Mitsubishi Electric, together with Mitsubishi Electric Plant Engineering Corporation, Nagoya University, and the Japan Atomic Energy Agency (JAEA), has received the 2026 R&D 100 Award for its Radioactive Airborne Particulate Monitor — a device capable of rapidly identifying and measuring airborne radioactive materials in nuclear facilities. The award is presented by R&D World, the leading international publication dedicated to technology research and development.
The system detects and quantifies both naturally occurring and artificial radionuclides, distinguishing between them with a level of precision that conventional monitors cannot match. Compared to traditional methods, it improves the detection limit by more than 100 times and reduces measurement time to less than one-sixth. Both achievements are delivered through a single technological architecture, with no need to send samples to external specialized laboratories.
The problem the device addresses has long been recognized across the industry. In facilities handling nuclear fuel, radioactive particles can become airborne in the event of an accidental release. Existing monitoring systems struggled to separate the alpha particles emitted by naturally occurring radioactive materials — always present in the environment — from those generated by artificial nuclear fuels. This ambiguity made it difficult to accurately assess the actual risk of internal exposure for workers, and often forced operations to halt pending laboratory analysis. The new monitor applies an unfolding technique that estimates the energy distribution of alpha particles in real time, identifying the type of radioactive material without any additional steps.
The R&D 100 Award is now in its 64th edition. This year, 100 winners were selected from 149 finalists representing eight countries, evaluated by a panel of more than 50 industry professionals. Mitsubishi Electric’s monitor was recognized in the IT/Electrical category. Of the 149 finalists, more than half developed their product in collaboration with at least one external partner — the same model followed by this Japanese consortium, which brought together industrial and academic expertise in a joint project.
The practical significance of this instrument extends well beyond a single award. As nuclear programs expand across Asia, Europe, and North America, demand for reliable and fast monitoring systems is set to grow. Next-generation power plants, fuel reprocessing facilities, and advanced research centers all require increasingly stringent occupational safety standards. A monitor capable of operating in real time — without delegating analysis to external facilities — is a tool that meaningfully transforms day-to-day operational procedures. The joint work between JAEA and Japan’s private industry demonstrates that collaboration between public research agencies and major industrial groups delivers measurable results, recognized at an international level.
