Artículos de revistas
Feasibility study of CaSO4:Tb,Yb as a thermoluminescent dosimeter
Fecha
2014-02Registro en:
Radiation Physics and Chemistry, Amsterdam : Elsevier, v. 95, p. 119-121, Feb. 2014
0969-806X
10.1016/j.radphyschem.2013.01.012
Autor
Junot, Danilo O.
Santos, Max A.
Chagas, Marcos A. P.
Santos, Marcos A. Couto dos
Nunes, Luiz Antônio de Oliveira
Souza, Divanizia N.
Institución
Resumen
A new composite based on CaSO4, using terbium as dopant and ytterbium as co-dopant (CaSO4:Tb,Yb), was developed for employment as a thermoluminescent (TL) dosimeter. The crystals used in this work were grown using a production route based on the Yamashita method (Yamashita et al., 1968). Crystal powder was calcined at 600 °C for 1 h. Pellets were made by adding commercial and colorless glass to improve physical resistance and sintered at 700 °C for 6 h. All samples were irradiated by a beta source (90Sr/90Y) and received doses from 1 Gy to 5 Gy. TL analyses have been performed and characteristics such as sensitivity, reproducibility, linearity, and fading have been studied. The CaSO4:Tb,Yb pellets glow curves presented two peaks, the first at around 115 °C, and the second at around 200 °C. The highest intensity was shown for CaSO4:Tb,Yb with a concentration of 0.1 mol% of Tb and Yb together. In all the samples the TL response was proportional to the absorbed dose. Therefore, the CaSO4:Tb,Yb has potential to be used as a thermoluminescent dosimeter.