Jove
Visualize
Contact Us

Related Experiment Videos

Ionization chamber shift correction and surface dose measurements in electron beams

I J Das1, S W McNeeley, C W Cheng

  • 1Department of Radiation Oncology, Fox Chase Cancer Center, Philadelphia, PA 19111, USA. I_das@fccc.edu

Physics in Medicine and Biology
|December 1, 1998
PubMed
Summary

Determining the effective point of measurement for cylindrical ionization chambers in electron beams is crucial for accurate surface dose. This study presents a reliable method to estimate chamber shift and surface dose, improving electron beam dosimetry.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Involuntary autobiographical memories: a pilot study.

East Asian archives of psychiatry : official journal of the Hong Kong College of Psychiatrists = Dong Ya jing shen ke xue zhi : Xianggang jing shen ke yi xue yuan qi kan·2026
Same author

Validation of the Chinese Version of Obsessive-Compulsive Inventory-Revised.

East Asian archives of psychiatry : official journal of the Hong Kong College of Psychiatrists = Dong Ya jing shen ke xue zhi : Xianggang jing shen ke yi xue yuan qi kan·2019
Same author

Corrigendum to "Comparative analysis of novel autoantibody isotypes against citrullinatedinter-alpha-trypsin inhibitor heavy chain 3 (ITIH3) 542-556 peptide in serum from Taiwanese females with rheumatoid arthritis, primary Sjögren's syndrome and secondary Sjögren's syndrome in rheumatoid arthritis" [J Proteomics 141: (2016) 1-11].

Journal of proteomics·2018
Same author

Aetiological bases of 46,XY disorders of sex development in the Hong Kong Chinese population.

Hong Kong medical journal = Xianggang yi xue za zhi·2015
Same author

The effect of slice thickness on target and organs at risk volumes, dosimetric coverage and radiobiological impact in IMRT planning.

Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico·2015
Same author

Chinese herbal medicine for functional constipation: a randomised controlled trial.

Hong Kong medical journal = Xianggang yi xue za zhi·2014
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Dosimetry

Background:

  • Cylindrical ionization chambers introduce perturbations affecting accurate measurement points in electron beam dosimetry.
  • Gradient perturbations necessitate shift corrections, but variations in these corrections lead to surface dose uncertainty.

Purpose of the Study:

  • To accurately estimate the effective point of measurement for cylindrical ionization chambers in electron beams.
  • To develop a reliable method for determining surface dose and necessary shift corrections in electron beam dosimetry.

Main Methods:

  • Ionization measurements were performed with chambers in air and phantom at varying source-to-chamber distances.
  • Data were fitted using inverse square and electron depth dose functions to determine chamber shift and surface dose.

Related Experiment Videos

Main Results:

  • The study found that ionization chamber shift correction is energy-dependent, varying from 0.9r to 0.5r between 6 MeV and 20 MeV.
  • Surface dose measurements and mathematical determinations showed agreement within 3%.

Conclusions:

  • The presented method provides an unambiguous, fast, and reliable estimation of surface dose and shift corrections for cylindrical ionization chambers in electron beams.
  • Accurate determination of the effective point of measurement enhances precision in electron beam dosimetry.