Alpha Spectrometer α8


Alpha Spectrometer α8 is intended for transformation of alpha-particle energies into electrical signals, their amplification, filtration, transformation and acquisition and further spectra processing with determination of intensities of spectral lines. Bench top Alpha Spectrometer α8 contains 8 measurement chambers which enables simultaneous analysis of up to eight samples. Every Alpha Spectrometer chamber includes an alpha particle detector, pressure sensor and preamplifier of signals from the alpha detector.


Precise alpha spectroscopy is made possible by the silicon Ion implanted alpha particle detector. The thin entrance window of the detectors provides good energy resolution even when located in the proximity of the alpha radioactive source while also providing high efficiency registration of alpha particles.


  • 8 alpha spectrometry chambers with preamplifiers, electronics, valves, etc.
  • 8 alpha-particles detectors
  • Data acquisition and PC interface device
  • Built-in spectrometric device
  • Vacuum pump
  • SpectraLineADA analysis software
  • PC with emulation software
  • Documentation set


SpectraLineADA analysis software package enables:

  • Execution of spectra acquisition for a set time
  • Marking and selection of regions of interest and their examination on a separate plane
  • Increasing or reducing scale on horizontal and vertical axeis
  • Energy calibration of spectra on two known energies
  • Determination f centroids and area of peaks with background deduction and without background deduction
  • Estimation of energy resolution at one second and one tenth height of full absorption peak
  • Automatic serial spectra acquisition with automatic record on a disk
  • Print out of the spectrum window
  • Comparison of different spectra in one window simultaneously reducing or decreasing scale
  • Calculation of activities of alpha emitting radionuclides

The activity calculation module uses the parametric model line of the alpha-spectrum. Spectrum of every alpha-emitted isotope line is represented by the combination of asymmetric Gauss distribution, exponent and hyperbola. These functions are combined using the conditions of the function and its first derivative continuity. This model represents alpha-spectra of both thin and thick sources, and gives good results with alpha-spectra measured by spectrometers with HPGe detectors and ionization chambers. The model parameters and activity values are specified using the minimum condition of the modified χ2- functional. The parameters of the spectrum deformation are varied. The deformation is caused by summing of alpha particles and conversion electrons impulses. The processing results are displayed and represented in a report view. The report pattern is specified by user. The fitting results are displayed on the spectrum graphics as nuclides independent spectra for visual control of the fitting results. The peak pattern after the minimization procedure can be saved and used for the spectrum analyses by the SpectraLine methods. 
The detection efficiency calculation and label operations are realized. 
The measured spectra and processing results can be saved to database. 
This functionality enables to analyze the specified criterions convergence of the repeated measurements.


Energy range of detector operation, MeV3 – 8
Instrumental background, cps/hour< 2
Maximum input count rate, cps>10000
Detector sensitive area, mm2450
Detector thickness, µm400
Detector bias voltage, V50
Energy resolution for 5.49 MeV, keV< 20
Absolute detection efficiency at the distance of 5 mm from the sensitive area of the detector, %> 20


Count rate0-50 000 pulses/s
Shaping time constant, switchable1 µs
Variable gain coarse and fineUp to 500
Noise level (referred to the input)< 3 mV for 2 µs
Pole-zero adjustmentAvailable
Live time correctionAvailable
Opportunity to operate with pulse feedback preamplifierAvailable
Base line auto restorationAvailable
Gain stability<0.0075 %/s
Integral nonlinearity< 0.025 %


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