On the optical properties of irradiated cobalt glass and other glasses

The optical properties of cobalt glass and other glasses, when they are irradiated by γ-ray, electron beam and neutron flux, are investigated. The change of their transmissivity is studied over 320 -- 1000mμ wave length range. Fading phenomena, time variation and temperature dependence are studied. The time dependence of the fading is expressed by the formula which is proportional to tsup(-lambda) approximately (lambda is constant). From the excitation curve, four or more centers can be assigned. Refering to the ESR-measurements and other works, the structure of these centers are determined and the production mechanism is discussed. These interpretation can explaine the experimental results well. (auth.)