Radioactivity – UPSC Prelims
Radioactivity: Radioactivity is the phenomenon of spontaneous emission of particles or waves from the unstable nuclei of some elements. There are three types of radioactive emissions: Alpha, Beta and Gamma. Alpha particles are positively charged He (Helium) atoms, beta particles are negatively charged electrons and gamma rays are neutral electromagnetic radiations. Radioactive elements are naturally found in the earth’s crust. Uranium, thorium and …