On the luminescence properties of CaSO4:Ce.
Radiat Prot Dosimetry
; 100(1-4): 365-8, 2002.
Article
en En
| MEDLINE
| ID: mdl-12382899
The luminescent properties of cerium doped calcium sulphate are studied: fluorescence and excitation spectra, optical absorption and thermoluminescence (TSL). It is known that, in rare earth doped CaSO4, only cerium induces a strong 400 degrees C TSL peak. In CaSO4:0.2%Ce samples synthesised under oxidising conditions, the recovery step of Ce3+ fluorescence is correlated with the 400 degrees C TSL peak readout, as mentioned by Nair er al. Our results indicate that an oxidation of Ce3+ ion does occur under X-irradiation (Ce3+ --> Ce4+), followed by a complete return to the trivalent state after thermal annealing at about 500 degrees C; our results confirm the hypothesis of Nair et al that Ce3+ ions are oxidised by ionising irradiation. So, a pure redox reaction seems the most probable for the 400 degrees C TSL peak of CaSO4:Ce. Moreover, the use of the 400 degrees C TSL peak for high temperature dosimetry applications is discussed.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Dosimetría Termoluminiscente
/
Sulfato de Calcio
Idioma:
En
Revista:
Radiat Prot Dosimetry
Año:
2002
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
Reino Unido