Radioactivity dating to materials

radioactive waste,material containing the unusable radioactive byproducts of the scientific, military, and industrial applications of nuclear energy.Since its radioactivity presents a serious health hazard (see radiation sickness), disposing of such material is a great problem......A decay, also known as a disintegration of a radioactive nuclide, entails a change from an unstable combination of neutrons and protons in the nucleus to a stable (or more stable) combination. Radioactive atoms decay principally by alpha decay, negative beta emission, positron emission, and electron capture.

If there are multiple particles produced during a single decay, as in beta decay, their relative angular distribution, or spin directions may not be isotropic.Decay products from a nucleus with spin may be distributed non-isotropically with respect to that spin direction, either because of an external influence such as an electromagnetic field, or because the nucleus was produced in a dynamic process that constrained the direction of its spin.Such a parent process could be a previous decay, or a nuclear reaction.), and the process produces at least one daughter nuclide.actinide series,a series of radioactive metallic elements in Group 3 of the periodic table.Members of the series are often called actinides, although actinium (at. 89) is not always considered a member of the series......

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