Analysis procedure for halogen elements (bromine and iodine) in powder pellets using a sequential wavelength dispersive X-ray fluorescence spectrometry system at the Tono Geoscience Center, JAEA

Watanabe, Takahiro; Kida, Fukuka; Nara, Fumiko; Yamasaki, Shinichi*; Tsuchiya, Noriyoshi*

JAEA-Testing 2025-006, 52 Pages, 2025/12

JAEA-Testing-2025-006.pdf:6.72MB

Total bromine and iodine concentrations in geological samples serve as valuable geochemical proxies for reconstructing past environmental changes, including relative sea-level changes and marine incursions into an inland area. These halogens have also been used in previous studies to identify past tsunami and storm surge deposits in geological records. Such information contributes to the evaluation of long-term geosphere stability, which is an essential aspect in the geological disposal of high-level radioactive waste. At the Tono Geoscience Center, a sequential wavelength dispersive X-ray fluorescence spectrometry system (WDXRF) has been installed for the major and trace element measurements. However, the application of WDXRF analyses to bromine and iodine has not been established. In this study, we developed analytical methods of total bromine and iodine contents using powdered pellets of standard reference materials. Additionally, evaluation tests of calibration curves were performed using the WDXRF. The validated method was then applied to sediment samples to examine its utility in determination of halogen concentrations.

Bromine and iodine analyses of geological samples by wavelength dispersive X-ray fluorescence spectrometry

Watanabe, Takahiro; Kida, Fukuka; Yamasaki, Shinichi*; Yamagishi, Hiroyuki*; Ochiai, Shinya*; Matsunaka, Tetsuya*; Nara, Fumiko; Tsuchiya, Noriyoshi*

Bunseki Kagaku, 74(10-11), p.611 - 619, 2025/10

https://doi.org/10.2116/bunsekikagaku.74.611

Bromine and iodine contents in geological samples can be used as useful tools to understand various environmental phenomena such as past sea-level changes, geological uplift and subsidence, as well as marine incursion to the inland due to paleo tsunami and storm surges. In this study, we measured bromine and iodine contents in possible standard materials and lake sediment samples using the WDXRF at Tono Geoscience Center and polarizing EDXRF at Tohoku University. We compared both results and confirmed that the WDXRF method for Bromine and iodine content determinations can provide the reliable results.

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.

Lacustrine sediments in circular abandoned channels of the upper Oi river: estimation of its depositional environment

Uchida, Mao; Ogata, Manabu; Komatsu, Tetsuya; Nishiyama, Nariaki; Nara, Fumiko; Kida, Fukuka; Ogita, Yasuhiro; Nakanishi, Toshimichi*

no journal, , 

no abstracts in English

Basic research programs of vitrification technology for waste volume reduction, 91; Improved TEHDGA column flow for MA + Ln co-recovery

Ishizawa, Kenta*; Akuzawa, Tadashi*; Kida, Fukuka*; Arai, Tsuyoshi*; Watanabe, So; Sano, Yuichi; Takeuchi, Masayuki

no journal, , 

no abstracts in English

Geochemical evaluation of the fluid-rock interaction at the Gosukebashi Fault, northeastern area of the Rokko Mountains

Kagami, Saya; Niwa, Masakazu; Yokoyama, Tatsunori; Shimada, Koji; Kida, Fukuka

no journal, , 

Understanding of the fluid-rock interaction in fault gouges is important to evaluate the activity of faults and reactivation of the inactive faults. The fluid-rock interaction in Taiwan Chelungpu fault activated at the Chi-Chi earthquake has been discussed by Ishikawa et al. (2008) based on the elemental distribution in hydrothermal experiments with sediments and trace elements concentrations and isotope ratios of the fault gouges. In this study, we tried to evaluate the fluid-rock interaction in the Gosukebashi Fault of Rokko Granite based on geochemical compositions of the fault gouge in the similar approach with the above. The analyses of chemical compositions and Sr isotopes of the Gosukebashi Fault samples indicated that the fluid-rock interaction in the Gosukebashi Fault was different from that at 350C seen in Chelungpu fault and the gouge in this study did not interact with hot fluid during past faulting movements. We will carry more detailed chemical composition and isotope analysis to reveal the changes in chemical composition of the gouge caused by fault movement and understand the fluid-rock interaction of the Gosukebashi Fault gouge.

Holocene sea-level changes in Japan coastal areas recovered from the brackish lake sediment cores based on physical properties and geochemical analysis

Nara, Fumiko; Kida, Fukuka; Ochiai, Shinya*; Watanabe, Takahiro; Matsunaka, Tetsuya*; Hashino, Kotaro*; Yamasaki, Shinichi*; Tsuchiya, Noriyoshi*

no journal, , 

In our current research, we are focusing on using the brackish lake sediments from Lake Kibagata (Komatsu city, Ishikawa prefecture) on the Japan Sea coast to gain information about the past sea-level changes. Contrary to the Pacific side, the study of the past sea level changes on the Japan Sea side is still limited. To clarify the past sea level response to climate-induced water mass changes, either eustatic or due to GIA, understanding the past sea-level changes in relatively enclosed environments, such as the Japan Sea, is essential. Lake Kibagata is located about 5 km inland from the coastline of the Japan Sea and has not undergone large-scale artificial modifications such as land reclamation. The physical properties (CT image, porosity and magnetic susceptibility, which measured by the multi senser core logger at Kochi Core Center under Kochi Core Center Open Facility System) and the geochemical (Br, I, and trace elements measured by XRF) analysis were conducted on the core KB2023. Based on these data, we will present a report on the past sea level changes at the late Holocene that took place along the Japan Sea coast.

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.

Bromine and Iodine analyses for lake sediment samples; Estimation of past marine incursion to the inland using WDXRF

Watanabe, Takahiro; Kida, Fukuka; Yamasaki, Shinichi*; Ochiai, Shinya*; Matsunaka, Tetsuya*; Nara, Fumiko; Tsuchiya, Noriyoshi*

no journal, , 

no abstracts in English

None

Kida, Fukuka; Watanabe, Takahiro; Nara, Fumiko

no journal, , 

no abstracts in English