Radioactivity: Types of Radioactive Emissions What is radioactivity in physics? Radioactivity:You may have heard of this statement “Danger : Radiation Kills”. Do you know that radiation can kill for a good purpose?The syringe and needle used by a doctor is cleaned by gamma radiation. What is radiation and how does it kill bacteria and other organisms? In 1896, … [Read more...] about Radioactivity: Types of Radioactive Emissions