Photomultiplier Tube (PMT) Bases

• Essential component for scintillation detector systems using PMTs

• Provides high-voltage distribution to PMT dynodes and electrodes

• Converts light signals into electrical pulses for spectroscopy and counting

• Available in multiple configurations:

• Standard voltage divider bases

• Bases with integrated preamplifier

• Bases with built-in high-voltage supply

• Fully integrated digital MCA + DSP systems

• Compatible with NaI(Tl), plastic scintillators, and other PMT-based detectors

• Models support timing, energy measurement, and single-photon counting

• USB and Ethernet-enabled digital bases available (DigiBASE series)

• Compact, low-power designs suitable for portable and field applications

Photomultiplier Tube (PMT) Bases are critical electronic components used in scintillation-based radiation detection systems, responsible for powering and interfacing with photomultiplier tubes. When radiation interacts with a scintillator (e.g., NaI(Tl)), it produces light pulses. These light signals are converted into electrical signals by the PMT, and the PMT base plays a key role in: Distributing the required high voltage across PMT dynodes Extracting and shaping the output signal for further processing ORTEC offers a comprehensive range of PMT bases designed for different levels of system integration: Standard Bases (e.g., 265A, 266, 269) → Provide voltage division and signal output for timing and spectroscopy Bases with Preamplifier (e.g., 276, 276L) → Include low-noise signal amplification for improved performance Integrated Systems (e.g., 296 ScintiPack) → Combine HV supply + preamplifier + compact design for simplified setup Digital PMT Bases (e.g., DigiBASE, DigiBASE-E) → Fully integrated high voltage + preamp + MCA + DSP + software in one unit These solutions enable users to build anything from basic counting systems to fully digital gamma spectroscopy systems, depending on application requirements.

Product Type: Photomultiplier Tube (PMT) Base Function:

• High voltage distribution (dynode chain biasing)

• Signal extraction and conditioning

• Optional amplification and digitization

PMT Compatibility:

• 10-stage, 12-stage, and 14-stage PMTs

• 14-pin, 20-pin, and 21-pin socket configurations

Output Types:

• Anode output (timing signal)

• Dynode output (energy signal)

Voltage Supply:

• External HV supply (standard bases)

• Integrated HV (up to ~1200 V for digital bases)

• Integrated Features (model dependent):

• Low-noise preamplifier

• Adjustable focus control

• Digital Signal Processing (DSP)

• Multichannel Analyzer (MCA)

• USB / Ethernet interface

Power Consumption: Low-power designs (~240 mW for integrated models) Form Factor:

• Compact, lightweight cylindrical base design

• Direct mounting on PMT

• Gamma spectroscopy using scintillation detectors (NaI, LaBr)

• Nuclear and radiation detection systems

• Environmental radiation monitoring

• Homeland security and isotope identification

• Medical imaging and radiation measurement

• Research in nuclear and particle physics

• Portable and field-based radiation detection systems