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The three types of nuclear radioactive decay are alpha, beta and gamma emission. ... It is produced as a step in a radioactive decay chain when a massive nucleus produced by fission relaxes from the excited state in which it first formed towards its lowest energy or ground-state configuration.
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www2.slac.stanford.edu/vvc/theory/nuclearstability.html
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Alpha Decay ... The reason alpha decay occurs is because the nucleus has too many protons which cause excessive repulsion. In an attempt to reduce the repulsion, a Helium nucleus is emitted. ... Beta decay occurs when the neutron to proton ratio is too great in the nucleus and causes instability. In basic beta decay,
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library.thinkquest.org/3471/radiation_types_body.html
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Beta decay - Wikipedia, the free encyclopedia
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In nuclear physics, beta decay is a type of radioactive decay in which a beta particle (an electron or a positron) is emitted. In the case of electron emission, it is referred to as beta minus (),...
en.wikipedia.org/wiki/Beta_decay
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The applet lists a "halflife" for each radioactive isotope. What does that mean? ... The halflife is the amount of time it takes for half of the atoms in a sample to decay. The halflife for a given isotope is always the same ; ... That's exactly right. Here's another applet that illustrates radioactive decay in action.
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www.colorado.edu/physics/2000/isotopes/radioactive_deca...
www.colorado.edu/physics/2000/isotopes/radioactive_decay3.html
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Here we study radioactive decay. Shown (red dots) is a large number of identical atomic nuclei, each obeying the same decay law. Now select the half life time of the nuclei with the slider, press the strat button, and watch them decay away as a function of time (displayed in the upper right corner).
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lectureonline.cl.msu.edu/~mmp/applist/decay/decay.htm
lectureonline.cl.msu.edu/~mmp/applist/decay/decay.htm
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How Does Radioactive Decay Work? ... Generally, there are four main concepts that students struggle with when thinking about radioactive decay: ... Radioactivity and radioactive decay are spontaneous processes. Students often struggle with this concept; therefore, it should be stressed that it is impossible to know exactly...
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serc.carleton.edu/quantskills/methods/quantlit/RadDecay...
serc.carleton.edu/quantskills/methods/quantlit/RadDecay.html
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Students generate a radioactive decay table for an imaginary element (designed to simplify the math), use their data to plot a decay graph, develop the concept of half-life, and use the graph to "age" several samples.
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www.accessexcellence.org/AE/AEPC/WWC/1995/teach_rad.htm...
www.accessexcellence.org/AE/AEPC/WWC/1995/teach_rad.html
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The discovery of the natural radioactive decay of uranium in 1896 by Henry Becquerel, the French physicist, opened new vistas in science. ... Radioactive decay is a spontaneous process in which an isotope (the parent) loses particles from its nucleus to form an isotope of a new element (the daughter).
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pubs.usgs.gov/gip/geotime/radiometric.html
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