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PIONEER ENERGY
Ultra-Low Background Anti-Compton Anti-Cosmic Ray HPGe γ Spectrometer

I. Product Introduction

The Model ACACR-HPGe Ultra-Low Background Anti-Compton Anti-Cosmic HPGe γ-Ray Spectrometer consists of a wide-range ultra-low background high-purity germanium detector, anti-Compton annular detector, anti-Compton plug detector, anti-cosmic ray detector, anti-coincidence electronics system, environmental gamma shielding assembly (lead, copper, cadmium liners, etc.), digital multi-channel analyzer, automatic lifting platform for detector assembly, liquid nitrogen recondensation refrigerator, gamma spectrometry analysis software, and passive efficiency calibration software.

II. Product Functions

Anti-Compton spectrometers and anti-cosmic ray spectrometers serve distinct application scenarios. Anti-Compton technology suppresses the Compton continuum in environments with intense high-energy radiation, revealing characteristic peaks in the low-energy region and effectively reducing the detection limit for low-energy characteristic γ-rays. Anti-cosmic ray technology minimizes the background contribution from cosmic rays and other sources, making it ideal for ultra-low level radioactivity measurements.


The ACACR-HPGe spectrometer integrates both anti-Compton and anti-cosmic ray functions in a single unit, significantly enhancing the comprehensive performance of HPGe gamma spectrometry systems.
1. Wide-energy, ultra-low background, high-purity germanium detector
⚫ Packaging: Beryllium window, carbon window, or aluminum window optional; preamplifier separate from detector crystal.
⚫ Relative efficiency: 50% to 170% selectable;

2. Anti-Conseid ring detector
⚫ NaI ring detector;
⚫ Includes 4 photomultiplier tubes and voltage divider/high-voltage circuitry, integrated with the detector crystal in a single package;

3. Anti-Conseid detector
⚫ NaI ring detector;
⚫ Photomultiplier tube with high-voltage and voltage divider modules, integrated with the detector crystal in a single package;

4. Anti-cosmic ray detector
⚫ Large-area plastic scintillator detector, integrated with photomultiplier tubes, covering the sides and top of the lead chamber.

5. Anti-coincidence Electronics Module
⚫ Supports 7 anti-coincidence inputs;
⚫ Retains both coincidence and anti-coincidence output interface modes;
⚫ Provides 7 high-voltage outputs, adjustable from 0V to 1200V;
⚫ Provides 7 low-noise, low-voltage power supply outputs, with a minimum output voltage of 12V;
⚫ Built-in baseline recovery module ensures baseline stability at high count rates.

6. Detector Assembly Automatic Lifting Platform
⚫ Supports the liquid nitrogen recondensation refrigerator and detector;
⚫ Automatic lifting control circuit.

7. Cooler and Refrigeration Unit
Optional: LN-2 liquid nitrogen recondensation refrigerator manufactured by Pioneer PETRONUC., with some of its functions as follows:
⚫ Cooling type: Liquid nitrogen recondensation refrigeration with an electrically powered refrigeration unit;
⚫ Indicates liquid nitrogen level and pressure information and generates an alarm, with RS485 or USB interface;
⚫ Liquid nitrogen can support the detection system to operate continuously for more than seven days without power;
⚫ With continuous power supply, liquid nitrogen can support the detection system to operate continuously for more than two years;
⚫ The energy resolution of the instrument remains stable during the cooling process;
⚫ No low-energy noise is generated during the cooling process.

8. Shielded Lead Chamber

⚫ Low-background lead monolithic casting;

9. Multichannel Pulse Amplitude Analyzer and Electronic Instruments
Taking the GammaSpectrum-1 digital multichannel analyzer manufactured by Pioneer PETRONUC. as an example, its functions are as follows:

⚫ Crystal temperature monitoring and high-voltage protection function (high voltage is shut off based on the indication of the internal temperature sensor of the detector), spectrum stabilization function, automatic voltage increase function;
⚫ Automatic zeroing and digitally gated baseline recovery function;
⚫ Pulse anti-cumulative function;

⚫ Lower Domain Level Discrimination (LLD) function.


10. Gamma Spectrum Analysis Software

Optionally, you can use the GammaSharp gamma spectrum analysis software [GammaSharp] V2.0 from Zhongzhi He'an. This software integrates hardware control, spectrum acquisition, data analysis, report generation, and quality control. It uses fully automated analysis as its navigation tool and outputs analysis results based on selective, precise, and interactive analysis. It can run normally on any version of the Windows operating system.


It has the following main functions:

⚫ Spectrometer Control: Allows for parameter settings including fine-tuning of gain, adjustment of high voltage, display of real-time/activity time, and setting of upper and lower discrimination thresholds;

⚫ Parameter setting functions, including energy calibration, efficiency calibration, nuclide identification, spectral analysis (peak finding, peak area calculation), automatic decay correction and MDA calculation, quality control functions (background subtraction, efficiency-corrected weighted average activity calculation, efficiency quality control chart, parent-daughter decay correction, cascade coincidence summation correction, etc.), and automatic or manual spectral stripping;

⚫ Efficiency Calibration: Automatically calculates efficiency calibration curves for filter membrane samples containing dust, and can also directly call calculation results from passive efficiency calibration software;

⚫ Peak Fitting: Features peak repetition resolution;

⚫ Activity Calculation: Offers fully automatic activity calculation;

⚫ Fully automatic analysis function, including peak finding;

⚫ Real-time Analysis: The sidebar provides real-time fitting of the selected peak position, real-time nuclide identification, and peak area calculation;

⚫ Energy Calibration: Supports both manual calibration and fully automated calibration using a nuclide library;

⚫ Nuclide Identification: Provides nuclide identification results and calculates activity, along with nuclide energy peak interference results;

⚫ Activity Calculation: For different γ peaks of the same nuclide, considering both branching ratio and efficiency calibration factor, the activity is calculated using a weighted average. Nuclide values exceeding the detection limit are marked. Activity calculations provide activity results and related information for all nuclides in the nuclide library;

⚫ Detection Limits: Built-in analytical methods such as CurrieMDA, KTAMDA, PISOMDA, and Criticallevel are available for selection, with detection limits provided for each nuclide;

⚫ Quality Control: Supports nuclide activity quality control and peak drift quality control;

⚫ Information Tracking: All analytical results and parameters are saved in the spectral file;

⚫ Nuclide Library Editing: Based on ENSF (Evaluated Nuclear Structure Data File), it contains spectral systems for over 3000 radioactive isotopes. It allows setting up a library of 100 commonly used nuclides and an extended library. The software includes the nuclide library and corresponding gamma-ray energy data. Users can further edit and generate custom sub-libraries. The software's nuclide library supports querying by nuclide name, mass, and energy, and supports editing of parent and daughter nuclei. Users can locate peak positions to query nuclide information during use;

⚫ The software interface is in Chinese; 

⚫ Energy Spectrum Acquisition and Display: Features simultaneous acquisition of multiple spectra; fully automatic quantitative analysis, interactive analysis of odd peak shapes, quantitative analysis of multiple peaks (up to 20 multiple peaks);

⚫ The software has precise cascade coincidence summation correction function;

⚫ Measurement result alarm thresholds can be set;

⚫ Uncertainty Analysis: Comprehensive calculation of detection efficiency uncertainty and count rate uncertainty to provide the uncertainty of energy spectrum measurement results;

⚫ Access Control Function: User classification, hierarchical management of different user types' permissions;

⚫ Report Output: Outputs reports in TXT, PDF, HTML, and Excel formats, with customizable output formats.

Figure 1. ACACR-HPGe type ultra-low background high-purity germanium gamma spectrometer.
Figure 2 Main interface of energy dispersive spectroscopy (EDS) analysis software
11. Passive Efficiency Calibration Software

  • Optional software includes Gammacalib detector passive efficiency calibration software [Gammacalib] V4.0, developed and manufactured by Beijing Zhongzhi Nuclear Safety Technology Co., Ltd. This software allows input of sample characteristic parameters (including geometric, material, and density parameters), setting of the relative position parameters between the sample and detector, and setting of the geometric and material parameters of the surrounding shielding material. Validated on 200 samples, the software features the following:
  • Sample Modeling: Utilizes powerful CAD software for rapid 3D visualization modeling of volume sources of arbitrary shapes, such as cylinders (coaxial and non-coaxial), Marin cups, spheres, pipes, and frustums;
  • The distance from the radiation source to the detector can range from 0 to infinity, and modeling can be performed at any incident angle with accurate results;
  • Integral control accuracy can be manually adjusted; the software default value is 3%;

  • Built-in parameters from H to Pu The database of photonic microscopic interfaces includes materials such as gold, aluminum, germanium, copper, brass, magnesium, carbon fiber, polyester film, alumina, magnesium oxide, silicon, plastics, glass, water, calcium carbonate, air, alcohol, cellulose, cement, epoxy resin, fly ash (produced from lignite combustion), granite mineral oil, plexiglass, polyethylene, polyvinyl chloride, river sediments, sand (silicon dioxide), seawater (salinity 3.5%), soil (dry), and wood. It allows for the definition of materials with arbitrary components and allows manual addition.

  • Efficiency Scale Curve Calculation Time: For symmetrical sources (such as environmental samples), the calculation time is less than 20 seconds. For asymmetrical sources, the calculation time is generally less than 10 minutes.
  • Access Control Function: User classification and hierarchical management of permissions for different user types.
  • Data Output Software Function: Supports data output in Excel, TXT, PDF, and other formats, and has LIMS connectivity.

  • Chinese Interface

Figure 3 Typical passive efficiency calibration curves (language can be customized)
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