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Report No.
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Development of rapid and sensitive radionuclide analysis method by simultaneous analysis of $$beta$$, $$gamma$$, and X-rays (Contract research); FY2021 Nuclear Energy Science & Technology and Human Resource Development Project

Collaborative Laboratories for Advanced Decommissioning Science; Japan Chemical Analysis Center*

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 FY2021. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2020, this report summarizes the research results of the "Development of rapid and sensitive radionuclide analysis method by simultaneous analysis of $$beta$$, $$gamma$$, and X-rays" conducted in FY2021. The present study aims to enable rapid analysis of radionuclides in fuel debris and waste, we have established the latest measurement system, such as the multiple $$gamma$$-ray detection methods, and the Spectral Determination Method (hereafter referred to "SDM") was developed. In the study, the $$gamma$$-ray measuring device was installed, and the measurement system consisting of the Ge detector, CeBr$$_{3}$$ detector, and NaI detector was completed in FY2021. In the SDM development, standard spectra of $$gamma$$-ray singles, multiple $$gamma$$-ray measurements, …

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