This Data Management Plan (DMP) supports the project "Predicting the long-term tolerance of functional materials for use in extreme radiation conditions" (LZP-2023/1-0453) funded by the Latvian Council of Science. The project focuses on understanding and predicting radiation damage and thermal annealing behavior in advanced optical and scintillator materials exposed to various types of high-dose radiation (gamma, proton, neutron, ion). The DMP outlines how data collected during experimental and theoretical investigations—such as spectroscopic measurements (optical, EPR, Raman), irradiation results, and simulation outputs—will be handled according to FAIR principles. The purpose of this DMP is to ensure that all research data are managed responsibly, stored securely, shared appropriately, and made openly available when possible via repositories such as Zenodo. This will support reproducibility, transparency, and long-term usability of the results. Project leader Dr.phys. Anatolijs Popovs. Project duration: 01.01.2024 - 31.12.2026. Total funding: 300 000 EUR.