Abstract
The influence of glass composition on the sensitivity to ionizing radiation as well as on the radiophotoluminescence ‘build-up’ kinetics is studied in silver doped glass system XNaPO3, (100 - X)Ca(PO3)2, where X varied from 0 to 100 mol%. Concentration of Ag2O was 0.1 wt%. All glass compositions were prepared in a globar-heated furnace at 1000–1200°C. Gamma-irradiated glasses, containing radiation-induced paramagnetic centers of photoluminescence, were investigated by electron spin resonance and luminescence spectroscopic methods. The variation of NaPO3 concentration from 100 to 40 mol% have decreased the glass sensitivity to gamma-radiation more than 800 times and simultaneously have increased the ‘build-up’ time of radiophotoluminescent centers. Room temperature stable Ag0 atoms were detected in the glass, containing 40 mol% NaPO3 and less. Results are discussed based on the model of post-radiational relaxation. It is shown that all effects found in this work are caused by the decrease of Ag+ ion mobilities with decrease of alkali content in the glass.
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