1 Study of the use of sodium thiocyanate as an indicator for three-dimensional dosimetry

Iasmin Vieira Nishibayaski; Anna Luiza Fraga da Silveira; Luiz Cláudio Meira Belo

doi:10.29384/rbfm.2024.v18.19849001809

Authors

Iasmin Vieira Nishibayaski Centro de Desenvolvimento da Tecnologia Nuclear
Sra. Centro de Desenvolvimento da Tecnologia Nuclear
Sr. Centro de Desenvolvimento da Tecnologia Nuclear

DOI:

https://doi.org/10.29384/rbfm.2024.v18.19849001809

Keywords:

Fricke Gel, three-dimensional dosimetry, optics.

Abstract

Three-dimensional dosimetry allows the determination of dosimetric quantities with a volumetric gradient. With Fricke Gel it is possible to make measurements of this nature due to the restriction of ions in this dosimeter caused by the presence of a gelatinous matrix. When ion indicators are added to Fricke Gel, the diffusion of the ions is further hampered and, in addition, the use of optical measurement techniques for the determination of the absorbed dose becomes possible. In this study, a new ferric ion indicator possibility for Fricke Gel is evaluated. Sodium thiocyanate was added to the Fricke Gel matrix and the effect of this addition was analyzed in a gamma radiation field and in a high-energy electron beam. The obtained results demonstrated the possibility of using this indicator as a binding agent in the Fricke Gel dosimeter. In the gamma irradiation field, the dosimeter showed a linear response with the absorbed dose between 5 Gy and 150 Gy, in addition to presenting visual evidence of the spatial distribution of the radiation field to which it is subjected.

Downloads

Download data is not yet available.

References

Ibbott GS. Applications of gel dosimetry. Journal of Physics: Conference Series. 2004; 58(19).

International Commission on Radiation Units And Measurements. Prescribing, Recording, and Reporting Photon-Beam Intensity-Modulated Radiation Therapy (IMRT). ICRU Report 83, v.10, n.1, 2010.

Gore JC, kang YS, Schulz RJ. Measurement of radiation dose distributions by nuclear magnetic resonance (NMR) imaging. Physics in Medicine and Biology. 1984; 1189 (8).

Schreiner LJ. Review of Fricke gel dosimeters. Journal of Physics: Conference Series. 2004; 9(12).

Fricke H, Morse S. The action of X-rays on ferrous sulphate solutions. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 1929; 129 (12).

Scotti M, Arosio P, Brambilla E, Gallo S, Lenardi C, Locarno S, Orsini F, Pignoli E, Pedicone L, Veronese L. How Xylenol Orange and Ferrous Ammonium Sulphate Influence the Dosimetric Properties of PVA–GTA Fricke Gel Dosimeters: A Spectrophotometric Study. 2022; 1(17).

Oliveira BTC. Uso do sistema cobalto(II)/tiocianato para determinação espectrofotométrica de cobalto em diferentes matrizes [monografia]. Niterói (RJ): Universidade Federal Fluminense; 2016.

Olsson LE, Appleby A, Sommer J. A New Dosimeter Based on Ferrous Sulphate Solution and Agarose Gel. Applied Radiation and Isotopes. 1991; 1081(5).

Marrale M, d’Errico F. Hydrogels for Three-Dimensional Ionizing-Radiation Dosimetry. Gels. 2021; 7, 74.

Babic S, Battista J, Jordan K. Three-dimensional dose verification for intensity-modulated radiation therapy in the radiological physics centre head and neck phantom using optical computed tomography scans of ferrous xylenol–orange gel dosimeters. International Journal of Radiation Oncology, Biology, Physics. 2008; 1281 (10).

Warman JM, de Haas MP, Luthjens LH, Denkova AG, Tiantian Yao T. A Radio-Fluorogenic Polymer-Gel Makes Fixed Fluorescent Images of Complex Radiation Fields. Polymers 2018; 10, 685.