Radiations are increasingly being employed in various human activities, but ionizing radiation is carcinogen and its use should be associated with radiological protection. The use of passive luminescent dosimeters to determine absorbed dose over a period of exposure to radiation is a common practice around the world and in various Brazilian institutions. One of the shortcomings in dosimetry by optically stimulated luminescence (OSL) is the lack of variety of materials and methods of reading. This project aims to expand current knowledge of some interesting materials for OSL technique, but which have a limited bibliography. We will study beryllium oxide (BeO) and natural Brazilian fluorite (CaF2 contaminated with rare earth elements). The beryllium oxide is already recognized as good material for OSL dosimetry, but has not yet been studied extensively. The Brazilian fluorite is interesting for OSL dosimetry as it is an affordable and abundant material, besides being a good TL material. The OSL signal of these materials will be characterized observing the response of the material to different types of radiation, correlating the OSL signal with the TL signal and determining the values of the signal life-times to carry out POSL measurements. The objectives of this work also include the integration of a light spectrometer to a Risø TL/OSL system, making possible the measurement of the TL spectra and, if possible, OSL spectra. The changes of light spectra with variations of sample temperature, wavelength of stimulating light and type of radiation will be investigated. This project may open new areas of study and provide alternative materials for OSL dosimetry in Brazil.
News published in Agência FAPESP Newsletter about the scholarship: