Edible salt contains no radioactive elements at all.
Radiation means that elements spontaneously emit rays from unstable nuclei (such as alpha rays, beta rays, gamma rays, etc.). ) and decay to form stable elements and stop emission (decay products). This phenomenon is called radioactivity. The energy released in the process of decay is called decay energy. All elements with atomic number above 83 (bismuth) are radioactive, but some elements with atomic number below 83 (such as technetium) are also radioactive.