[en] Highlights: • Quantitative thermal imaging for Intermediate Level Waste container “fingerprinting”. • Determination of Intermediate Level Waste container internal temperatures. • Reliable determination of Special Nuclear Material containers surface temperature. • Non-radiance surface thermometry for the long term monitoring of SNM containers. • Remote identification of anomalous temperature 3 m³ ILW packages in stores. Many established nuclear power producing countries are currently decommissioning first and increasingly second-generation power producing plants and fuel processing facilities. This has led to a growing inventory of different containers and packages containing radioactive waste and other nuclear materials, as well as storage of spent fuel. Here we describe research to establish in-situ yet remote health monitoring techniques based on novel temperature measurement methods for different containers and racks used to hold different nuclear waste forms, special nuclear materials and spent fuel.