In this work, it is reported that the gamma-irradiated (2,41 MGy accumulated dose) glasses As2S3 (~2 mm thick) and Ge15,8As21S63,2 (~1 mm thick), both measured ~10 years after gamma-irradiation, exhibit radiation-induced optical darkening effect (i.e., long-wave shift of fundamental optical absorption edge). In the case of As2S3 glass, the observed long-term radiation-induced optical darkening effect is well comparable with that reported in literature for gamma-irradiated (~3 MGy accumulated dose) glass As2S3 (1,5 mm thick), measured directly after gamma-irradiation. In view of practical application, this finding demonstrates the possibilities for development of innovative chalcogenide glass based long-term dosimeter systems with stable and controlled parameters. A possible general criterion for mechanisms of long-term radiation-induced structural changes in chalcogenide glasses has been also considered.

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