Dr Matjaž Aleš Korun

Scientific Adviser, retiredE-mail: Tel: +38619876543

Dr. Korun was engaged with gamma-ray spectrometry of samples from natural and living environment and samples from technological processes. He developed a method for the efficiency calibration of gamma-ray spectrometers for homogeneous cylindrical samples in the energy range from 5 keV to 3 MeV. He introduced new methods for calculation of the activities of gamma-ray emitters in the presence of coincidence summing effects, for interpretation of measurement results in the vicinity of the detection limits and for calculation of detection limits. He improved methods for the characterisation of backgrounds of gamma-ray spectrometers and methods for their reduction. In the field if metrology of radionuclides he included uncertainties arising from sampling, sample properties and spectrum analysis into the uncertainty of measurement results. He worked out a procedure for calculation of uncertainty of activities in the presence of correlations between input quantities. He developed a method for traceability of acquisition times. He used gamma-ray spectrometers as neutron detectors, developed a method for quantitative analysis of gamma-ray spectra measured in-situ and a method for measurement of activities in waste drums.


  • B. D. in Physics (Univerza v Ljubljani,  Fakulteta za naravoslovje in tehnologijo)
  • M. Sc. in Nuclear Physics  (Univerza v Ljubljani, Fakulteta za naravoslovje in tehnologijo)
  • Ph. D.  in Nuclear Physics (Univerza Edvarda Kardelja v Ljubljani, Fakulteta za naravoslovje in tehnologijo, 1982


  • Young Researcher, IJS, 1972– 1982
  • Professional Associate, IJS, 1982 – 1992
  • Postdoc Associate, IJS, 1992 – 1995
  • Researcher, IJS, 1995 – 1999
  • Senior Researcher, IJS, 1999 – 2004
  • Scientific Adviser, IJS 2004 – 2009
  • Retired, 2009

Field of work

  • Photonuclear reactions
  • Monitoring of radioactivity in the environment
  • Gamma-ray spectrometry
  • Gamma-ray spectrometry in-situ
  • Quality assurance
  • Emergency preparedness
  • Metrology of radionuclides

Other projects


  • (2000 – 2002) Post-emergency monitoring of radioactivity


  • (1982 – 2009) Monitoring NEK
  • (2002 – 2007) Monitoring of radioactivity in the Republic of Slovenia
  • (1982 – 2002) Mobile Unit