Microscopic structural analysis of lead borate-based glass

作者：Mukunoki Atsushi^*; Chiba Tamotsu; Benino Yasuhiko; Sakuragi Tomofumi

来源：Progress in Nuclear Energy, 2016, 91: 339-344.

DOI：10.1016/j.pnucene.2016.05.008

• Iodine
• Lead borate glass
• Reverse Monte Carlo method
• Neutron structure factor

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 B-11 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.

• 出版日期2016-8