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A rotating-slit-collimator-based gamma radiation mapper.

Jonas M C Nilsson1, Robert R Finck1, Christopher L Rääf1

  • 1Medical Radiation Physics, Department of Translational Medicine, Lund University, Skåne, University Hospital, S-205 02 Malmö, Sweden.

Journal of Environmental Radioactivity
|July 17, 2017
PubMed
Summary
This summary is machine-generated.

Remote gamma sensing can map radioactive sources in inaccessible areas. A mobile system using a germanium detector and image reconstruction accurately located 137Cs sources from a distance.

Keywords:
CollimatorDeconvolutionGamma radiationHPGeImage reconstructionMapping

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Area of Science:

  • Nuclear physics
  • Radiation detection and measurement
  • Environmental monitoring

Background:

  • Assessing radiation environments in inaccessible areas is challenging.
  • Remote measurements are crucial when direct access is impossible or hazardous.
  • Collimated detectors are essential for directional radiation identification.

Purpose of the Study:

  • To develop and test a system for mapping gamma-emitting radioactive materials from a distance.
  • To investigate the feasibility of localizing radiation sources in non-enterable environments.
  • To evaluate the effectiveness of mobile gamma radiometry with image reconstruction.

Main Methods:

  • A mobile system with a computer-controlled rotating slit collimator and a high-purity germanium detector was constructed.
  • Measurements were taken from multiple locations outside a 25x25 m² area.
  • A specialized image reconstruction algorithm was applied to deconvoluted data.

Main Results:

  • The system successfully mapped three 330 MBq 137Cs point sources.
  • Source locations were determined with a 1-3 meter uncertainty.
  • Mapping was achieved using data from four locations with 20 minutes of measurement time per location.

Conclusions:

  • Mobile gamma radiometry with collimated detectors shows significant potential for remote source localization.
  • Image reconstruction algorithms are effective for mapping radioactive materials in inaccessible areas.
  • The developed system demonstrates a viable approach for radiation assessment in hazardous environments.