Development of radiation field mapping measurement system based on high radiation tolerant solar cells for low-light illumination (Contract research). FY2022 Nuclear Energy Science & Technology and Human Resource Development Project

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 FY2022. Among the adopted proposals in FY2022, this report summarizes the research results of the 'Development of radiation field mapping measurement system based on high radiation tolerant solar cells for low-light illumination' conducted in FY2022. The objective of the present study is to develop a system that can map radiation fields by applying independent and remotely operated sensors to obtain real-time radiation information in PCV. The system will be implemented in an actual environment to ensure the safety of workers and equipment by monitoring the leakage of gamma rays and neutrons, which are highly penetrating and can be a cause of accidents. Solar cell dosimeters are being developed as a compact sensor of the built-in potential drive type that utilizes a device with high radiation tolerance that has been developed as a solar cell for space use. The CIGS solar cell dosimeter is the basis for the development of a system with high functionality and systemization for 1F packaging. In FY2022, we will develop fabrication facilities for flexible devices based on the CIGS solar cell device structure, and elucidate the initial characteristics of the prototypes by gamma-ray, electron-beam, and neutron-beam irradiation tests. For the neutron detection structure, we are considering the deposition of boron as a conversion material by coating, and are clarifying the conditions for the preparation of powder material particle size, and selecting the coating method and solvent conditions. For mapping measurement, equipment that can detect radiation by connecting multiple solar cells and switching between them will be selected. (author)