NUWA-SP Digital Unfolding MCA

　　NUWA-SP Digital Unfolding MCA

　　Introduction

　　The NUWA-SP Digital Unfolding MCA produced by Jiechuang Nuclear Instruments (Beijing) Technology Co., Ltd. is a 100% domestically-made tube-socket integrated system, mainly used for spectrum readout of various scintillation detectors such as NaI, LaBr3, BGO. Full waveform sampling technology directly digitizes preamplifier signals, with integrated high-voltage control, zero adjustment, gain adjustment, and temperature acquisition. The acquired spectrum data completes unfolding function within the MCA.

　　The built-in peak stabilization program can maintain peak position stability for a long time. It uses Gaussian fitting + step function for net peak area calculation and can return unfolding results in real time. Users can perform nuclide identification and activity calculation based on unfolding results.

　　Hardware

　　| 3 coarse gain ranges software adjustable, 0.5~1.5 fine gain software adjustable;

　　| Digital pile-up rejection, digital baseline restoration;

　　| High voltage digitally controllable;

　　| Variable gain: 1024, 2048, 4096 channels software adjustable;

　　| Integral nonlinearity < +-0.02%, differential nonlinearity < +-0.8%;

　　| Count throughput: 200Kcps;

　　| Stable and reliable for long-term operation, zero drift less than 1 channel in 72 hours, gain instability less than 0.2% in 72 hours;

　　| Zero temperature coefficient: less than 0.2 channels/℃; gain temperature coefficient: less than 0.1%/℃;

　　| Power supply: +12V, power consumption: less than 2W;

　　| Two groups of RS485 output, one for standard Modbus RTU output, one for upper computer debugging, both RS485 channels can work simultaneously for easy debugging and comparison;

　　| Long communication distance, tested reliable communication over 60 meters;

　　| Fast system response, can get unfolding results within 7 seconds after power-on;

　　| Built-in fully digital peak stabilization program, can stabilize specific energy peaks digitally. Peak drift ≤ 1 channel over 24 hours continuously;

　　| Can perform energy calibration and efficiency calibration, key parameters stored offline;

　　| Can perform digital unfolding, can specify energy ROI to calculate net peak area and nuclide identification, can output net peak area or increment information;

　　Spectrum Analysis Software Features

　　| Full English spectrum analysis software, can run on Windows or Kylin operating system;

　　| Uses Gaussian fitting + step function for net peak area calculation, fitting results displayed graphically in real time;

　　| Can simultaneously obtain unfolding results from MCA and real-time unfolding results from upper computer software for easy debugging and comparison;

　　| Can perform energy calibration, efficiency calibration, energy ROI selection through upper computer, and parameters can be sent to MCA for offline storage;

　　| Can start peak stabilization program, can specify peak stabilization energy and ROI, parameters sent after enabling;

　　| Can read actual temperature inside the probe;

　　| Nuclide library: built-in nuclide library, supports user-defined nuclide library;