Modern Single-Channel Analyzers for Scintillator-PMT Systems When you’re working with scintillator + photomultiplier-tube (PMT) radiation-detection systems, the counting electronics matter. The right single-channel analyzer (SCA) can streamline setup, reduce calibration burdens, and improve measurement reliability. In this post, we’ll walk through complementary SCA modules offered by Rotunda Scientific Technologies and how they address these lab challenges. Why Traditional SCAs Can Slow You Down Many labs still rely on separate modules for high-voltage supplies, preamplifiers, amplifiers, discriminators, and counting electronics. That often results in: Long setup times and complex wiring Manual adjustments on analog electronics that may drift Large physical footprint that reduces flexibility Minimal options for streamlined output integration Meanwhile, modern labs demand reproducibility, quicker turnaround, and fewer adjustments. The SCA you choose should support productivity — not slow it down. Meet the bPAD Series: Compact, Integrated SCAs Rotunda SciTech’s bPAD family consists of microcontroller-based single-channel analyzers designed to simplify detector integration. They mount on a standard 14-pin PMT base and include an internal high-voltage supply, amplification, discrimination electronics, and USB connectivity for software control. Below are the currently offered modules, with links to each product page. bPAD Single Channel Analyzer The base bPAD is a compact single-channel analyzer integrating: Charge-sensitive preamplifier + variable-gain amplifier + window discriminator Internal high-voltage supply (0–1500 V in 4096 steps) USB communication + configuration software Integral and differential acquisition modes TTL output pulses for each event counted Compact form: approx. 65 mm diameter × 71 mm high Very low power consumption (max ~1 W) By combining the high-voltage supply, amplifier, and discriminator in one module with USB setup, the bPAD reduces hardware overhead and setup time. View bPAD Product Page bPAD+ Single Channel Analyzer he bPAD+ includes the core functionality of the base bPAD.This model adds an analog output, offering increased flexibility when interfacing with external systems such as data-logging equipment or other electronics. View bPAD+ Product Page bPAD+ VR Single Channel Analyzer The bPAD+ VR builds on the bPAD+ by allowing its analog output to be configured as: Pulsesor A variable voltage proportional to the discriminated count rate This makes the + VR ideal for real-time monitoring applications, including flow systems and HPLC environments. It maintains USB configuration, compact size, full SCA functionality, and integrated high-voltage capability. View bPAD+ VR Product Page How Labs Are Using These SCAs Faster detector setups Mounting the module directly on the scintillator + PMT base enables simple integration and USB-based configuration — reducing setup time and saving bench space. Multi-channel arrays & modular builds Because the modules are compact, it’s feasible to deploy several detector channels. Model variations support different output needs as systems scale. Process monitoring & count-rate feedback For applications requiring live feedback — such as flow counting or real-time characterization — the bPAD+ VR model provides analog voltage proportional to count-rate, enabling read-outs or control signaling. Integration Tips & Technical Highlights Choose your PMT/scintillator combination (e.g., NaI(Tl), LaBr, CeBr) compatible with the internal HV supply (0-1500 V). Use USB software to scan your energy window (“pseudo-PHA”) to identify your region of interest and adjust discriminator bounds. Select the output type required: ◦ TTL only → bPAD ◦ TTL + analog → bPAD+ ◦ Configurable analog proportional to rate → bPAD+ VR Small form factor (~56 mm Ø × 71 mm H) and low power (~1 W) simplify installation into compact lab or field systems. Ready to Upgrade Your Counting Chain? If you’re ready to simplify your detector setup, reduce calibration overhead, and scale your channel count — the bPAD series offers a compact, integrated solution. Choose the model that fits your output and integration needs, and let your electronics support your measurements, not slow them down. Explore the Full SCA Series Sources Rotunda Scientific Technologies — bPAD Single Channel Analyzer Rotunda Scientific Technologies — bPAD+ Single Channel Analyzer Rotunda Scientific Technologies — bPAD+ VR Single Channel Analyzer Rotunda Scientific Technologies — Single Channel Analyzer collection This article was written in part with the assistance of AI to help organize, summarize, and reference publicly available information.
