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Radioactivity - Radioactivity Wilhelm Roentgen(1895...

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Radioactivity Wilhelm Roentgen (1895) discovered that when cathode rays struck certain materials (copper for example) a different type of ray was emitted. This new type of ray, called the "x" ray had the following properties: The could pass unimpeded through many objects They were unaffected by magnetic or electric fields They produced an image on photographic plates (i.e. they interacted with silver emulsions like visible light) Henri Becquerel (1896) was studying materials which would emit light after being exposed to sunlight (i.e. phosphorescent materials). The discovery by Roentgen made Becquerel wonder if the phosphorescent materials might also emit x- rays. He discovered that uranium containing minerals produced x-ray radiation (i.e. high energy photons). Marie and Pierre Curie set about to isolate the radioactive components in the uranium mineral. Ernest Rutherford studied alpha rays, beta rays and gamma rays, emitted by certain radioactive substances. He noticed that each behaved differently in response to an
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