Exosens develops advanced radiation detection and measurement technologies designed for safety-critical environments.
Built on decades of expertise, the group delivers high-performance detectors and sensor systems that support safer, smarter, and more resilient operations. Learn more about Nuclear & Radiation ↓
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Advanced detection technologies
Exosens leverages a strong technological heritage in radiation detection, combining expertise from Photonis Nuclear Instrumentation and Centronic to deliver high-performance solutions.
Its technologies include:
• neutron and gamma detectors
• Geiger-Müller tubes
• silicon photodiodes
• ionization chambers
• custom sensor systems for radiation detection and measurement
Designed for extreme environments, these technologies ensure high levels of precision, durability, and reliability, meeting the most stringent industry requirements.
Supporting critical applications
Exosens solutions are deployed across a wide range of safety-critical industries, including:
• Nuclear energy: Reactor control, radiation monitoring, fuel cycle facilities, and waste management
• Aerospace: Radiation detection systems for space missions and harsh environments
• Defense: Detection and monitoring systems for security and protection
• Medical diagnostics: Radiation measurement and detection technologies for healthcare applications
These applications rely on accurate and reliable radiation detection to ensure safety, performance, and compliance.
Delivering performance, reliability and expertise
Exosens has established itself as a global leader in nuclear instrumentation and radiation detection by combining decades of experience with strong industrial capabilities.
With vertically integrated manufacturing in France and the UK, the group maintains full control over quality and performance. Its multidisciplinary teams of scientists and engineers work closely with customers to develop standard, customized, and bespoke solutions tailored to specific operational requirements.
By building on a legacy of precision, innovation, and trust, Exosens continues to deliver advanced technologies that support critical industries worldwide
Fields of expertise
Exosens’s expertise spans the entire production process, from in-house design and manufacturing to precision machining, environmental testing, and final inspection. By maintaining complete control over all operational sequences, Exosens ensures the highest quality, reliability, and performance standards.
Our dedicated team of scientists and engineers—specializing in chemistry, physics, materials science, and electronics—collaborates closely with customers to support design and development efforts, ensuring tailored solutions that meet the most demanding industry requirements.
Project Management
Exosens understands that successful project execution is critical to our customers. Our dedicated project managers follow stringent industry-standard methodologies to ensure clear communication, risk mitigation, and on-time delivery. We have extensive experience managing projects ranging from low-volume prototyping to large-scale, large design and manufacturing contracts.
Manufacturing Excellence
Since 1945, we have experience supplying specialized products and solutions for radiation safety, nuclear instrumentation, and defense applications, Exosens offers precision design, assembly, and manufacturing services across a wide range of industries. Our capabilities span from prototype development to high-volume production orders, backed by a multidisciplinary team of physicists, electronic engineers, and electro-mechanical designers.
Exosens specializes in complex brazed and welded precision assemblies using a unique range of materials, including stainless steel, titanium, copper, nickel, nickel-iron alloys, alumina ceramics, and mineral-insulated cables. Our expertise covers components of all sizes, from intricate sub-assemblies to large-scale systems.
Test & Calibration
Exosens’s manufacturing processes incorporate rigorous testing of both sub-assemblies and final products. Our Brive-la-Gaillarde, France, and Croydon, UK facilities house multiple radiation sources for in-house testing and calibration of radiation detection equipment.
We also offer in-house helium leak testing, pressurized vacuum-tight envelope testing, and electrical testing, including insulation resistance measurements and high-voltage breakdown assessments.
Quality Assurance
Quality is at the core of our operations. Exosens adheres to stringent international standards, including ISO 9001 and ISO 14001 quality and environmental standards as well as sector-specific certifications for key nuclear, aerospace, and military customers.
Know-how
Nuclear Instrumentation
The Exosens brand builds on the combined expertise of Photonis and Centronic—two industry pioneers with decades of experience in nuclear safety instrumentation. Our comprehensive portfolio includes neutron and gamma detectors, as well as transmission lines, designed for use in nuclear power plants, fuel reprocessing facilities, waste storage monitoring, and nuclear research applications. Compatible with various reactor types, our advanced detection technology withstands high radiation, extreme pressures, and LOCA (Loss of Coolant Accident) conditions, ensuring reliability in demanding environments.
Exosens solutions provide high-precision radiation detection, which is essential for reactor control, radiation monitoring, and nuclear safety. Our Gas-Filled Detectors provide accurate radiation measurements for reactor instrumentation and energy spectroscopy, supporting critical safety and operational functions. With installations in over 30 countries—including Argentina, Australia, Canada, China, South Korea, the United Kingdom, and the United States—Exosens detectors are trusted worldwide to safeguard nuclear facilities.
Alpha, Beta, and Gamma detection
Exosens provides advanced radiation detection solutions with Geiger-Muller tubes and ionization chambers, offering reliable detection of alpha, beta, and gamma radiation. Exosens’s Geiger-Muller tubes are engineered to detect various forms of radiation, including x-rays, across a broad energy spectrum ranging from tens of keV to tens of MeV. These halogen-quenched devices feature metal walls optimized for gamma detection and thin mica windows, designed to effectively detect alpha and beta particles. With dose rate capabilities reaching up to 10⁴ mGy/h, Exosens's Geiger-Muller tubes are built to perform in demanding environments. Additionally, Exosens offers customized variants tailored to specific customer requirements, integrating bespoke modifications and specialized testing to ensure optimal performance in unique applications.
Our ionization chambers provide superior long-term stability and durability, making them essential for environmental and area monitoring applications. Designed for precise dose rate measurement, these chambers are ideal for safety-critical environments that require accurate radiation assessment over extended periods. Some models incorporate re-entrant tubes, enabling the insertion of small radioactive sources, while others feature a central hole for passing sources through the chamber, facilitating isotope monitoring and dose calibration. These versatile designs ensure that Exosens’s ionization chambers meet the rigorous demands of radiation monitoring in nuclear facilities, research institutions, and safety-sensitive industries.
Silicon photodiodes
Designed in Croydon, UK, and backed by decades of industry expertise since the early 1970s, Exosens silicon photodiodes are manufactured in state-of-the-art facilities across Western Europe. After fabrication, they undergo final processing, assembly, and testing at Exosens’s Croydon facility, Centronic Limited, to ensure high quality and performance. While much of Exosens’s production focuses on custom detectors tailored to specific customer requirements, the company also offers a selection of standard geometries in industry-standard packaging. These off-the-shelf designs provide a reliable solution for prototyping and allow manufacturers to source standardized products from multiple vendors. Exosens photodiodes are used in a wide range of critical applications, including fiber optic communication, X-ray and radiation detection, medical diagnostics, industrial safety systems, and astronomy. Some diodes are also adapted for neutron detection in nuclear applications, demonstrating their versatility.
Exosens photodiodes are engineered for precise light detection, with external quantum efficiency ranging from 0.2 to 0.7 A/W over a spectral range of 200–1100 nm. In addition to light detection, Exosens manufactures specialized diodes for direct X-ray and charged particle detection, as well as indirect X-ray detection using scintillator assemblies. Each diode series is optimized through the selection of silicon type, junction depth, and manufacturing processes to meet specific detection requirements. Exosens works closely with customers to modify existing designs for specialized applications, ensuring optimal performance. With a strong commitment to innovation and precision, Exosens continues to deliver high-performance photodiodes for a wide range of industries and critical detection needs.