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RADIOACTIVE DECAY(Unstable => Emission => Stable)NATURAL RADIOACTIVITY (Becquerel 1896)ARTIFICIAL RADIOACTIVITY (Curie/Joliot 1934)Bombardment of stable isotopes with particlesCyclotrons and Reactors, 2,700 radionuclidesMODES OF DECAYAlpha Decay ( α ++ ) 222 Rn => 218 Po + α ++Beta Decay ( β − ) 131 I => 131 Xe + β − + γ + νPositron Emission ( β + ) 18 F => 18 O + β + + νElectron Capture ( EC ) 111 In + e - => 111 Cd + x + νIsomeric Transition (IT) 99m Tc => 99 Tc + γ

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