3.2 Perform dose measurements in radiotherapy beams using a range of dosimeters

Recommended Items of Training:

a. Gain an understanding of the advantages and disadvantages of using particular detectors for absolute and relative dosimetry measurements. Write a report on your understanding.

b. Perform measurements with TLDs and demonstrate an understanding of aspects such as:

  • Commonly available TLDs (shapes, sizes and materials).
  • Common examples of TLD measurements: eye, TBI, electron treatments, under shielding, etc.
  • TLD measurements: preparation, precautions etc.
  • Basic structure and function of the photomultiplier tube.
  • QA in TLD measurements

c. Perform measurements with solid state dosimeters and demonstrate an understanding of aspects such as:

  • Design of diodes, photon/electron diodes, shielding, preirradiation, energy dependence.
  • Typical bias voltages and output currents.

d. Perform measurements with films including radiographic and radiochromic films, and demonstrate an understanding of aspects such as:

  • Basic structure and function of film types.
  • Basic structure and function of a film processor.
  • Basic structure and function of a film densitometer/scanner.
  • Perform a calibration of film in terms of absorbed dose
  • QA for film dosimetry

Training, Evidence and Notes

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