SILVA, J.O.NONATO, F.B.C.SAMPAIO, F.G.A.CALDAS, L.V.E.2018-12-102018-12-102018SILVA, J.O.; NONATO, F.B.C.; SAMPAIO, F.G.A.; CALDAS, L.V.E. Evaluation of some dosimetric properties of a dedicated plane parallel ionization chamber for radiotherapy electron beams. <b>Brazilian Journal of Radiation Sciences</b>, v. 6, n. 3, p. 1-13, 2018. DOI: <a href="https://dx.doi.org/10.15392/bjrs.v6i3.547">10.15392/bjrs.v6i3.547</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/29345.2319-0612http://repositorio.ipen.br/handle/123456789/29345Ionization chambers are the reference detectors for electron beam dosimetry. In this paper a dedicated radiotherapy plane parallel ionization chamber manufactured with low cost materials is presented for dosimetry in electron beams. The ionization chamber tested has a sensitive volume of 0.4 cm³. Both the collecting electrode and the guard ring were painted with a homogeneous mixture of nail polish and graphite. The dedicated ionization chamber presented a linear response with electron absorbed dose within the range 0.5 to 8.0 Gy, an increase of its response with the field size increasing, an angular dependence within ±5°, as recommended by international standards, and a polarity effect of 0.78% according to the field size. Considering the results obtained, it is possible to conclude that the plane parallel ionization chamber tested in this work presents potential use for elec - tron beam dosimetry in clinical routine.1-13openAccessabsorbed radiation dosesdosimetryelectron beamsionization chambersperformancephantomsplanningradiotherapyArtigo de periódico3610.15392/bjrs.v6i3.547aguardandohttps://orcid.org/0000-0002-7362-2455