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Determination of Crystal Structures01:29

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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SU-E-T-153: Detector-Grade CVD Diamond for Radiotherapy Dosimetry.

S Lansley1,2,3, G Betzel1,2,3, D McKay1,2,3

  • 1University of Canterbury, Christchurch, NZ.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

Synthetic diamond films show promise as x-ray detectors for radiotherapy dosimetry. These chemical vapor deposition (CVD) diamond detectors offer high sensitivity and a small sensitive volume, making them suitable for precise dose measurements in small fields.

Keywords:
Chemical sensorsChemical vapor depositionDiamondDosimetryElemental semiconductorsLeak detectorsLeakage currentsPhotonsRadiation therapyThin films

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Area of Science:

  • Medical Physics
  • Materials Science
  • Radiotherapy Physics

Background:

  • Accurate dosimetry is critical in radiotherapy for effective cancer treatment.
  • Current detectors may have limitations in sensitivity or spatial resolution for small radiation fields.
  • Synthetic diamond films offer unique properties for radiation detection applications.

Purpose of the Study:

  • To evaluate commercially available synthetic diamond films produced via chemical vapor deposition (CVD) as x-ray detectors.
  • To assess their suitability for radiotherapy dosimetry, particularly in small radiation fields.

Main Methods:

  • A CVD diamond detector with a 0.4 mm³ sensitive volume was fabricated and encapsulated.
  • Measurements were performed in a water phantom using a clinical linear accelerator (linac) with 6- and 10-MV photons.
  • Key detector characteristics evaluated included leakage current, response dynamics, dose linearity, dose rate dependence, percent depth dose, and output factors, with comparisons to ion chambers and silicon diodes.

Main Results:

  • Negligible leakage currents (∼1 pA) and high sensitivity (680 nC/Gy) were observed.
  • Detector response showed fast rise/fall times (< 2 s) and linearity up to 5 Gy.
  • Percent depth dose profiles closely matched ion chamber measurements, and output factors were accurate for field sizes 5-15 cm.

Conclusions:

  • CVD synthetic diamond films demonstrate significant potential for small field dosimetry in radiotherapy.
  • Their small sensitive volume and high sensitivity are advantageous for precise dose measurements.
  • Further research is needed to optimize detector packaging and explore broader clinical applications.