Dose-response of Fricke- and PAGAT-dosimetry gels in kilovoltage and megavoltage photon beams: Impact of LET on sensitivity

VEDELAGO, JOSÉ; CHACÓN, DAVID; ROMERO, MARCELO; VENENCIA, DANIEL; MATTEA, FACUNDO; VALENTE, MAURO

PHYSICA MEDICA

IST EDITORIALI POLGRAFICI INT

Año: 2021 vol. 84 p. 41 - 41

1120-1797

urpose: Dosimetry of ionizing radiation quantifies the energy deposited by an incident beam to the medium. This study presents the relative response of two types of gel dosimeters describing their differences by estimating radiation chemical yields produced in water radiolysis. Methods: Two types of gel dosimeter were used, namely an acid ferrous ion solution infused with xylenol orange known as Fricke gel and a polymer gel based on acrylamide and N,N?-methylenebis(acrylamide) known as PAGAT. Samples were irradiated using two photon beam energies, one from a conventional X-ray tube operated at 44 kV and the other one from a LINAC operated at 6 MV. The dosimeters were analyzed by optical absorbance and magnetic resonance imaging. Additionally, the linear energy transfer of each beam was calculated using Monte Carlo simulations for further estimation of the radiation chemical yields produced during water radiolysis. Results: Obtained results for both gel dosimeters indicate that their r