A tissue-equivalent radioluminescent fiberoptic probe for in-vivo dosimetry based on Mndoped lithium tetraborate

M SANTIAGO; M PROKIC; P MOLINA; J MARCAZZÓ; E CASELLI

Munich

Congreso; ,11th World Congress on Medical Physics and Biomedical Engineering; 2009

International Union for Physical and Engineering Sciences in Medicine (IUPESM)

The fiberoptic (FO) dosimetry concept, which relies on the assessment of dose by measuring the intensity of the light emitted by a tiny sample of a radioluminescent (RL) compound coupled to an optical fiber cable, is gaining importance as a promising dosimetry technique for in-vivo dosimetry. In this work the design, construction and test of a tissue-equivalent RL probe is described. The intensity of the RL emission of Mn-doped Lithium Tetraborate samples during irradiation is used as an estimate of the relative dose. The influence of spurious luminescence is discussed and a removing method based on simple optical filtering is implemented. Finally, the response of the probe in the context of a typical depth-dose experiment in a 60Co radiotherapy facility is analyzed and compared to the response of a standard ionizing chamber.