Calibration of Photon and Electron Beams

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Link to IAEA Radiation Oncology Physics: A Handbook for Teachers and Students
Slides: Chapter 9. CALIBRATION OF PHOTON AND ELECTRON BEAMS
Text: Chapter 9. CALIBRATION OF PHOTON AND ELECTRON BEAMS

Contents

[edit] Introduction

  1. Calorimetry
  2. Fricke (chemical) dosimetry
  3. Ionization chamber dosimetry
  4. Mean energy expended in air per ion pair formed
  5. Reference dosimetry with ionization chambers
  6. Clinical beam calibration and measurement chain
  7. Dosimetry protocols or codes of practice

[edit] Ionization chamber based dosimetry

  1. Ionization chambers
  2. Electrometer and power supply
  3. Phantoms

[edit] Chamber Signal Corrections for influence quantities

  1. Air temperature, pressure, and humidity effects: kT,P
  2. Chamber polarity effects: polarity correction factor kpol
  3. Chamber voltage effects: recombination correction factor ksat
  4. Chamber leakage currents
  5. Chamber stem effects

[edit] Determination of absorbed dose using calibrated chambers

  1. Air kerma based protocols
  2. Absorbed dose to water based protocols

[edit] Stopping power ratios

  1. Stopping power ratios for electron beams
  2. Stopping power ratios for photon beams

[edit] Mass-energy absorption coefficient ratios

[edit] Perturbation correction factors

  1. Displacement perturbation factor pdis
  2. Chamber wall perturbation factor pwall
  3. Central electrode perturbation factor pcel
  4. Cavity or fluence perturbation factor pcav

[edit] Beam quality specification

  1. Beam quality specification for kilovoltage photon beams
  2. Beam quality specification for megavoltage photon beams
  3. Beam quality specification for megavoltage electron beams

[edit] Calibration of MV photon and electron beams

  1. MV photon beams: Air kerma in air calibration coefficient NK,Co
  2. MV photon beams: Dose to water calibration coefficient ND,w,Co
  3. MV electron beams: Air kerma in air calibration coef. NK,Co
  4. MV electron beams: Dose to water calibration coef. ND,w,Co
  5. Summary

[edit] Kilovoltage dosimetry

  1. Specific features of kilovoltage beams
  2. Air kerma in air based in-phantom calibration method
  3. Air kerma in air based backscatter method
  4. Air kerma in air based calibration for very low energies
  5. Absorbed dose to water based calibration method

[edit] Error and uncertainty analysis for ionization chambers

  1. Errors and uncertainties
  2. Classification of uncertainties
  3. Uncertainties in the calibration chain

[edit] BIBLIOGRAPHY

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