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