Absorption of high-purity glasses with different concentrations of Fe3+ colored by gamma radiation

This paper determines the charge state of the electron and hole color centers producing the additional absorption bands (AA) in silicate glasses subjected to gamma irradiation and determines the absorption cross sections and the absolute concentrations of these centers. All the measurements were made on specially synthesized glasses of high purity. The signs of the trapped carriers and the absorption cross section of the hole color centers (CC) were determined using a polyvalent additive of F3+. The glasses were subjected to gamma irradiation at doses of 104-2.107 rd at room temperature. Neutral or oxidizing synthesis conditions were provided by bubbling nitrogen or oxygen through the glass melt. Four bands appear in the additional absorption spectrum after the radiation coloring of sodium calcium silicate glasses of high purity synthesized under neutral and oxidizing conditions. In both industrial and the particularly pure experimental glasses the kinetics and magnitude of the radiation-induced absorption are largely determined by the radiation reduction of the trivalent iron in the glass