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    STUDIA PHYSICA - Ediţia nr.2 din 2008  
         
  Articol:   EPR STUDY OF RADIATION INDUCED PARAMAGNETIC SPECIES IN ALUMINOSILICATE COMPOUNDS.

Autori:  EMILIA S. VANEA, VIORICA SIMON. 		 
       
         
  Rezumat:  Electron paramagnetic resonance (EPR) spectroscopy was used to characterize paramagnetic centres occurring in gamma ray irradiated aluminosilicate systems containing rare earth and/or iron that may be used for biomedical applications. The investigated samples were obtained following the sol-gel route. After drying at 110°C the samples were heat-treated at 500°C or 1200°C. Usually the sterilisation of such biomedical compounds is realized with gamma rays. For this reason the samples were gamma irradiated and investigated with respect to possible occurrence of nocuous irradiation effects. The EPR studies demonstrate that various radiation-induced defects, like surface defects and peroxy-centres, are present in the analysed systems. A higher concentration of defects was detected for samples treated at 500°C, as compared to samples treated at 1200°C.

Key words: aluminosilicate compounds; gamma irradiation; paramagnetic centres; EPR. 
  
         
     
         
         
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