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Liquid ionization chamber initial recombination dependence on LET for electrons and photons
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics.
2013 (English)In: Physics in Medicine and Biology, ISSN 0031-9155, E-ISSN 1361-6560, Vol. 58, no 12, 4225-4236 p.Article in journal (Refereed) Published
Abstract [en]

The possibility of indirect measurements of linear energy transfer (LET) with a liquid ionization chamber (LIC) has been investigated by studying initial recombination losses at different applied voltages. A linear fit is made to the voltage-signal curve and the intersection point of the fit and the voltage-axis is shown to correlate with LET. The LIC applied voltages were 100-700 V, which corresponds to electric field strengths between 0.3 and 2.0 MV m(-1). Several different photon and electron beams have been studied, and by using MCNPX (TM) the respective LET spectra have been determined. The beam qualities in this study were found to have a fluence averaged LET between 0.17 and 1.67 keV mu m(-1) and a corresponding dose averaged LET between 0.97 and 4.62 keV mu m(-1). For the experimental data in this study the linear fit method yields consistent results with respect to Monte Carlo simulated LET values. A calibration curve for LET determination is provided for the LIC used in the present work.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2013. Vol. 58, no 12, 4225-4236 p.
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:umu:diva-78436DOI: 10.1088/0031-9155/58/12/4225ISI: 000319966100018OAI: oai:DiVA.org:umu-78436DiVA: diva2:637829
Available from: 2013-07-23 Created: 2013-07-22 Last updated: 2017-12-06Bibliographically approved

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Johansson, ErikAndersson, JonasJohansson, LennartTölli, Heikki

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