Radiation-induced paramagnetic centers in Bioglass (R)

The X-band (v = 9.4 GHz) electron spin resonance (ESR) and thermally stimul ated luminescence (TSL) spectra of the UV-, X-, and gamma -irradiated Biogl as(R) samples of different composition (Bioglass(R)I and Bioglass(R)II) hav e been investigated. The efficiency of generation of electron and hole cent ers strongly depends on basic Bioglass(R) composition and is almost indepen dent of ionizing radiation type and presence of Fe3+ non-controlled impurit y in the glass network. The spin Hamiltonian parameters (g and a values) an d thermal stability of the radiation-induced centers have been evaluated. T he results of TSL measurements show good agreement with ESR data Energetic structure, formation peculiarities and specific models of the radiation-ind uced paramagnetic centers in the Bioglass(R) network are discussed.