Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine

Narita, Hirokazu*; Maeda, Motoki*; Tokoro, Chiharu*; Suzuki, Tomoya*; Tanaka, Mikiya*; Shiwaku, Hideaki; Yaita, Tsuyoshi

RSC Advances (Internet), 13(25), p.17001 - 17007, 2023/06

https://doi.org/10.1039/D3RA01341C

no abstracts in English

Safe, efficient cementation of challenging radioactive wastes using alkali activated materials with high-flowability and high-anion retention capacity (Contract research); FY2021 Nuclear Energy Science & Technology and Human Resource Development Project

Collaborative Laboratories for Advanced Decommissioning Science; Hokkaido University*

JAEA-Review 2022-050, 116 Pages, 2023/01

JAEA-Review-2022-050.pdf:11.41MB

The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2021. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station (1F), Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2019, this report summarizes the research results of the "Safe, efficient cementation of challenging radioactive wastes using alkali activated materials with high-flowability and high-anion retention capacity" conducted from FY2019 to FY2021. Since the final year of this proposal was FY2021, the results for three fiscal years were summarized. The present study aims to explore alkali activated materials with high anionic nuclide retention and flowability and their recipes for safe storage and disposal of iron flocculant from the water treatment facility at 1F, and to propose a design of a solidification device that is feasible as an actual plant. In order to achieve these objectives, the following five items were carried out in this study.

Ultimate selenium(IV) monitoring and removal from water using a new class of organic ligand based composite adsorbent

Awual, M. R.; Yaita, Tsuyoshi; Suzuki, Shinichi; Shiwaku, Hideaki

Journal of Hazardous Materials, 291, p.111 - 119, 2015/06

https://doi.org/10.1016/j.jhazmat.2015.02.066

Mesoporous silica based novel conjugate adsorbent for efficient selenium(IV) detection and removal from water

Awual, M. R.; Hasan, M. M.*; Ihara, Toshihiro*; Yaita, Tsuyoshi

Microporous and Mesoporous Materials, 197, p.331 - 338, 2014/10

https://doi.org/10.1016/j.micromeso.2014.07.005

Size-selective extended X-ray absorption fine structure spectroscopy of free selenium clusters

Nagaya, Kiyonobu*; Yao, Makoto*; Hayakawa, Tetsuichiro*; Omasa, Yoshinori*; Kajihara, Yukio*; Ishii, Masashi*; Katayama, Yoshinori

Physical Review Letters, 89(24), p.243401_1 - 243401_4, 2002/12

https://doi.org/10.1103/PhysRevLett.89.243401

Recently, we proposed a new method for the size-selective EXAFS(Extended X-ray absorption fine structure) of neutral-free culsters, in which not only the X-ray absorption process but also the deexitation process are utilized as the structural information. In order to verify this method experimentally, we have developed the synchronous measurements of EXAFS and photoelectron photoion coincidence and carried them out for a Se cluster beam by utilizing the third-generation intense X-ray source. The EXAFS spectra for Se small clusters have been obtained and compared critically with theoretical predictions.

On the pressure-temperature phase diagram of ferroelectric triglycine selenate

; Ozawa, K.

Journal of the Physical Society of Japan, 37(4), p.1053 - 1055, 1974/04

https://doi.org/10.1143/JPSJ.37.1053

no abstracts in English

Development of analytical method for selenium-79 in high level active liquid waste by inductively coupled plasma mass spectrometry with collision reaction cell technique, 1

Saegusa, Yu; Yamamoto, Masahiko; Inada, Satoshi; Kuno, Takehiko

no journal, , 

Selenium-79 is a long half-life nuclide and emits low energy beta ray. Although it is difficult to analyze by radioactivity method, selenium-79 has high analytical needs for dose assessment due to the high occupancy rate of public exposure in the geological disposal of vitrified solids accompanying reprocessing of spent fuel. Selenium-79 can be measured by inductively coupled plasma mass spectrometry, however, accurate analysis is difficult due to the isobaric interference. In this study, we investigated analytical method for selenium-79 by inductively coupled plasma mass spectrometry with collision reaction cell technique. Selenium-79 can be measured after reaction with oxygen gas the cell and shift higher mass number. We will report the basic experiment results to measure selenium by collision reaction cell typed ICP-MS in this presentation.