... and neutrons); that is, a non-radioactive (stable) element. This is most frequently accomplished by the emission of alpha particles (helium nuclei); beta particles (electrons and positrons); or gamma radiation (electromagnetic waves of very high frequency). Each state or step will have its own unique characteristics of half-life and type of radiation. It takes place either directly, through one-step decay ... known to man - In nuclear power stations, fission takes place in a nuclear reactor. - The nuclei of uranium or, more rarely, plutonium are induced to split, releasing large amounts...

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• Grade Level: Undergraduate

... the excited state and back again to ground state. The energy released from this is given out as light and not reflected back to the source in anyway. Free radiating waves issued from an atom which have been stimulated to emit radiation are reflected back using reflected surfaces. Light wave-energy is thus reflected back to the source stimulating more atoms ... on the surface f the work-piece. The highly focused, high density melts and evaporates portions of the work-piece in a controlled manner. Types of layers used: Co2(pulsed or continuous waves). Nd:YAG(neodymium:yttrium-aluminum-gar...

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• Grade Level: High School

Radiation is energy that comes from a source and travels through some material or through space. Light, heat and sound are types of radiation. The kind of radiation discussed in this presentation is called ionizing radiation because it can produce charged particles (ions) in matter. Ionizing radiation is ... radiation. Ionizing radiation can also be produced by devices such as X-ray machines Characteristics of Gamma Radiation and X-Rays 1. Gamma radiation and X-rays are electromagnetic radiation like visible light, radio waves, and ultraviolet light. These electromagnetic radiations differ o...

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• Approx Pages: 8
• Grade Level: High School