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The aim of this work is to develop a DL-Alanine, Fe-ll based gel dosimeter to be applied in the dosimetry of the Co-60 gamma-radiation fields in the dose range of radiation therapy procedures. The aminoacid DL-Alanine is dissolved in an acid solution containing the Fe-ll and added to the gel. A series of essays was performed with different chemicals and different procedures were made to evaluate the behavior of the obtained dosimetric gel as function of the time. The absorption spectra, before and after the irradiation, present maximum in 457 nm and 588 nm, respectively. These two peaks correspond to absorption wavelengths of the chemical species Fe-ll and Fe-lll, respectively, both species being in equilibrium. With the irradiation, the formation of the radicals that oxide the Fe-ll into Fe-lll occurs, altering the chemical balance of both species hence the increase of the Fe-lll and causing the gel to change its tonality, in such a way that it is possible to determine the absorved dose. In the analysis of the spectra and respective dose-response curves it was observed that the dosimetric gel shows linearity in dose range of 0.5 to 40 Gy. From the obtained linearity results, stability and lower detectable dose 0,3 Gy it is possible to conclude that the present DL-Alanine, Fe-ll based dosimetric gel presents an excellent potential to the application to which it is proposed, namely, the determination of the dose fields in radiation therapy and its future application as a standard in the determination of these fields, in 3D, using the Magnetic Resonance Imaging.

Desenvolvimento e caracterização de um gel de alanina para aplicação na medida da distribuição da dose de radiação usando a técnica de espectrofotometria