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| Home smoke detectors and to measure levels of toxic substances in plant samples |
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| Used to inspect airline luggage for explosives and land mines. Also to gauge moisture levels at construction sites and in farm silos |
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| Widely used in nuclear medicine. Injected into patients with cancer. Beta emissions act as a camera and used with computers to highlight tumor growths and abnormalties |
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| Diagnose/treat thyroid cancer and Grave's disease. Tracer elements in humans. |
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| Fuel source for over 20 NASA spacecraft missions.Used to power a long-lasting spacecraft battery |
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| Used to date historic organic matter |
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| Theorized matter is made of atoms |
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| Proved Democritus's theory. Law of multiple proportion |
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| Cathode rays to discover electron |
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| Oil drop experiment to find charge of electron |
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| Modern model of atom. Gold foil. Discovered the nucleus. |
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| Studied uranic rays. Discovered new elements that emitted these rays |
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