Environmental Radionuclide Science & Engineering

Associate Professor

  • FUJIKAWA, Yoko e-mail: fujikawa<atmark>

* replace <atmark> with @rri.kyoto-u.ac.jp
Investigation of the behavior and remediation technology of radioactive and non-radioactive pollutants in the environment

We have investigated the behavior of radioactive and non-radioactive pollutants, as well as environmental remediation technologies, with special focus on the geo-hydrological environment. Our research activities encompass (1) laboratory test to clarify the distribution of pollutants among geological media, water, and plants, (2) development of analytical methods to determine the concentration and chemical speciation of pollutants, (3) field research of distribution radioactive Cs (rad-Cs hereafter), U and Pu in the environment, (4) development of on-site decontamination technologies for soil and water, and (5) contaminant transport modeling, and statistical analysis of environmental data.

Toward the safe disposal of solid wastes and protection / remediation of groundwater

The Fukushima Daiichi Nuclear Power Plant accident in 2011 has created an entirely new dimension in environmental problems: rad-Cs contamination of the general environment. The contamination has led to the generation of a vast amount of wastes containing rad-Cs. One of our research activities was the decontamination and volume reduction of such wastes (Fig. 1). To validate that the rad-Cs containing wastes can be safely disposed of, the collection of actual data from the actual environment was considered effective. We, therefore, started to monitor the leachate and groundwater from monitoring wells, at the waste landfills that have accepted the incineration ash containing rad-Cs (Fig. 2). Using the groundwater level data and water quality data, as well as the core-boring data, we conducted the groundwater flow simulation (Fig. 3). The big-data obtained from the monitoring was analyzed using a pattern recognition approach based on machine learning.

We also worked on the application of biological filtration using iron-oxidizing bacteria, for the on-site treatment of groundwater containing arsenic. After the pilot test in Japan and Vietnam, the technology was used for the potable water treatment in a village in Vietnam (Fig.4).

 We have recently launched a new project studying the rad-Cs contamination of groundwater in North Europe and Ukraine.

Groundwater survey in the GAB, Australia