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http://www.lanl.gov/science/1663/images/reactor.jpg
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Nuclear Bomb of 1945 known as “ fat man ” http://www.travisairmuseum.org/assets/images/fatman.jpg
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http://library.thinkquest.org/06aug/01200/Graphics/705px-Nuclear_fireball.jpg
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Depends on the neutron to proton ratio Protons & neutrons are held together by the Band of Stability
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Isotopes of certain unstable elements that emit particles and energy from the nucleus. Nuclei with atomic number > 83 are radioactive in 1896 accidentally observed radioactivity of uranium salts that were fogging photographic film. His associates were Marie and Pierre Curie.
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Lived in France 1898: discovered the elements and. http://www.radiochemistry.org/nuclearmedicine/pioneers/images/mariecurie.jpg
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Winner of 1903 Nobel Prize for Physics with Henri Becquerel and her husband, Pierre Curie Winner of the sole 1911 for Chemistry.
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Emission of : helium nuclei two and two charge +2e can travel a few inches through air can be stopped by a or.
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Uranium Thorium
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http://education.jlab.org/glossary/alphadecay.gif
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Beta particles : ejected from the nucleus when neutrons decay n -> p + + - Beta particles have the same charge and mass as "normal" electrons. Can be stopped by or a.
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Thorium Protactinium
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Gamma radiation energy that is released. Gamma rays are electromagnetic. They have no mass. Gamma radiation has no charge. Most Penetrating, can be stopped by 1m thick or a several cm thick.
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They will undergo The type of decay depends on the reason for the instability
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Radioactive dating Radioactive dating – scientists can determine the approximate of an object based on the of certain radioactive nuclides present.
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Radioactive tracers Radioactive tracers are radioactive atoms that are incorporated into substances so that of the substances can be followed by radiation detectors. – Radioactive tracers can be used by doctors to. – Radioactive tracers are also used in agriculture to determine the effectiveness of fertilizers.
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Irradiated Food Irradiated Food – nuclear radiation is used to of food.
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Nuclear Power Plants Nuclear Power Plants – use energy as heat from nuclear reactors to. They have five main components: 1.Shielding – radiation-absorbing material used to decrease exposure to radiation from nuclear reactors. 2. Fuel – usually Uranium-235. 3.Coolant – usually water, it absorbs excess heat energy. 4.Control rods – neutron-absorbing rods that limit the number of free neutrons 5.Moderator – used to slow down the fast neutrons produced by fission.
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Rem Rem – The unit used to measure the biological effects of in humans.
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