Publication Date： January 16, 2026
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Development of a Novel Omnidirectional Radiation Detector
－Quantification of the Three-Dimensional Distribution of Radioactive Nuclides－
Fig. 1 Example of 3D surface dose rate distribution estimated using the FRIE system
A new omnidirectional radiation detector capable of determining where and how much radioactive material is present in three dimensions has been developed.
With conventional survey measurements, determining the direction of incoming radiation or the spatial distribution of radioactive sources is difficult, and requires point-by-point measurements. The newly developed detector, FRIE (Fractal Radiation Imaging Element), features a unique structure that can detect radiation from all directions, enabling three-dimensional mapping of radioactive nuclide distributions, and requires fewer measurement points compared to conventional methods.
The detector provides the angular resolution of approximately 30 degrees. Radiation data and positional information obtained every second are analyzed, enabling the reconstruction of three-dimensional activity distributions (Fig. 1). Using a simplified analytical model, FRIE can also serve as a direction-indicating monitoring post, providing real-time visualization of incident radiation directions.
With this technology, real-time, high-precision monitoring of radiation environments at decommissioning sites and radiation-controlled areas can be provided, contributing to safer, more efficient operations and better environmental management.
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