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Verification of absorbed doses determined with thimble and plane-parallel ionization chambers in clinical electron beams using ferrous sulphate dosimetry. Final report for the period 1 July 1991 - 1 July 1992

Technical Report:

Abstract

Different ionometric methods to determine absorbed dose in phantoms irradiated with electron beams were tested using ferrous sulphate dosimetry as a reference method. Irradiation was carried out with three different types of accelerators in the energy range 4 to 20 MeV. Three different types of plane parallel ionization chambers were used and two types of cylindrical chambers. It was found that the ionization chamber dosimetry following the International Code of Practice (TRS 277) gave dose values as a mean 0.6% higher than the ferrous sulphate dosimetry based on the ICRU report 35. There were no significant differences between results measured at different electron energies. The mean deviation obtained using the two dosimeter systems is inside the experimental uncertainty. This proves that the TRS 277 can be used for accurate dosimetry. Further, the results show that corrections are needed for some types of plane parallel plate chambers to correct for the perturbation by the chamber of the electron fluence in the water phantom, and that values of these corrections are given as a function of the electron energy. 14 refs, 4 figs, 2 tabs.
Authors:
Thierens, H [1] 
  1. Ghent Univ., Ghent (Belgium). Standard Dosimetry Lab.
Publication Date:
Sep 01, 1992
Product Type:
Technical Report
Report Number:
IAEA-R-6687-F
Reference Number:
SCA: 440102; PA: AIX-24:002600; SN: 93000913324
Resource Relation:
Other Information: PBD: Sep 1992
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CHEMICAL DOSEMETERS; COMPARATIVE EVALUATIONS; IONIZATION CHAMBERS; ACCURACY; ELECTRON BEAMS; ELECTRON DOSIMETRY; EXPERIMENTAL DATA; PHANTOMS; RADIATION DOSES; 440102; RADIATION DOSEMETERS
OSTI ID:
10108852
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE93609494; TRN: XA9232926002600
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[26] p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Thierens, H. Verification of absorbed doses determined with thimble and plane-parallel ionization chambers in clinical electron beams using ferrous sulphate dosimetry. Final report for the period 1 July 1991 - 1 July 1992. IAEA: N. p., 1992. Web.
Thierens, H. Verification of absorbed doses determined with thimble and plane-parallel ionization chambers in clinical electron beams using ferrous sulphate dosimetry. Final report for the period 1 July 1991 - 1 July 1992. IAEA.
Thierens, H. 1992. "Verification of absorbed doses determined with thimble and plane-parallel ionization chambers in clinical electron beams using ferrous sulphate dosimetry. Final report for the period 1 July 1991 - 1 July 1992." IAEA.
@misc{etde_10108852,
title = {Verification of absorbed doses determined with thimble and plane-parallel ionization chambers in clinical electron beams using ferrous sulphate dosimetry. Final report for the period 1 July 1991 - 1 July 1992}
author = {Thierens, H}
abstractNote = {Different ionometric methods to determine absorbed dose in phantoms irradiated with electron beams were tested using ferrous sulphate dosimetry as a reference method. Irradiation was carried out with three different types of accelerators in the energy range 4 to 20 MeV. Three different types of plane parallel ionization chambers were used and two types of cylindrical chambers. It was found that the ionization chamber dosimetry following the International Code of Practice (TRS 277) gave dose values as a mean 0.6% higher than the ferrous sulphate dosimetry based on the ICRU report 35. There were no significant differences between results measured at different electron energies. The mean deviation obtained using the two dosimeter systems is inside the experimental uncertainty. This proves that the TRS 277 can be used for accurate dosimetry. Further, the results show that corrections are needed for some types of plane parallel plate chambers to correct for the perturbation by the chamber of the electron fluence in the water phantom, and that values of these corrections are given as a function of the electron energy. 14 refs, 4 figs, 2 tabs.}
place = {IAEA}
year = {1992}
month = {Sep}
}