Application for
nuclear spectral analysis
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This application for analysis of high-resolution
gamma-ray spectra has been developed using non-linear fitting techniques to fit full-spectrum nuclide shapes. -
In contrast to conventional methods based on the results of an initial peak-search, the VRF
analysis method forms a spectrum-wide shape for each nuclide as well as user-enabled parameters of energy calibration, attenuation or self-absorbing materials and coincidence summing until no better fit to the data can be
obtained. -
This approach allows identification of minor peaks that are masked by larger, overlapping peaks that would not otherwise be possible.
In research, radiation protection and industry
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Universities, research centers, nuclear medicine
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Industry- and nuclear technology
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Dismantling, consulting, waste management
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Environmental, health and food surveillance and laboratories
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Civil defense, emergency response, border, safety, security and access control
A new powerful method of high-resolution gamma-ray spectral analysis:
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A spectrum-wide shape is formed for each nuclide with activity adjusted at each iteration
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For all nuclides the full-spectrum shapes are summed and automatically repeated for best fit
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VRF is visually-driven for reporting, graphing and specialized analysis
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Detector energy, resolution and efficiency calibrations best fitting by up to 6-order Pàde
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High sensitive identification of minor peaks that are masked by larger overlapping peaks
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Automatic activity correction for decay during acquisition & collection and since collection
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Automatic random & true-coincidence summing and single, double and x-ray escape corrections
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Three different attenuation groups are selectable including low-energy peak-tail fitting
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Applicable to activation analysis for prompt and delayed neutrons
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Implemented calculation of isotopic ratios, e.g. for U-235/U238 or Pu-240/Pu-239
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Editable libraries (txt-files) for 1180 isotopes (3840 in preparation), selectable decay sequences (chains), all x-rays, 183 neutron activated nuclides and customizable groups of isotopes
The percentage by weight reference for depleted uranium
is U235/U238=0.200
Example: Isotopic ratios
Isotopics is the estimate of the percentage by weight or percentage by atom of a selected isotope to the sum of all isotopes of a selected element. Two important measurements of isotopics are the percentage by weight of U-235 in uranium, and the percentage by weight of Pu-240 in plutonium.
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VRF offers a simple way to estimate isotopics for cases in which the element is almost entirely composed of two isotopes, using the Isotopics tab page shown here for depleted uranium.
- Non linear -
Least-Squares Fitting Techniques
for Gamma Spectrometry"
"After 40 years γ-spectrometry"
Finally a complete analysis of high resolution HPGe spectra
The latest generation in γ-spectra analysis