What are the sources of gammer ray?

Gamma rays originate from various sources, primarily in astrophysical phenomena such as supernovae, neutron stars, and black holes. They can also be produced by radioactive decay of certain isotopes, such as cobalt-60 or cesium-137, and in nuclear reactions. Additionally, gamma rays are emitted during certain types of particle interactions and collisions in high-energy physics experiments. On Earth, they can be generated by lightning and cosmic rays interacting with the atmosphere.