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Software for radiation protection and internal dosimetry  
  

 
 
 

   

VMC in-vivo

 

The development of VMC in-vivo began in 1995 in the IRD, and the current version was finished in 2007. VMC in-vivo simulates mathematically the geometry of Whole Body Counter systems, transports photons through this geometry, and finally simulates the detection of the photons.

VMC in-vivo then calculates the calibration factor in Bq per cps for the chosen radionuclide, phantom, detector type and detector position.

VMC in-vivo also simulates the spectrum as would be obtained by a Multi Channel Analyser. The program has been extensively validated using comparisons of results of physical phantoms with known activities of radionuclides, and also through international intercomparisons.

The future

In the near future, it will be possible to modify the shape, height and mass of the phantoms available in VMC in-vivo, so that the mathematical phantom will become a closer approximation to the person under study.

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The IAEA intercomparison

VMC in-vivo obtained very good results during the IAEA Whole Body Counter intercomparison. The measurements were made at the IRD Whole Body Counter laboratory. The figure represents the simulation of Ba-133 in the BOMAB counted with a 8" by 4" NaI detector. Click on the figure to see the resulting spectrum.

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The Conrad intercomparison

VMC in-vivo was used in the CONRAD intercomparison, and the results were very similar to the experimental results. The figure shows the spectrum obtained by counting Am-241 in the University of Cincinatti knee. Click on the figure to enlarge.

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