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Depth Profiling of Contamination Distribution: Non Invasive Solutions

Key Drivers

  • Map the in depth contamination distribution in walls and floors when a non-invasive method is required.
  • Ensure worker safety in efficiently applying ALARA principles and mitigating risks.
  • Optimize financial cost with an upstream assessment of waste volumes and subsequent disposal costs prior to any dismantling field work.
  • Collect all relevant data, before and during field work, allowing optimization of:
    • The choice of the most efficient dismantling tools, techniques, methods
    • Field work duration
    • Waste sentencing

Key Benefits

  • Field Work Time Reduction
  • Dose Exposure Reduction
  • Cost Reduction of total project


  • Accurate characterization of in-depth contamination distribution in homogeneous and non-homogeneous mediums (walls, slabs, concrete…)
  • 3D mapping of contamination allowing waste volume calculation per category
  • Gamma activity measurement
  • Provide customers with versatile solutions to perform:
    • Accurate upstream mapping of contamination
    • Fast in-situ measurements during D&D operations
    • Rigorous final verification measurements

Concrete wall measurements with CZT or HPGe detectors

Technical description

Surface measurement of concrete can be carried out by a simple ISOCS™ instrument measurement. For depth profiling measurement, three non-invasive methods are available:

  1. Outside Wall using the ISOCS system, take one measurement if using multi-energy line nuclides
    • Non-invasive.
    • HPGe ISOCS based.
    • Needs multi-energy nuclide e.g. 152Eu, 238U, 235U, Ra+d, Th+d, even 137Cs (surface) or 60Co (in depth) as reference, most of them were well calibrated, to determine the contaminated isotope and activity on depth profile.
    • ISOCS system efficiency calibrations.
    • Advanced In-situ Gamma Spectrometry (AIGS) Services.
  2. Outside Wall using the ISOCS system, take three measurements if using single energy line nuclides
    • Multiple measurements at different angles.
    • ISOCS based collimated detector.
    • Can use simpler nuclides or with single energy line nuclides to determine the depth profile of contaminated sources.
    • Best result is when all spectra have the same activity at all energies.
    • Advanced In-situ Gamma Spectrometry (AIGS) Services.
  3. Outside Wall using the ISOCS system in-situ and spectrum shape data
    • Based on increased Compton down-scatter for activity at deeper locations.
    • Calibration based on Peak-to-Compton ratio as a function of depth.
    • Sophisticated algorithms implemented in software.

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