Pdf Determining Ion Collection Efficiency In A Liquid
However, the measured signal can be also influenced by ion recombination and polarity effects so that further corrections are required. to consider the loss of charge carriers through recombina tion processes, the so called saturation correction factor k s is defined as the inverse of the charge collection efficiency. The ion collection efficiency of the advanced markus chamber is in good agreement to the numerical solution based on the work of gotz et al. 15 the approximation to extend the range of field strength and therefore the range of dpp shows reliable results. increasing the electrical field in the ionization chamber due to higher voltage and a. An ion collection efficiency correction should therefore be applied for both reference and relative dosimetry. lowering of the dose rate increased the ion collection efficiency because the time between pulses became long enough for the pulses to be fully collected. Collection efficiency f = q q, and make a correction to obtain the charge q produced in an ion chamber • this can be done simply in practice in most cases, assuming that the ion chamber volume does not contain low field “pockets” of persistent recombination as a result of poor geometry – internal corners should be rounded, not sharp. The incomplete charge collection efficiency, due to the ion recombination, should be corrected by applying the recombination correction factor to the chamber response. in fact, this correction factor is the inverse of ion chamber charge collection efficiency (laitano et al., 2006).
Ion Collection Efficiency Of Ionization Chambers In Ultra
Incomplete charge collection efficiency of employed ion chamber for high energy photon dosimetry is one of the main concerns which should be compensated. in this regard, a correction factor, known as recombination correction factor (k s), has been introduced by different methods. Corrections for ion chamber collection inefficiency • the recombination correction factor p ion is used to correct ion chamber readings for lack of complete collection efficiency • p ion is a function of the dose per pulse in an accelerator and thus will change if either the pulse rate for a fixed dose rate, or the dose rate is changed. Using the liquid ionization chamber, the ion collection efficiency for flattened beams was above 0.990 for all dose rates. however, this chamber showed a low collection efficiency of 0.940 for the fff 10 mv beam at a dose rate of 31.9 gy min −1. all investigated air vented ionization chambers can be reliably used for relative dosimetry of fff.
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