PMID: 8587935Nov 1, 1995Paper

Faraday cup dosimetry in a proton therapy beam without collimation

Physics in Medicine and Biology
Erik GrusellJ Medin

Abstract

A Faraday cup in a proton beam can give an accurate measurement of the number of protons collected by the cup. It is shown that the collection efficiency with a proper design can be close to unity. To be able to calibrate an ionization chamber from such a measurement, as is recommended in some dosimetry protocols, the energy spectrum of the proton beam must be accurately known. This is normally not the case when the lateral beam extension is defined by collimators. Therefore a method for relating an ionization chamber measurement in an uncollimated beam to the total number of protons in the beam has been developed and is described together with experimental results from calibrating an ionization chamber using this method in the therapeutic beam in Uppsala. This method is applicable to ionization chambers of any shape and the accuracy is estimated to be 1.6% (1 SD).

Citations

Nov 1, 1996·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·S VatnitskyG Hartmann
Feb 1, 1997·International Journal of Radiation Oncology, Biology, Physics·S DelacroixJ L Habrand
Nov 4, 2016·Medical Physics·Hugo Palmans, Stanislav M Vatnitsky
Nov 14, 2018·Medical Physics·Simona Giordanengo, Hugo Palmans
May 3, 2007·Physics in Medicine and Biology·Nina TillyBengt Glimelius
May 17, 2007·Physics in Medicine and Biology·Peter KimstrandNina Tilly
Feb 12, 2008·Physics in Medicine and Biology·Peter KimstrandErik Traneus
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Oct 19, 2010·Physics in Medicine and Biology·Christian P KargerTatsuaki Kanai
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Aug 20, 2016·Reports on Progress in Physics·Marco Durante, Harald Paganetti
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