Carcinogen

 Carcinogen is an example of mutagen, it is a chemical or physical agent that causes mutations.  A carcinogen is any substance, radionuclide, or radiation that is an agent directly involved in causing cancer. This may be due to the ability to damage the genome or to the disruption of cellular metabolic processes. 

 Several radioactive substances are considered carcinogens, but their carcinogenic activity is attributed to the radiation, for example gamma rays and alpha particles, which they emit. In conclusion, the carcinogen causes cancer, one neoplastic transformation of eukaryotic cells.