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Masumi Matsumura

University of Tsukuba

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Kimikazu Sasa

University of Tsukuba

Keisuke Sueki

University of Tsukuba

Tsutomu Takahashi

Japan Agency for Marine-Earth Science and Technology

Tetsuya Matsunaka

Kanazawa University

Seiji Hosoya

National Institutes for Quantum and Radiological Science and Technology

Hongtao Shen

Guangxi Normal University

Yukihiko Satou

Japan Atomic Energy Agency

Hiroyuki Matsuzaki

The University of Tokyo

Norikazu Kinoshita

Shimizu (Japan)

Y. Ochiai

Tokyo University of Science

Cooperative Institutions

University of Tsukuba

The University of Tokyo

Tohoku University

University of Arizona

Guangxi Normal University

National Institute of Advanced Industrial Science and Technology

Graduate School USA

Osaka University

High Energy Accelerator Research Organization

Institut de l'Information Scientifique et Technique

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The new 6 MV multi-nuclide AMS facility at the University of Tsukuba

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2015)

Kimikazu Sasa Tsutomu Takahashi Masumi Matsumura Tetsuya Matsunaka Yukihiko Satou

Pelletron

Accelerator mass spectrometry

Tandem accelerator

Nuclide

10.1016/j.nimb.2015.04.028

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Citations (17)

Riverine 129I dynamics during high-flow events on the Abukuma River in Fukushima

Applied Geochemistry (2024)

Yoshifumi Wakiyama Masumi Matsumura Tetsuya Matsunaka Shigekazu Hirao Kimikazu Sasa

Dilution

10.1016/j.apgeochem.2024.106134

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Citations (1)

Study on monitoring of volcanic activity using 129I/127I ratios in hydrothermal system at Zao volcano

Tetsuya Matsunaka Kimikazu Sasa Keisuke Sueki Nao Shibayama Tsutomu Takahashi

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Development of low-background measuring methods of Chlorine-36 with accelerator mass spectrometry

The Japan Society of Applied Physics (2019)

Y. Ochiai Kimikazu Sasa Tsutomu Takahashi Masumi Matsumura Keisuke Sueki

Accelerator mass spectrometry

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Distribution of iodine-129 released into the environment from the Fukushima No.1 nuclear power plant accident - correlation with iodine-131 and comparison with radioactivity ratios in reactors

Kimikazu Sasa Keisuke Sueki Tsutomu Takahashi Masumi Matsumura Yukihiko Sato

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Beppu Bay, Japan, as a candidate Global boundary Stratotype Section and Point for the Anthropocene series

The Anthropocene Review (2022)

Michinobu Kuwae Bruce P. Finney Zhiyuan Shi Aya Sakaguchi Narumi K. Tsugeki

For assessment of the potential of the Beppu Bay sediments as a Global boundary Stratotype Section and Point (GSSP) candidate for the Anthropocene, we have integrated datasets of 99 proxies. The datasets for the sequences date back 100 years for most proxy records and 1300 years for several records. The cumulative number of occurrences of the anthropogenic fingerprint reveal unprecedented increases above the base of the 1953 flood layer at 64.6 cm (1953 CE), which coincides with an initial increase in global fallout of 239 Pu+ 240 Pu. The onset of the proliferation of anthropogenic fingerprints was followed by diverse human-associated events, including a rapid increase in percent modern 14 C in anchovy scales, changes in nitrogen and carbon cycling as recorded by anchovy δ 15 N and δ 13 C, elevated pollution of heavy metals, increased deposition of novel materials (spheroidal carbonaceous particles, microplastics, polychlorinated biphenyls), the occurrence of hypoxia (Re/Mo ratio) and eutrophication (biogenic opal, TOC, TN, diatoms, chlorophyll a), unprecedented microplankton community changes (compositions of carotenoids, diatoms, dinoflagellates), abnormally high spring air temperatures as inferred from diatom fossils, and lithological changes. These lines of evidence indicate that the base of the 1953 layer is the best GSSP level candidate in the stratigraphy at this site.

Stratotype

10.1177/20530196221135077

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Citations (12)

Optimization of aΔE-Edetector for 41 Ca AMS

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2017)

Seiji Hosoya Kimikazu Sasa Tetsuya Matsunaka Tsutomu Takahashi Masumi Matsumura

Accelerator mass spectrometry

Pelletron

Nuclide

Tandem accelerator

10.1016/j.nimb.2017.03.161

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Citations (7)

Isobar suppression for 36Cl accelerator mass spectrometry at the University of Tsukuba

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2018)

Seiji Hosoya Kimikazu Sasa Tsutomu Takahashi Tetsuya Matsunaka Masumi Matsumura

Accelerator mass spectrometry

Isobar

Tandem accelerator

Isobaric process

Nuclide

10.1016/j.nimb.2018.07.001

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Citations (7)

Distribution of 129 I in the environment released from the FDNPP accident and estimation of 131 I/ 129 I ratio

Japan Geoscience Union (2014)

Kimikazu Sasa Masumi Matsumura Keisuke Sueki Tsutomu Takahashi Tetsuya Matsunaka

Accident (philosophy)

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Development of the Ultrasensitive Detection Method for 41 Ca by means of Accelerator Mass Spectrometry

The Japan Society of Applied Physics (2019)

Kimikazu Sasa Y. Ochiai Tsutomu Takahashi Masumi Matsumura Keisuke Sueki

Accelerator mass spectrometry

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Citations (0)