Microscopic structural analysis of lead borate-based glass

Atsushi Mukunoki; Tamotsu Chiba; Yasuhiko Benino; Tomofumi Sakuragi

doi:10.1016/j.pnucene.2016.05.008

Microscopic structural analysis of lead borate-based glass

Atsushi Mukunoki, Tamotsu Chiba, Yasuhiko Benino, Tomofumi Sakuragi

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The development of an iodine immobilization technique that can retain radioactive iodine in a waste form for a long period and constrain its leaching into pore water is necessary in order to secure the long-term safety of geological disposal of transuranic waste. Lead borate glass vitrified at a low temperature is regarded as a promising material for immobilizing the Iodine-129 that is recovered from spent AgI filters used in reprocessing plants in Japan. Structural models of lead borate-based glass were constructed by the Reverse Monte Carlo (RMC) method based on experimental information from such sources as neutron and high-energy X-ray diffraction, XAFS, and ¹¹B MAS NMR spectroscopic analyses. The neutron structure factors [S_N(Q)] and X-ray structure factors [S_X(Q)] that were calculated by RMC and measured by J-PARC/MLF-BL20 and SPring-8/BL04B2 suggest that RMC results are consistent with experimental measurements and reveal that structural information of neutrons is indispensable for analyzing the surrounding boron structures.

Original language	English
Pages (from-to)	339-344
Number of pages	6
Journal	Progress in Nuclear Energy
Volume	91
DOIs	https://doi.org/10.1016/j.pnucene.2016.05.008
Publication status	Published - Aug 1 2016

Keywords

Iodine
Lead borate glass
Neutron structure factor
Reverse Monte Carlo method

ASJC Scopus subject areas

Nuclear Energy and Engineering
Safety, Risk, Reliability and Quality
Energy Engineering and Power Technology
Waste Management and Disposal

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10.1016/j.pnucene.2016.05.008

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title = "Microscopic structural analysis of lead borate-based glass",

abstract = "The development of an iodine immobilization technique that can retain radioactive iodine in a waste form for a long period and constrain its leaching into pore water is necessary in order to secure the long-term safety of geological disposal of transuranic waste. Lead borate glass vitrified at a low temperature is regarded as a promising material for immobilizing the Iodine-129 that is recovered from spent AgI filters used in reprocessing plants in Japan. Structural models of lead borate-based glass were constructed by the Reverse Monte Carlo (RMC) method based on experimental information from such sources as neutron and high-energy X-ray diffraction, XAFS, and 11B MAS NMR spectroscopic analyses. The neutron structure factors [SN(Q)] and X-ray structure factors [SX(Q)] that were calculated by RMC and measured by J-PARC/MLF-BL20 and SPring-8/BL04B2 suggest that RMC results are consistent with experimental measurements and reveal that structural information of neutrons is indispensable for analyzing the surrounding boron structures.",

keywords = "Iodine, Lead borate glass, Neutron structure factor, Reverse Monte Carlo method",

author = "Atsushi Mukunoki and Tamotsu Chiba and Yasuhiko Benino and Tomofumi Sakuragi",

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AU - Mukunoki, Atsushi

AU - Chiba, Tamotsu

AU - Benino, Yasuhiko

AU - Sakuragi, Tomofumi

N1 - Funding Information: This research is a part of “Research and development of processing and disposal technique for TRU waste (FY2013)” under a grant (agreement No. 20130902-4 ) from the Agency of Natural Resources and Energy , the Ministry of Economy Trade and Industry of Japan . Publisher Copyright: © 2016 Elsevier Ltd.

PY - 2016/8/1

Y1 - 2016/8/1

N2 - The development of an iodine immobilization technique that can retain radioactive iodine in a waste form for a long period and constrain its leaching into pore water is necessary in order to secure the long-term safety of geological disposal of transuranic waste. Lead borate glass vitrified at a low temperature is regarded as a promising material for immobilizing the Iodine-129 that is recovered from spent AgI filters used in reprocessing plants in Japan. Structural models of lead borate-based glass were constructed by the Reverse Monte Carlo (RMC) method based on experimental information from such sources as neutron and high-energy X-ray diffraction, XAFS, and 11B MAS NMR spectroscopic analyses. The neutron structure factors [SN(Q)] and X-ray structure factors [SX(Q)] that were calculated by RMC and measured by J-PARC/MLF-BL20 and SPring-8/BL04B2 suggest that RMC results are consistent with experimental measurements and reveal that structural information of neutrons is indispensable for analyzing the surrounding boron structures.

AB - The development of an iodine immobilization technique that can retain radioactive iodine in a waste form for a long period and constrain its leaching into pore water is necessary in order to secure the long-term safety of geological disposal of transuranic waste. Lead borate glass vitrified at a low temperature is regarded as a promising material for immobilizing the Iodine-129 that is recovered from spent AgI filters used in reprocessing plants in Japan. Structural models of lead borate-based glass were constructed by the Reverse Monte Carlo (RMC) method based on experimental information from such sources as neutron and high-energy X-ray diffraction, XAFS, and 11B MAS NMR spectroscopic analyses. The neutron structure factors [SN(Q)] and X-ray structure factors [SX(Q)] that were calculated by RMC and measured by J-PARC/MLF-BL20 and SPring-8/BL04B2 suggest that RMC results are consistent with experimental measurements and reveal that structural information of neutrons is indispensable for analyzing the surrounding boron structures.

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KW - Reverse Monte Carlo method

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Microscopic structural analysis of lead borate-based glass

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Keywords

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