Thorium compounds are chemical substances that contain the element thorium, which is a naturally occurring radioactive metal. These compounds can be found in various forms, such as thorium dioxide (ThO2) and thorium nitrate (Th(NO3)4). They are primarily used in nuclear applications, including as fuel in nuclear reactors and in the production of nuclear energy. Due to their radioactive properties, thorium compounds must be handled with care. They are also being researched for potential use in advanced nuclear technologies, as thorium is more abundant than uranium and produces less long-lived radioactive waste. This makes thorium compounds an area of interest for sustainable energy solutions.