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The interaction of radiation with DNA molecules has been intensively studied in the last years, allowing improvements on the experimental techniques and on the theoretical comprehension of the phenomena involved in that interaction under controlled conditions. In this work, a new experimental technique has been developed which enables one to study the radiation-DNA interaction for different radiations and with reduced uncertainties, allowing a quantitative analysis of singleand double-strand breaks on DNA in aqueous solutions with different scavenger concentrations. To this end, many experimental tests were performed in order to find the best experimental condition for reducing the uncertainties. A software was developed for quantitative analysis of the electrophorese image, offering the most important tools for accurate quantification of the DNA products. An important reduction on uncertainties was achieved, allowing the extension of experimental studies to the low scavenger concentration region. The results are in good agreement with experimental data at those conditions where these experiments were already performed, and in agreement with the theoretical model where there are no experimental results to compare with.

Estudo in vitro dos efeitos radiobiológicos no DNA plasmidial com radiações ionizantes de baixo LET