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Physical properties of sintered UO $_{2}$ specimens containing over 10% simulated MA were investigated. Based on the measured data, a prediction method for the properties was introduced.

Oral presentation

Study of water transfer in cement interstices by 1H NMR relaxation time method

Sakata, Nagisa*; Tachi, Yukio; Iwadate, Yasuhiko*; Okubo, Takahiro*

no journal, ,

Cement-based materials will be used as a component for radioactive waste disposal facility. Understanding water paths in cement-based materials is a key to evaluate their long-term performance. It is well known that 1H transverse relaxation (T2) of water filled pores is related to their porous structure. In this study, 1H T2 distribution analyses were applied to hydration process of cement-based materials, and the relationship between porous structure and mass transport was discussed. Experimental results showed that the main path of water is the grain boundary between cement and silica sand contained in mortar. In addition, C-S-H gel layers in cement and C-S-H gel pore cannot contribute as a path of water.

Oral presentation

Evaluation of dispersion and aggregation of nanoparticles in liquid metal via NMR

Tei, C.; Otaka, Masahiko; Kuwahara, Daisuke*

no journal, ,

Evaluation of nanoparticles in liquid phase dispersants has been carried out by using methods such as particle size measurement and transmission electron microscopy. It is difficult to apply it to chemically active liquid metals (impermeable to visible light) that cannot be handled in the atmosphere. In this study, the NMR methods based on evaluating the interfacial state of sodium-nanoparticles in liquid metallic sodium (Na) was investigated for metallic nanoparticle dispersions. There are two types liquid Na in contact with the surface of the nanoparticles (atomic state bound to the particle surface) and liquid Na away from the particle surface (free atomic state). The relaxation time of each depends on the bound state of the atoms. The clear difference in relaxation times and the relative specific surface area estimated from the relaxation times are also obtained, leading to the development of methods for assessing the state of nanoparticles in liquid metal.

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Relaxation time of radiation-induced radicals in -ray irradiated amino acids

Peak-fitting analysis with Gaussian line shapes against experimental ESR spectrum consisting of multiple peak

Pulsed EPR studies of shallow donor impurities in SiC

Effect of non-polar gas on water in cut carnation flowers

Time-resolved FT-ESR and cw-ESR studies on photo-initiated polymerization

Depth profile of oxide-trapped charges in 6H-SiC metal-oxide-semiconductor structures irradiated with gamma-rays

Pulsed NMR study of radiation polymerization and crosslinking of n-isopropylacrylamide

None

Changes in dielectric properties of elastomer by irradiation

Blowdown thrust force under pipe rupture accident, I; Experimental evaluations of blowdown thrust force and decompression characteristics

Electric conduction of low density polyethylene induced by high dose rate gamma rays

Measurement of radicals induced in irradiated foods using Pulse-ESR

Relaxation time of radiation induced radicals in -ray irradiated amino acids

Study on the physical properties of non-stoichiometric oxide fuels with high minor actinide contents, 6; Evaluation of fuel properties for simulated MA containing oxide fuel

Study on the physical properties of non-stoichiometric oxide fuels with high minor actinide contents, 7; Estimation of fuel properties for large amount of simulated MA containing oxide fuel

Study of water transfer in cement interstices by 1H NMR relaxation time method

Evaluation of dispersion and aggregation of nanoparticles in liquid metal via NMR