Preamplifiers for Radiation Detectors

First-stage electronics for radiation detection signal processing chain
Designed to extract weak detector signals with minimal noise degradation
Available types:

• Charge-sensitive preamplifiers (most common for spectroscopy)
• Current-sensitive preamplifiers
• Parasitic-capacitance preamplifiers
• Ultra-low noise design for high energy resolution performance

Compatible with:

• HPGe detectors
• Silicon detectors
• Scintillation detectors (PMT-based systems)

Models optimized for low, medium, and high detector capacitance
Fast timing outputs available (rise time <5 ns for some models)
Options with integrated PMT base, HV supply, and fast timing electronics
Suitable for both laboratory and field-based systems

Preamplifiers are the critical first-stage electronics in any radiation detection system, responsible for converting the extremely weak signals generated by detectors into usable electrical pulses for further processing.

Their primary function is to capture and amplify the initial signal without degrading the signal-to-noise ratio, ensuring that the intrinsic performance of the detector is preserved.

In most nuclear spectroscopy systems, preamplifiers are located as close as possible to the detector, often integrated directly into the detector assembly or housing. This minimizes noise and signal loss, which is essential for achieving high-resolution measurements.

The most widely used type is the charge-sensitive preamplifier, which integrates the charge generated by radiation interactions and converts it into a voltage pulse proportional to energy.

ORTEC provides a comprehensive portfolio of preamplifiers tailored to different applications:

Charge-Sensitive Preamplifiers (e.g., 142 Series)
→ Optimized for semiconductor detectors with ultra-low noise and high precision
Scintillation Preamplifiers (e.g., Model 113)
→ Designed for PMT-based detectors (NaI, plastic scintillators)
Fast Preamplifiers (e.g., 9301, 9305, 9306, VT120)
→ Ultra-fast response for timing and coincidence measurements
Integrated PMT Base + Preamplifier Systems (e.g., 276, 296 ScintiPack)
→ Compact, all-in-one solutions combining HV, preamp, and signal output

These preamplifiers are engineered to deliver low noise, fast response, and high stability, forming the foundation for accurate signal processing in spectroscopy systems.

Product Type: Preamplifier (Front-End Electronics)
Function:

• Signal extraction from detector
• Initial amplification
• Signal conversion (charge → voltage pulse)

Preamplifier Types:

• Charge-sensitive
• Current-sensitive
• Parasitic-capacitance

Input Compatibility:

• Semiconductor detectors (HPGe, Si)
• Scintillation detectors (PMT-based)
• Proportional counters

Noise Performance: Ultra-low noise (optimized for high-resolution spectroscopy)
Rise Time:

• Fast timing output <5 ns (model dependent)
• Bias Voltage Handling:
• Up to ±1 kV (model-dependent)

Output Signals:

• Energy signal (slow output)
• Fast timing output (optional)

Integration Options:

• Standalone preamplifier modules
• Detector-integrated preamps
• PMT base with built-in preamp

Power Consumption:
Low power (~1–2 W typical for detector-integrated models)

• Gamma spectroscopy (HPGe, NaI systems)
• Alpha and beta particle detection
• Nuclear and particle physics experiments
• Detector signal conditioning for MCA and SCA systems
• Time-of-flight (TOF) and coincidence measurements
• Environmental radiation monitoring
• Accelerator and beamline instrumentation