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Electron backscatter corrections for parallel-plate chambers.

M A Hunt1, G J Kutcher, A Buffa

  • 1Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021.

Medical Physics
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Parallel-plate ionization chambers may underrespond in electron beams due to backscatter effects from their supports. This underresponse is energy-dependent, decreasing as electron beam energy increases.

Area of Science:

  • Medical Physics
  • Radiation Dosimetry

Background:

  • Ionization chamber walls are typically assumed to have negligible effects on response in electron beams.
  • However, parallel-plate chambers have large supports that can influence response, particularly due to energy-dependent electron backscatter.

Purpose of the Study:

  • To investigate the impact of mechanical supports on parallel-plate ionization chamber response in electron beams.
  • To quantify electron backscatter effects from low atomic number materials used in chamber construction.

Main Methods:

  • Measured electron backscatter from Lucite and polystyrene with electron beams from 6 to 20 MeV.
  • Studied the influence of backscatter material diameter and thickness.
  • Compared the response of two commercial parallel-plate chambers with a cylindrical chamber.

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Main Results:

  • Parallel-plate chambers are expected to underrespond by 1-2% at 6 MeV, decreasing to insignificant levels above 16 MeV.
  • Measurements showed parallel-plate chambers underresponded by approximately 1% at 6 MeV and 0.5% at 9 MeV.
  • Results were qualitatively consistent with electron backscatter data.

Conclusions:

  • Mechanical supports of parallel-plate ionization chambers can cause underresponse in electron beams due to backscatter.
  • Chamber design modifications can minimize these electron backscatter effects.
  • Current dosimetry protocols may not fully account for this phenomenon.