Transmission properties of heavy-germanate glasses as hosts for scintillating rare earths

In this work a set of heavy-germanate glasses used as hosts for scintillating rare earths are analysed. Glasses were prepared from GeO 2 , BaO, Gd 2 O 3 , and SnO 2 (or La 2 O 3 ) as starting materials. Some glasses contain certain amounts of Ce 2 O 3 , which introduces Ce 3+ activator ions in the matrices. Special attention was paid to the influence of the glass composition on transmission properties in the ultraviolet and visible spectral regions; the relationship between the ultraviolet absorption edge and the content of the metals present in the glass structure is discussed. The irradiation resistance of samples was valued by comparing their transmission spectra before and after irradiation. An improvement in radiation resistance was observed when cerium was added in the glass composition.