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Measuring small field profiles and output factors with a stemless plastic scintillator array.

Michael A Hupman1, Ian G Hill1, Alasdair Syme1,2,3

  • 1Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada.

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A novel stemless plastic scintillation detector (SPSD) array using organic photodiodes accurately measured small field profiles and output factors, outperforming bulk scintillators in precision for radiation therapy applications.

Keywords:
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Area of Science:

  • Medical Physics
  • Radiation Detection
  • Semiconductor Devices

Background:

  • Accurate measurement of small radiation fields is crucial for modern radiotherapy techniques.
  • Traditional detectors often face challenges in precisely characterizing these small fields.
  • Organic photodiodes offer a potential solution for compact and sensitive radiation detection.

Purpose of the Study:

  • To fabricate a one-dimensional (1D) stemless plastic scintillation detector (SPSD) array.
  • To utilize organic photodiodes within the SPSD array for radiation detection.
  • To measure small field profiles and output factors accurately using the fabricated SPSD array.

Main Methods:

  • Fabrication of an organic photodiode array using P3HT:PCBM semiconductors on an ITO-coated glass substrate.
  • Integration of various scintillator designs (bulk and laser-etched segmented) atop the photodiode array.
  • Calibration of the detector array and subsequent measurement of small field profiles (0.5x0.5 to 2x2 cm²) and output factors (0.5x0.5 to 25x25 cm²) using a 6 MV photon beam, with comparisons to film and ion chamber measurements.

Main Results:

  • The laser-etched segmented scintillator array demonstrated good agreement with film for small field profiles.
  • Output factors measured by the segmented scintillator agreed within 1.2% of ion chamber measurements for field sizes down to 1x1 cm².
  • Bulk scintillators showed significant deviations in profile measurements and output factors compared to reference detectors, especially for fields smaller than 5x5 cm².

Conclusions:

  • A 1D stemless plastic scintillation detector (SPSD) array was successfully fabricated and demonstrated.
  • The etched scintillator design within the SPSD array provided excellent accuracy for small field profile measurements.
  • The SPSD array, particularly with the etched scintillator, is a viable tool for precise output factor measurements in small radiation fields.