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NL-GSM100 Gamma Surveymeter & Spectrometer
The NL-GSM100 combines handheld gamma surveying and spectroscopy with a NaI(Tl) detector, SiPM readout and Android connectivity for real-time radiation monitoring and analysis.A 1″ × 1″ thallium-doped sodium …
- Detector1″ × 1″ NaI(Tl) + SiPM
- Spectrum channels4096 (12-bit ADC)
- Host compatibilityAndroid 7.0+ via USB OTG; PC via USB serial
Overview
The NL-GSM100 combines handheld gamma surveying and spectroscopy with a NaI(Tl) detector, SiPM readout and Android connectivity for real-time radiation monitoring and analysis.
A 1″ × 1″ thallium-doped sodium iodide scintillator is coupled to a silicon photomultiplier, removing the need for a photomultiplier tube and its high-voltage supply. The integrated signal chain combines a transimpedance amplifier, shaping amplifier, peak detector and 12-bit ADC to acquire a 4096-channel gamma spectrum.
Connect to a compatible Android 7.0+ handset or tablet using USB OTG, or to a PC with USB serial support. Counter mode provides real-time counts per second and dose-rate readings, with configurable dose thresholds, audible alarms and visual indicators.
The Android application displays live spectra with linear or logarithmic scaling. Savitzky–Golay smoothing, continuous wavelet transform peak detection, baseline correction and FWHM measurement support spectrum analysis. User-defined energy calibration and a built-in isotope reference library support manual peak identification.
Capture spectrum screenshots and share them using the Android share sheet. A built-in serial terminal supports diagnostics and direct hardware interaction, while I2C, SPI, UART and GPIO headers support OEM integration.
Applications include environmental and background radiation monitoring, laboratory and facility surveys, NORM/TENORM screening, scrap-metal and cargo screening, emergency response, and research and teaching.
The catalogue package includes the NL-GSM100 detector head with 1″ × 1″ NaI(Tl) crystal and SiPM, a USB OTG cable, the Android application, a 6000 mAh rechargeable battery pack, energy calibration and configuration files, and a quick-start and operating guide. Alternative scintillator types, sizes, display options and enclosure configurations are available on request.
Specifications
- Detector 1″ × 1″ NaI(Tl) + SiPM
- Spectrum channels 4096 (12-bit ADC)
- Host compatibility Android 7.0+ via USB OTG; PC via USB serial
- Measurement modes Real-time CPS, dose rate and gamma spectrum
- Photodetector Silicon photomultiplier; OnSemi MICROFC-series reference
- Signal chain SiPM → transimpedance amplifier → shaping amplifier → peak detector → 12-bit ADC
- Energy resolution <8% FWHM (catalogue typical value; reference energy and test conditions not specified)
- Validated gamma lines Am-241: 59.54 keV and 26.35 keV peaks resolved with NaI(Tl)
- USB interface USB Full Speed, CDC serial, micro-USB
- SiPM bias On-board adjustable boost converter, 27.5–33.8 V
- ADC reference 3 V internal precision reference
- Processor Dual-core ARM Cortex-M33, up to 150 MHz
- On-board flash 4 MB for firmware and spectrum storage
- Typical power consumption Approximately 75 mW at 5 V, as stated in the catalogue
- Battery 6000 mAh or greater; catalogue package includes a 6000 mAh rechargeable pack
- Android display 6.5″ or larger, for spectrum and dose-rate viewing
- Alarms Configurable dose thresholds with audible and visual alerts
- Spectrum display Live spectrum with linear/logarithmic Y-axis
- Spectrum processing Savitzky–Golay smoothing, CWT peak detection, noise estimation, peak grouping and baseline correction
- Resolution analysis FWHM calculation
- Energy calibration User-defined calibration points mapped to known gamma energies
- Isotope identification Built-in isotope reference library for manual peak identification
- Export and sharing Spectrum screenshots and Android share sheet
- Diagnostics Built-in serial command terminal
- Expansion headers I2C, SPI, UART and GPIO
- OLED support SSD1306 and SH110x via I2C
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