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A diamond guard ring microdosimeter for ion beam therapy.

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A novel diamond microdosimeter with a guard ring electrode was developed. This device accurately measures proton energy deposition, showing potential for clinical radiation therapy applications.

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Area of Science:

  • Materials Science
  • Nuclear Instrumentation
  • Medical Physics

Background:

  • Microdosimetry is crucial for understanding radiation effects in biological tissues.
  • Existing microdosimeters face challenges in spatial resolution and accuracy under clinical beam conditions.
  • Diamond sensors offer advantages due to their robust properties and fast charge carrier response.

Purpose of the Study:

  • To design and fabricate a single crystal chemical vapor deposition diamond-based microdosimeter prototype.
  • To investigate the charge transport properties and spatial resolution of the microdosimeter.
  • To evaluate its potential for microdosimetry in clinical settings.

Main Methods:

  • Fabrication of a microdosimeter prototype with micro-sensitive volumes (μSVs) and a guard ring (GR) electrode using microfabrication techniques.
  • Irradiation of the GR microdosimeter using a raster scanning method with 2 MeV proton microbeams.
  • Measurement of charge collection efficiency (CCE), μSV geometry, and pulse-height spectra to determine charge transport properties with sub-micron resolution.

Main Results:

  • The fabricated microdosimeter demonstrated a well-defined and homogeneously active μSV.
  • Full charge collection efficiency (CCE) was achieved for protons with lineal energies of approximately 46 keV/μm through appropriate biasing.
  • The device achieved sub-micron spatial resolution in characterizing charge transport properties.

Conclusions:

  • The guard ring diamond microdosimeter prototype shows excellent performance and potential for accurate microdosimetry.
  • The device's ability to achieve full CCE at relevant lineal energies makes it suitable for clinical beam conditions.
  • This technology advances the field of radiation dosimetry for targeted therapies.