For Radioactivity we have terms and definitions in 11 topics. The topics are Chemistry, Electric Power, Energy, Environment, Evolution, Explosives, Geography, Nuclear, Nuclear Science, Oceanography and Planetary Science.

Radioactivity (Chemistry)

The emission of subatomic particles from a nucleus.

Radioactivity (Electric Power)

The spontaneous decay of an unstable atomic nucleus, giving rise to the emission of radiation.

Radioactivity (Energy)

The spontaneous emission of radiation from the nucleus of an atom. Radionuclides lose particles and energy through this process.

Radioactivity (Environment)

The spontaneous emission of matter or energy from the nucleus of an unstable atom (the emitted matter or energy is usually in the form of alpha or beta particles, gamma rays, or neutrons).

Radioactivity (Evolution)

The emission of energy due to changes in the nucleus of an atom. Such spontaneously released radiation is a characteristic of certain elements and at some levels can be harmful.

Radioactivity (Explosives)

Radioactivity, the spontaneous disintegration or decay of the nucleus of an atom by emission of particles, usually accompanied by . Electromagnetic Radiation. Natural radioactivity is exhibited by several elements, including Radium and Uranium. The radiation produced is of three types: the alpha particle, which is a nucleus (two protons and two neutrons) of an ordinary helium atom; the beta particle, which is a high-speed electron or, in some cases, a positron (the electron's antiparticle); and Gamma Radiation, which is a type of electromagnetic radiation with very short wavelengths. The rate of disintegration of a radioactive substance is commonly designated by its half-life, which is the time required for one half of a given quantity of the substance to decay. Radioactivity may be induced in stable elements by bombardment with particles of high energy. Also Dating; Isotope.

Radioactivity (Geography)

The spontaneous emission of radiation from atomic nuclei

Radioactivity (Nuclear)

The spontaneous decay or disintegration of an unstable atomic nucleus accompanied by the emission of radiation.

Radioactivity (Nuclear Science)

The spontaneous decay of disintegration of an unstable atomic nucleus accompanied by the emission of radiation.

Radioactivity (Oceanography)

Radioactivity is the spontaneous disintegration or decay of the nucleus of an atom. In the process particles are emitted accompanied by electromagnetic radiation. These are harmful to life, so radioactive materials must be handled with extreme care.

Radioactivity (Planetary Science)

The spontaneous breaking apart, or decay, of unstable nuclei in isotopes. The unstable radioactive isotope is called the parent, and the products of the decay of the parent are called the daughter isotopes.

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