How are you searching for radioactive materials in the field?
10th June 2026
At a glance
> In our newest video, Nuclear & Industrial Sector Manager Sarah Lonsdale demonstrates the H3D A400.
> It is a highly sensitive handheld Radioisotope Identification Device (RIID) that uses a CZT detector in a lightweight design for single-handed operation.
> It can identify sources within seconds and localise them in under two minutes using 360-degree isotope-specific directionality.
Ideal for security, defence, nuclear energy, and environmental monitoring
By using an advanced pixelated cadmium zinc telluride (CZT) detector, the A400 allows first responders, radiation protection engineers and armed forces personnel to quickly identify and locate radioactive sources.
Its CZT detector provides excellent energy resolution (less than 1% FWHM at 662 keV) without the need for cryogenic cooling. This means users can identify unknown radioactive sources from their unique radiological signature using a lightweight instrument that can be operated comfortably in one hand.
Quickly assess potential hazards from a range of sources
With an energy range spanning from 50 keV to 3 MeV, the A400 can identify a wide variety of radioisotopes. This enables operators to quickly assess potential hazards from common medical and industrial sources, as well as other threat radionuclides.
The RIID combines high energy resolution, excellent detection efficiency and real-time directional capabilities. Thanks to its 360-degree isotope-specific directionality, it not only identifies radioactive materials but also indicates the direction of origin, helping users locate sources quickly and efficiently.
Ready to use in less than 90 seconds
The A400 is ready for operation in less than 90 seconds, allowing users to respond quickly, and features an integrated User Interface that clearly displays isotope identifications, dose rates, spectra, and system status information.
The system can detect and identify radioactive sources in real time. For example, it can detect a 0.37 MBq Caesium-137 source at a distance of 1 metre in less than 22 seconds and can localise the source in under two minutes.
A sensitive instrument with a robust housing
Built to withstand challenging environments, the A400 operates in temperatures ranging from -20 °C to 50 °C and is rated to IP65. With more than eight hours of battery life and compliance with ANSI N42.34 standards, it offers dependable performance during extended use.
Find out more
You can learn more about the H3D A400 by watching our video or clicking the button below to speak to a product specialist directly.