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Phys Med Biol. 2013 Jun 21;58(12):4225-36. doi: 10.1088/0031-9155/58/12/4225. Epub 2013 May 29.

Liquid ionization chamber initial recombination dependence on LET for electrons and photons.

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  • 1FOI, Swedish Defence Research Agency, CBRN Defence and Security, SE-901 82 Umeå, Sweden.


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™ 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 µm(-1) and a corresponding dose averaged LET between 0.97 and 4.62 keV µm(-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.

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