ULTRA & ULTRA-AS Silicon Charged Particle Detectors

• Industry-standard silicon detectors for alpha and beta spectroscopy
• Ultra-thin entrance contact (~500 Å) for superior energy resolution
• High geometric efficiency with <1 mm detector-to-window spacing
• Advanced ion-implanted silicon technology for stability and long-term performance
• Extremely low leakage current enables high-resolution measurements at short shaping times
• Gold-plated detector housing ensures durability and non-oxidizing contacts
• ULTRA-AS version optimized for ultra-low background alpha counting
• Compatible with modern alpha spectroscopy systems and vacuum chambers

The ULTRA and ULTRA-AS Silicon Charged Particle Detectors are high-performance alpha spectroscopy detectors designed for precise measurement of alpha and beta radiation in laboratory and research environments.

These detectors utilize advanced ion-implanted silicon technology, featuring an ultra-thin entrance contact (~500 Å) that maximizes energy resolution while maintaining high detection efficiency.

Their compact geometry, with less than 1 mm spacing between the detector surface and housing, ensures maximum geometric efficiency, making them highly effective for low-activity sample analysis.

The ULTRA-AS variant is specifically engineered for ultra-low background applications, using optimized materials and detector design to reduce background noise from cosmic radiation and environmental sources.

With features such as gold-plated contacts, advanced surface passivation, and low leakage current, the ULTRA series delivers high stability, long operational lifetime, and consistent high-resolution performance.

Detector Type: Ion-implanted silicon charged particle detector
Measurement Type: Alpha and beta spectroscopy
Entrance Window: ~500 Å boron-implanted ultra-thin contact
Active Area Range:

• ULTRA: 25 to 3000 mm²
• ULTRA-AS: 300 to 1200 mm²

Depletion Depth: ≥100 µm (up to 500 µm options)
Energy Resolution: High-resolution alpha spectroscopy (measured at 5.486 MeV)
Background Performance: ≤24 counts/day (typical system performance)
Detector Housing: Gold-plated can (non-oxidizing, high conductivity)
Operating Temperature Range: -30°C to +50°C
Bias Requirement: Positive bias voltage
Mounting Options: BNC, Microdot, or custom configurations

• Alpha spectroscopy (high-resolution radionuclide identification)
• Radiochemistry and isotope analysis
• Environmental radioactivity monitoring
• Health physics and contamination analysis
• Nuclear research and particle detection
• Low-level alpha counting (ULTRA-AS applications)
• Laboratory-based radiation measurement systems