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Decommissioning of a Medical Cyclotron using ISOCS


  • RDS-112 Positron Emission Tomography (PET) cyclotron manufactured by CTI Molecular Imaging, Inc., in Knoxville, Tennessee, USA, producing F-18 and C-11 PET radiochemicals.
  • Operated for eight years and decommissioned in 2007.
  • Components ranging from 0.1 g targets to 10,000 kg concrete shields.
  • Activities ranged over nine orders of magnitude.

Key Drivers:

  • Thorough radiological characterization required for shipping and disposal.
  • Locate and characterize all activation hotspots.
  • Wide range of activation products present in activated metals and concrete, including Fe-55, Mn-54, Zn-65, Sb-124, W-181, Ta-182, Co-57, Co-60 and Cs-137.
  • Very limited timeframe available for measurements (2 days) and analyses (1 month).
  • Limited characterization budget prohibited sampling and offsite analysis.

Instruments & Techniques Used:

  • InSpector™ 1000 Gamma Probe
  • Genie™ 2000 Gamma Analysis
  • BEGe High Resolution Detector
  • ISOCS Efficiency Calibration Software

CANBERRA™ Solution:

  • Locate activation hotspots using handheld NaI probe, perform 100% gamma scan on all items.
  • Measure each hotspot with ISOCS-characterized high resolution Broad Energy Germanium (BEGe) detector and ISOCS mathematical efficiency calibration software.
  • Develop customized nuclide libraries for each type of activated material.
  • Analyze gamma spectra and generate Radioassay Data Sheet for each item.
  • Produce comprehensive Radiological Characterization Report to include all items.
  • Perform all measurements in low-background area to minimize intereferences.


  • All analytical results were delivered to the customer within thirty days.
  • 100% of the cyclotron components were scanned for activation hotspots.
  • 45 high-resolution gamma spectroscopy measurements were performed over two days in the field.
  • Activated items ranging from simple to very complex were modeled.
  • Activities over nine orders of magnitude were measured and reported.

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