title: Liquid ionization chamber initial recombination dependence on LET for electrons and photons.
abstract: 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.
authors.affiliation: FOI, Swedish Defence Research Agency, CBRN Defence and Security, SE-901 82 Umeå, Sweden. erik.johansson@foi.se
authors.forename: Erik
authors.initials: E
authors.lastname: Johansson
authors.forename: Jonas
authors.initials: J
authors.lastname: Andersson
authors.forename: Lennart
authors.initials: L
authors.lastname: Johansson
authors.forename: Heikki
authors.initials: H
authors.lastname: Tölli
mesh_terms: D004583:Electrons; D018499:Linear Energy Transfer; D009010:Monte Carlo Method; D017785:Photons; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation*; D035501:Uncertainty