What is the primary source of gamma rays?

• A. Cosmic radiation
• B. Radioactive decay
• C. Nuclear fission
• D. Solar flares

Answer: (B)

Gamma rays are a form of high-energy electromagnetic radiation typically emitted during radioactive decay. In this process, unstable atomic nuclei lose energy by emitting radiation in the form of gamma rays. This decay can occur in various types of radioactive materials, including isotopes found in nature and those used in nuclear medicine or generated in nuclear reactors.

While cosmic radiation and solar flares can also produce gamma rays, the primary and most consistent source of gamma rays is indeed from radioactive decay. Nuclear fission, which occurs in nuclear reactors and atomic bombs, can produce gamma rays, but it is not the main source. Thus, the most comprehensive and widespread source of gamma rays, particularly in terms of natural background radiation, is through the process of radioactive decay.