oneSystem composition

Wide energy low background high-purity germanium detector, liquid nitrogen condensation refrigeration machine, low background lead chamber, digital multi-channel spectrometer, automatic sample changing high-purity germaniumγSpectrometer integration software, energy spectrum analysis software, passive efficiency calibration software, robot arm automatic sample changer, sample stage, barcode reader, barcode printerCable.

2、 Product application

The automatic sampling system is used for measuring and analyzing radioactive isotopes in various environmental samples, such as rocks, minerals, sludge, slag, soil, plants, sediments and particulate matter in air and water. The automatic sample changing spectrometer systemγSpectral measurement determines the types and activities of radioactive nuclides in the sample. The fully automated sample converter allows users to measure up to40This reliable robotic sample changer improves measurement efficiency and reduces the health risks for operators, without the need to manually operate the spectrometer.

3、 Product Technical Specifications

1Wide energy ultra-low background high-purity germanium detector

• Relative efficiency: greater than70%；
• Energy resolution: less than2.0keV（@1332.5keV）；
• ⦁ Energy range:3keVarrive10MeV；
• ⦁ Packaging: Beryllium window(Or carbon fiber)Encapsulation, separation of preamplifier and detector crystal;
• Peak Kang ratio: greater than68:1.

2 Liquid nitrogen reflux refrigeration machine

• One bottle of liquid nitrogen can support continuous operation1Over years old;
• ⦁ Lifespan: greater than12Ten thousand hours;
• ⦁ Noise: at a distance1Less than meters60Decibel;
• The impact on energy resolution: in59.5keVless than15eV；
• The impact on the time of death: less than1%；
• Provide status monitoring software, which monitors the status including liquid level, pressure, cold head temperature, operating power, etc.

3 Low background lead chamber

• ⦁ Outer layer material:1cmLow carbon steel;
• Middle layer material:10cmLow background lead4πDirectional shielding;
• Inner layer material:3 mmOxygen free copper, absorbingXRadiation;
• ⦁ Compression bar type top sliding door design;
• ⦁ Load bearing table material: low carbon steel;
• ⦁ Floor area:65cm x 65cm；
• Internal cavity size: Φ307mm x 404mm；
• ⦁ Weight: greater than1.1Ton;
• Equipped with an automatic control motor, programmable opening and closing of the lead chamber.

4Digitized Multi Channel

• ⦁ Maximum data pass rate: greater than100kcps；
• ⦁ Coarse adjustment gain:1,2,4,8,16,32,64；
• Fine tuning gain:0.45arrive1；
• ⦁ Maximum road location:16384；
• ⦁ Forming time constant: rise time from0.8to26usAdjustable, per step0.2us; Flat top time from0.5to2.0us，Every step0.1us；
• ⦁ Linear: Integral Nonlinear≤±0.025%Differential nonlinearity≤±1%；
• ⦁ Temperature coefficient: gain<35ppm/°CZero point<3ppm/°C；
• Signal processing: It has functions such as digital spectrum stabilization, automatic pole zero, and digital gate baseline recovery;
• ⦁ Data storage:16384Do not lose data storage, each track has a capacity of2³¹-1Counting;
• ⦁ Automatic digital zero adjustment;
• Counting rate table: Real time display on the screen;
• ⦁ Communication interface:USB。

5、Automatic sample replacement of high-purity germaniumγSpectrometer integration software

• Including energy spectrum analysis, robotic arm controlProcess management and other functions, integrated into a software platform;
• ⦁ Spectrometer control: achievable parameter settings include: fine gain adjustment, starting digital spectrum stabilization, adjusting high voltageDisplay actual time/Live time, setting upper and lower discrimination thresholds, etc;
• ⦁ Energy Scale: Accurately locate peak positions through unimodal fitting, and users determine peak position pairs based on prior knowledgeThe software provides real-time query function for nuclide peak information of the corresponding energy;
• Peak finding: Using first and second derivative methods to find isolated peaks, and based on peak shape fitting, usingMariscottiMethod: Perform secondary peak searching to determine the peak position of the heavy peak;
• Efficiency Scale: The software provides two functions: one is to call the efficiency scale curve obtained from experimental measurements, and the other isThe calculation results of the passive efficiency calibration software seamlessly connected to this software;
• Peak fitting: Subtract background through peak fitting, distinguish heavy peaks, and obtain net count rate. Equipped with heavy peak analysis functionBy using numerical calculation methods such as quasi Newton method and Monte Carlo method, accurate analysis can be achieved20Heavy peak. Using non-linear methodsThe background subtraction method automatically adapts to the changing trend of the energy spectrum. peakForm using Gaussian function or Gaussian function before additionThe tail fitting peak shape of the post exponential function has excellent fitting ability for distorted peak shapes;
• ⦁ Activity calculation: For different gamma peaks of the same nuclide, taking into account the branching ratio and efficiency scale factor, the method is appliedCalculate activity through weighted averaging. Simultaneously considering the decay and death of nuclides during the measurement process in the activity calculation processInter correction, etc;
• ⦁ Minimum detectable limit calculation: built-inCurrie MDA，KTA MDA，PISO MDA，Critical levelWaiting for analysis methods to choose from;
• ⦁ Analytical nuclide library: fromENSF（Evaluated nuclear structure data filehave3000manyThe spectral line system of radioactive isotopes allows users to query spectral line information in real-time during use;
• ⦁ Equipped with fully automatic analysis function;
• ⦁ UseUsers can intuitively see the comparison between the fitting results and the original data;
• ⦁ Interface: Full Chinese interface.

6Passive efficiency calibration software

• ⦁ Full Chinese interface;
• ⦁ CADModeling;
• ⦁ Represented energy range:3keVarrive10MeV；
• The characterization of the detector and the characterization experiment should be completed at a national first level metrology station.

7、Robot arm automatic sample changer

• Six axis robotic arm;
• ⦁ Payload:3kg；
• ⦁ Distance reached: maximum1200mm；
• Accuracy:：±0.01mm；
• All machines and devices are enclosed.

8、sample stage

• ⦁ Can be placed and fixed at least50A sample;
• ⦁ Sample box size can be customized;
• The height and size should match the robotic arm.

9Barcode reader

• ⦁ CCDBar code scanner;
• ⦁ Resolution greater than512Pixel;
• ⦁ USBInterface;
• The barcode value, sample number, and energy spectrum file name are consistent.

10、Bar Code Printer

• ⦁ Printing width:3Inches;
• ⦁ Printing accuracy:300dpiabove;
• ⦁ Interface:USBInterface.

11Cable

• ⦁ Greater than5Rice;
• Has electromagnetic shielding capability.