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The Use of Plane Parallel Ionization Chambers in High Energy Electron and Photon Beams

An International Code of Practice for Dosimetry

English STI/DOC/010/381 92-0-104896-3
125 21 32.00 1997

Description

This report both complements and extends Technical Reports Series No. 277/2, Absorbed Dose Determination in Photon and Electron Beams - An International Code of Practice, IAEA Technical Reports Series No. 277/2. It describes options and how to calibrate plane parallel ionization chambers, against air kerma or absorbed dose to water standards at cobalt-60 gamma ray energies. The use of these chambers to calibrate therapy electron beams, as well as relative dose measurements for photon and electron beams, is presented. This publication also updates some of the data and concepts used in Technical Reports Series No. 277/2. It fills gaps in the latter report with respect to plane parallel chambers with a view to improve accuracy in radiotherapy when these chambers are used.
Contents: 1. Introduction; 2. Update of the information in TRS-277; 3. Equipment; 4. Beam quality specification; 5. NK based formalism and determination of ND,air for plane parallel ionization chambers; 6. ND,w based formalism and determination of ND,w factors for plane parallel ionization chambers; 7. Use of plane parallel chambers in electron beams; 8. Use of plane parallel chambers in photon beams; 9. The uncertainty in absorbed dose determination at the reference depth using plane parallel chambers in electron beams; 10. A code of practice for the calibration and use of plane parallel ionization chambers; Appendix A: Examples; Appendix B: Stopping power ratios in clinical electron beams; Appendix C: Chamber perturbation factors in electron and photon beams.

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