Material
HR-GaAs:Cr“TOP” sensing material
HR-GaAs:Cr sensor material
High-resistivity gallium arsenide compensated with chromium. A room-temperature material for direct-conversion X-ray detectors.
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Spectral photon-counting X-ray · HR-GaAs:Cr technology
Zeelta builds spectral X-ray technology on its own HR-GaAs:Cr semiconductor. The sensor counts every X-ray photon and measures its energy, so a single exposure shows both the structure of an object and its chemical composition.
- Sensor material
- HR-GaAs:Cr, room temperature
- Pixel pitch
- From 35 µm
- DQE at 40 keV
- Above 95%
- Detection
- Direct conversion, photon counting
Products
From sensor material to analysis
Sensor
X-ray sensors
Pixelated monolithic HR-GaAs:Cr sensors for spectral photon-counting detectors, prepared for flip-chip bonding to a readout chip.
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X-ray systems
Spectral X-ray systems for non-destructive testing and security screening, built on HR-GaAs:Cr detectors.
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Analytical software
Software for spectral image analysis in NDT: energy channels, element maps and AI-assisted composition analysis.
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X-ray goes from black and white to colour
Scintillator detectors have reached their physical limits. Direct photon counting adds a new dimension to every image: the energy of each photon.
Structure and chemistry in one scan
Energy-resolved counting shows the element composition of the object, not only its shape and density.
Higher spatial resolution
Resolution follows the pixel pitch, from 35 µm. Scintillator systems with a 110 µm pitch reach about 330 µm in practice.
Lower dose
Detective quantum efficiency above 90%, compared with 35 to 40% for a scintillator and photocell pair. Less harm to living specimens.
Finer density resolution
About 4,000 grey levels for each energy channel, independently. Routine radiography works with 256.
Applications
Who needs it
Medical diagnostics, security, material research, mining, radiation control and food quality control.
Industrial NDT
Inclusions in aluminium alloys, cracks in turbine blades and defects in composites, found by element composition.
Medical diagnostics
X-ray as functional diagnostic imaging: new methods for clinical research at lower dose.
Security
Luggage scanning prototype tested with the IATA standard test set to separate organic materials, metals and hazards.
News
Latest news
Zeelta launches its new website
The new zeelta.com presents Zeelta products, the science behind True Color X-ray, news and materials for investors.
Read moreHR-GaAs:Cr “TOP” material open to early adopters
Zeelta offers its HR-GaAs:Cr sensor material to early adopters: detector manufacturers, research groups and medical teams.
Read moreZeelta Oy founded in Helsinki
The team behind decades of research in radiation detection founded Zeelta Oy in Finland to bring HR-GaAs:Cr technology to market.
Read moreInvestors
Materials for investors and partners
Market, technology, competition, team and plans in one presentation. Zeelta is preparing a seed and Series A round.
Contact
Write to us
Questions about HR-GaAs:Cr material, sensors, spectral X-ray systems, joint research or investment. We reply within one business day.
Direct contacts
- Products, research and partnership
- vvv@zeelta.com
- Address
- Zeelta Oy, Annankatu 25 LH 44, 00100 Helsinki, Finland