Radioactivity
Radioactivity originates from extraterrestrial sources and terrestrial geologic sources. All elements with more than 83 protons (i.e., an atomic number greater than 83) are radioactive. ...
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Radioactive Decay
The nucleus of each atom has a specific number of protons and neutrons and is either stable or unstable, depending on the relative number of each. The most stable atoms are those tha...
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Radioactivity
Radioactivity is the process in which unstable atomic nuclei become more stable by spontaneously emitting highly energetic particles and/or energy. A sample of material is said to be rad...
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Radioactive Decay
Radioactive decay is the process in which an atom emits another particle or particles. A radioactive element exhibits fewer decays per unit of time at an exponential rate. The half-l...
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Radioactivity
Radioactivity is the process in which unstable atomic nuclei become more stable by spontaneously emitting highly energetic particles and/or energy. A sample of material is said to be rad...
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Radioactivity
Radioactivity is defined as the process by which atoms emit particles and high energy rays from their nuclei. Although most elements can be rendered radioactive, the process occurs natur...
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Radioactive Decay
Radioactive decay is the process by which an atomic nucleus undergoes a spontaneous change, emitting an alpha particle or beta particle and/or a gamma ray. Radioactive decay is a nat...
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Radioactivity
In 1896, the French physicist Henri Becquerel accidentally found that an ore of uranium, pitchblende, emits an invisible form of radiation, somewhat similar to light. The phenomenon wa...
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The Discovery of Radioactivity: Gateway to Twentieth-Century Physics
Overview
Radioactivity was one of several discoveries made at the turn of the twentieth century that led to revolutionary changes i...
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After Antoine Becquerel's discovery of radioactivity in 1896, there was much speculation as to the nature of the phenomenon. For one thing, it was unclear whether this was an effect produced only by u...
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Radioactivity
Radioactive Decay
Radioactivity
Radioactive Decay
Radioactivity
Radioactive Decay
The Discovery of Radioactivity: Gateway to Twentieth-Century Physics