishio, Tomohiro; Fujita, Natsuko; Maeta, Yusuke; Miyake, Masayasu*; Matsubara, Akihiro*; Jinno, Satoshi; Ogita, Yasuhiro; Watanabe, Takahiro

Nuclear Instruments and Methods in Physics Research B, 579, p.166245_1 - 166245_7, 2026/10

https://doi.org/10.1016/j.nimb.2026.166245

The Tono Geoscience Centre has started to build up a small analysis of radiocarbon using cementite. It is characterised by homogeneous target synthesis and stable measurements with high accuracy and low background. In order to establish the optimum cementite preparation method at the centre, the type of iron, conditions of use, reaction yield, reproducibility of measurement and background were investigated. In sample preparation, target production in high yield was successfully achieved by devising the conditions for the use of iron catalysts. Although the measurement conditions are still under investigation, the beam intensity was found to be sufficient for the measurement and the prescisions were relatively high. This presentation will report on the characteristics of small-scale analysis with cementite at this centre.

Present status of the JAEA-AMS-TONO-5MV; Primarily on dealing with failures

Matsubara, Akihiro*; Uno, Sadanori*; Miyake, Masayasu*; Maeta, Yusuke; Omae, Akiomi*; Kitano, Toshihiko*; Fujita, Natsuko

Dai-37-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.114 - 117, 2026/03

no abstracts in English

Annual report for research on geosphere stability for long-term isolation of radioactive waste in fiscal year 2024

Asamori, Koichi; Sueoka, Shigeru; Kobayashi, Tomoharu; Nishiyama, Nariaki; Tanaka, Kiriha; Murakami, Osamu; Fukuda, Shoma; Ogata, Manabu; Uchida, Mao; Komatsu, Tetsuya; et al.

JAEA-Research 2025-007, 99 Pages, 2025/10

JAEA-Research-2025-007.pdf:12.36MB

This annual report documents the progress of research and development (R&D) in the 3rd fiscal year of the JAEA 4th Medium- and Long-term Plan (fiscal years 2022-2028) to provide the scientific base for assessing geosphere stability for long-term isolation of high-level radioactive waste. The plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques. The current status of R&D activities with previous scientific and technological progress is summarized.

Present status of the JAEA-AMS-TONO (2023); Primarily on the cause of the varistor damage

Matsubara, Akihiro*; Fujita, Natsuko; Miyake, Masayasu; Ishii, Masahiro*; Omae, Akiomi*; Maeta, Yusuke; Uno, Sadanori*

Dai-36-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.125 - 129, 2025/03

We will report on the maintenance and management of JAEA-AMS-TONO-5MV (NEC 15SDH-2, maximum terminal voltage 5.0 MV) located at the Toki Geochronology Research Institute, Tono Geoscience Center, Japan Atomic Energy Agency; (1) Regarding damage to varistors in beamline equipment and its causes, (2) Phenomena that suggest a vacuum leak in the accelerator tube of a tandem accelerator and its countermeasures.

Research plan on geosphere stability for long-term isolation of radioactive waste (Scientific program for fiscal year 2024)

Niwa, Masakazu; Shimada, Akiomi; Asamori, Koichi; Sueoka, Shigeru; Komatsu, Tetsuya; Nakajima, Toru; Ogata, Manabu; Uchida, Mao; Nishiyama, Nariaki; Tanaka, Kiriha; et al.

JAEA-Review 2024-035, 29 Pages, 2024/09

JAEA-Review-2024-035.pdf:1.24MB

This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in Japan Atomic Energy Agency (JAEA), in fiscal year 2024. The objectives and contents of this research are described in detail based on the JAEA 4th Medium- and Long-term Plan (fiscal years 2022-2028). In addition, the background of this research is described from the necessity and the significance for site investigation and safety assessment, and the past progress. The plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques.

Present status of the JAEA-AMS-TONO (2024FY)

Maeta, Yusuke; Fujita, Natsuko; Miyake, Masayasu; Matsubara, Akihiro*; Uno, Sadanori*; Omae, Akiomi*; Jinno, Satoshi; Minamitani, Fumina; Watanabe, Takahiro; Nishio, Tomohiro*; et al.

no journal, , 

The JAEA-AMS-TONO facility at the Tono Geoscience Center, JAEA has three accelerator mass spectrometers. We report the present status of the JAEA-AMS-TONO.

Research and development for accelerator mass spectrometer at JAEA-AMS-TONO; 2024

Fujita, Natsuko; Jinno, Satoshi; Minamitani, Fumina; Miyake, Masayasu; Matsubara, Akihiro*; Maeta, Yusuke; Kida, Fukuka; Ogawa, Yumi; Nishio, Tomohiro*; Omae, Akiomi*; et al.

no journal, , 

The JAEA-AMS-TONO facility at the Tono Geoscience Center, JAEA has three accelerator mass spectrometers. We report the present status of the JAEA-AMS-TONO.