Alpha Particle, Helium nucleus, stopped by paper, Beta Particle, electron, stopped by aluminum, Gamma Ray, energy, stopped by lead and concrete, fission, splitting of a nucleus into 2 nuclei, fusion, fusing together of 2 nuclei into one nucleus, half life, how long it takes for one half of a radioactive element to decay, transmutation, the changing of one element into another, marie curie, discovered radium and polonium, henri becquerel, father of radioactivity, geiger counter, determines how radioactive something is

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