Radiation and the Environment Nuclear Changes. Fission vs. Fusion.

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<ul><li><p>Radiation and the EnvironmentNuclear Changes</p></li><li><p>Fission vs. Fusion</p></li><li><p>Fission</p></li><li><p>FissionNuclei of some elements can spontaneously lose particles or give off high energy radiation, split apart, or fuse together.Natural radioactive decay is a nuclear change in which unstable isotopes spontaneioudly emit fast-moving particles The left-overs are isotopes.</p></li><li><p>Nuclear (Fission) Chain Reaction</p><p>Fig. 2-6, p. 28Stepped ArtNeutron</p></li><li><p>Half LifeEach Isotope decays at a specific rate characteristic of that isotope. When one half of the original sample is leftover, that time is the isotopes half-life.The shorter the half-life the more radioactive the particle. </p></li><li><p>FissionControlled chain reactions are what power our nuclear reactors.Uncontrolled chain reactions are what cause a nuclear explosion. </p></li><li><p>Nuclear FusionWhile splitting an atom is called fission. Combining atoms is called fusion. It releases an enormous amount of energy. Only found in stars.</p></li></ul>