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Related Experiment Videos

Proton dosimetry in bone using electron spin resonance

J F Copeland1, K P Gall, S Y Lee

  • 1Department of Physics, University of Massachusetts, Lowell 01854, USA.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|November 1, 1996
PubMed
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Proton irradiation of bone shows a linear Electron Spin Resonance (ESR) response similar to photon irradiation. Bone

Area of Science:

  • Medical Physics
  • Biophysics
  • Radiation Dosimetry

Background:

  • Electron Spin Resonance (ESR) is a technique used to detect unpaired electrons.
  • Bone's response to radiation is crucial for dosimetry and understanding radiation damage.
  • Proton therapy is an increasingly common form of radiation treatment.

Purpose of the Study:

  • To investigate the ESR response of ex vivo bone to proton irradiation.
  • To compare the proton dose response with photon dose response in bone.
  • To analyze the depth-response characteristics of ESR signals in proton-irradiated bone.

Main Methods:

  • Bone samples were irradiated with 105 MeV protons and 6 MV photons.
  • ESR spectroscopy was used to measure the radiation-induced signal.

Related Experiment Videos

  • Depth-response curves were generated and compared with parallel plate ionization chamber (PPIC) measurements.

    • Main Results:

    • The ESR response to proton dose was linear from 0 to 50 Gy, mirroring the photon dose response.
    • The ESR depth-response curve showed a depression compared to PPIC measurements.
    • A short-term signal fade was observed in the Bragg peak region, attributed to the organic component of bone.

    Conclusions:

    • ESR is a viable method for assessing proton dose in bone.
    • Discrepancies in depth response and signal fade warrant further investigation for accurate in vivo dosimetry.
    • Understanding these effects is critical for optimizing proton therapy for bone tumors.