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radioactive alpha decay beta decay gamma decay nuclear reaction half-life activity fission chain reaction fusion
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Radioactive Decay
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In 1899, Ernest Rutherford and his colleagues discovered that the element radon spontaneously splits into a lighter nucleus and a light helium nucleus That same year, Rutherford also discovered that uranium compounds produce three different kinds of radiation He separated the types of radiation according to their penetrating ability and named them (alpha), (beta), and (gamma) radiation Alpha radiation can be stopped by a thick sheet of paper, while 6 mm of aluminum is needed to stop most beta particles Several centimeters of lead are required to stop gamma rays Alpha decay An alpha particle is the nucleus of a helium atom, 4He The 2 emission of an particle from a nucleus is a process called alpha decay The mass number of an particle, 4He, is 4, and the atomic number is 2 2 When a nucleus emits an particle, the mass number, A, of the decaying nucleus is reduced by 4, and the atomic number of the nucleus, Z, is reduced by 2 The element changes, or transmutes, into a different element For example, 238U transmutes into 234Th through alpha decay 92 90 Beta decay Beta particles are electrons emitted by the nucleus The nucleus contains no electrons, however, so where do these electrons come from Beta decay occurs when a neutron is changed to a proton within the nucleus In all reactions, charge must be conserved That is, the charge before the reaction must equal the charge after the reaction In beta decay, when a neutron, charge 0, changes to a proton, charge 1, an electron, charge 1, also appears In beta decay, a nucleus with N neutrons and Z protons ends up as a nucleus of N 1 neutrons and Z 1 protons Another particle, an antineutrino, also is emitted in beta decay Gamma decay A redistribution of the energy within the nucleus results in gamma decay The ray is a high-energy photon Neither the mass number nor the atomic number is changed in gamma decay Gamma radiation often accompanies alpha and beta decay The three types of radiation are summarized in Table 30-1 Radioactive elements often go through a series of successive decays until they form a stable nucleus For example, 238U undergoes 14 separate 92 decays before the stable lead isotope 206Pb is produced 82
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30 Nuclear Physics
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Table 30-1
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The Three Types of Radiation Alpha Particle Charge 2 Least penetration Transmutes nucleus: A A 4 Z Z 2 N N 2 Beta Particle Charge 1 Middle energy Transmutes nucleus: A A Z Z 1 N N 1 Gamma Ray No charge Highest penetration Changes only energy: A A Z Z N N
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Nuclear Reactions and Equations
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A nuclear reaction occurs whenever the energy or number of neutrons or protons in a nucleus changes Just as in chemical reactions, some nuclear reactions occur with a release of energy, while others occur only when energy is added to a nucleus One form of nuclear reaction is the emission of particles by radioactive nuclei The reaction releases excess energy in the form of the kinetic energy of the emitted particles Two such reactions are shown in Figure 30-3 Nuclear reactions can be described by words, diagrams, or equations The symbols used for the nuclei in nuclear equations make the calculation of atomic number and mass number in nuclear reactions simpler For example, the equation for the reaction in Figure 30-3a is as follows
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238U 92
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234Th 90
4He 2
The total number of nuclear particles stays the same during the reaction, so the sum of the superscripts on each side must be equal: 238 234 4 The total charge also is conserved, so the sum of the subscripts on each side must be equal: 92 90 2 0 In beta decay, an electron, 0e, and an antineutrino, 0 , are produced 1 (The symbol for the antineutrino is the Greek letter nu with a bar over it; the bar denotes a particle of antimatter) The transmutation of a thorium atom by the emission of a particle is shown in Figure 30-3b
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