An example of radioactive pollution can be the release of ionizing radiation into the environment as a result of human activity. Ionizing radiation includes x-rays and gamma rays.

Some of the commonly known radioactive contaminants are :

• Caesium-137: It is used for radiation therapy in medicine particularly to treat cancer.

• Strontium-90: Strontium is used in portable power sources for weather stations and space vehicles. 

For more relevant articles refer to the links given below:

• UPSC Environment and Ecology Questions
• Conservation of Biodiversity
• UPSC Environment and Ecology