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Activity name

AUTOMORC: Improvement of automatic methods for identification of radioactive material out of regulatory control (MORC) by mobile gamma spectrometric search


NKS-B Research Area Emergency Preparedness
Project summary

The experience showed that when using NaI(Tl)-spectrometry systems the detection sensitivity in terms of the longest detection distance depended on the type of advanced processing of the data. Simpler methods using only an alarm for increased count rate in a single energy window gave shorter detection distances and often difficulties to identify the radionuclide in cases where more than one radionuclide could be considered. More advanced processing methods made retrospectively, could generally identify the radionuclide at somewhat larger distances. Manual after-analysis requires specialist knowledge and is time consuming. More advanced numerical methods for automatic instant analysis of measurement data would probably improve the prompt identification of radionuclides and extend the detection distances. Such methods could be based on variance analysis using the method described by Kock et al (2010), statistical processing according to Hjerpe et al (2001), peak hypotheseis testing (S. Kuukankorpi et al, 2007), or noise reduction methods (Hovgaard and Grasty, 1997). Simultaneous analysis of varying time intervals would also improve detection capability (Nilsson, 2016).


The project is directed towards mobile NaI(Tl)-spectrometry with the aims to (1) select and program at least one improved automatic method for instant source detection on a standalone computer, (2) test the method on measurement data collected from the project MOMORC 2016, (3) provide Nordic participants with the description and access to the method for use with their own detectors and measuring systems, and (4) carry out a joint field experiment with mobile measuring equipment where the method is tested against combinations of radiation fields using medical radionuclides and shielded or partially shielded strong sources where the scattered radiation is an essential component. The project is scheduled for a two-year period with points 1-3 carried out in 2017 and the field experiment (point 4) to be realized in spring 2018 with evaluation of the experiment during the summer and autumn and a follow-up meeting in October 2018.
Lead Organization Medical Physics, Dept. of Translational Medicine, Lund University, Sweden
Contact Person Christopher Rääf 
phone number: +46 40 331145


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