Experiência preliminar da leitura do gel MAGIC-f com espectrofotometria

Abstract

This work aims to begin experimentation with the MAGIC-f gel by reading it using spectrophotometry, available in the UTFPR laboratory, in order to investigate the predictions of this reading technique and propose an alternative methodology for reading polymer gels, since It is a relatively simple reading technique that can be obtained within the academic environment, but has not yet been explored. To this end, a pilot study was carried out with two MAGIC-f gel samples stored in quartz cuvettes, só that one was irradiated with 30 Gy in a linear accelerator (AL) from a private clinic and the other was used as a control. In addition, secondary research was carried out, with two samples of MAGIC-f gel stored in quartz cuvettes, in which one sample was irradiated with 50 Gy and the other used as control, and with 25 samples of this dosimetric gel stored in glass cuvettes. Optical, with five used as controls and the remaining irradiated with 15 Gy, 30 Gy, 40 Gy and 50 Gy – five samples being irradiated per dose. After six days of irradiation, the cuvettes were observed in the spectrophotometer, in the Ultraviolet and Visible Light (UV/Vis) regions of the electromagnetic spectrum, available at the FotoNanoBio Laboratory, at UTFPR. In this way, the transmission spectra generated were observed and compared with the data obtained by the equipment, só that the existing differences provided useful information related to the measurement of the absorbed dose. Thus, it was noted that the irradiated and non-irradiated samples have different transmittance measurements, making it possible to relate the absorbed radiation dose measurement with the use of spectrophotometric reading based on this differentiation. Even, doses lower than 30 Gy proved to be more cohesive and reproductive, especially between 400 nm and 600 nm. It was inferred that the spectrum in the UV region does not have a significant difference in signal due to the radiation dose, thus influencing the choice of cuvette material, since quartz cuvettes are not of paramount importance for this method. Reading and can be replaced with optical glass cuvettes, without any loss of reading. Therefore, with the completion of this project it was concluded that the preliminary data predicting the reading technique proposed for the dosimetric gel in question are overwhelming and a methodology for manufacturing and reading the MAGIC-f gel by spectrophotometry was proposed.