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SCANNING METHOD AND APPARATUS

  • US 20150241572A1
  • Filed: 11/02/2012
  • Published: 08/27/2015
  • Est. Priority Date: 11/02/2011
  • Status: Active Grant
First Claim
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1. A method of scanning a structure to detect changes in density between different parts of the structure comprising the steps of:

  • a) providing at least one source of gamma radiation, and a plurality of detector units capable of detecting said gamma radiation, each said detector unit comprising;

    i.a radiation detector comprising a scintillator comprising a scintillating material and having a detecting surface defined by its thickness t and height h, wherein t≦

    h at the detecting surface and having a depth d perpendicular to the detecting surface at least 2t, andii.a photodetector for detecting light emitted by the scintillator in response to gamma radiation, andiii.a collimator placed between the scintillator and the source of radiation;

    b) causing said source unit to emit gamma radiation along a predetermined radiation path towards said detector, wherein said path passes through at least a portion of said structure;

    c) measuring the number of photons of gamma radiation detected by each one of said detectors;

    d) calculating a density value for each path from the measurement of photons detected by the detector associated with the respective path.

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