Fresh fruits and vegetables 2. Unrefined grains 3. Beans and plant seeds 4. Visible light is an example of electromagnetic waves. This is a kind of radiation that doesn't cause cancer.
Some electromagnetic radiation does cause cancer though.
C. Radioactive elements emit radiation 1. A radioactive element has an extra neutron, or several extra 2. An example is carbon 14. Carbon 12, the stable form, has 6 protons and 6 neutrons. Carbon 14, the radioactive isotope, has 6 protons and 8 neutrons.