Nuclear Reactions. Nuclear Reactions
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1 Nuclear Reactions Result from transformations in the nucleus Involve protons and neutrons Often result in transmutation into more stable elements Participants: Energy Type Symbol(s) Charge Mass (g/particle) x - Low Alpha He, Intermediate Beta e, - 9.x-8 High Gamma Intermediate Positron + 9.x-8 Nuclear Reactions How the heck do we get an electron (-particle) out of (or in to) the nucleus??? Conversion of a neutron to a proton emission n e + p Conversion of a proton to a neutron e - capture p + e n Balancing Nuclear Reactions: Total number of nucleons (protons and neutrons) remains the same on both sides of the arrow. Total mass remains the same (matter isn't created or destroyed) Examples: Alpha emission from 6 Ra: Beta emission from Pb: Electron Capture by Ca:
2 Why Do Nuclear Reactions Occur? Reactions occur as the nucleus tries to reach a stable neutron:proton ratio Peninsula of Stability Ratio depends on "size" of nucleus Balance between proton repulsion and size Reactions continue until stable n:p ratio is reached Radioactive Decay All nucleii of atomic number > 8 are unstable Undergo spontaneous decay Merge into one of three (four?) decay series Uranium, thorium, actinium (neptunium?) 8 U, Th, 5 U, 7 Np
3 Energy Changes in Nuclear Reactions Something must hold the nucleus together. Nuclear Binding Energy: generally huge! Nucleus + Nucleon New Nucleus reaction is typically exothermic. Energy comes as a result of the mass defect: During nuclear synthesis, the mass of the new nucleus is always smaller than the masses of the component nucleons. This small, "missing mass" is apparently converted to energy (E =mc ). Because c is so large ( x 8 m/s) even a small mass defect gives rise to tremendous energy. MeV =.6 x - J ~ - J per amu mass defect 5 Kinetics of Radioactive Decay: Nucleus New Nucleus + Radiation Decay follows first-order rate law N ln t N Often talk about half-life, t / =.69/ Time needed for half of the material to undergo decay. (Time for N ½N ) Half-Lives vary from fractions of a second to millions of years. 6
4 Radiocarbon Dating: Application of Decay Kinetics C concentration (activity) in living material is essentially constant. (5 dpm/g carbon) C is continually being produced in the upper atmosphere. C is continually being consumed by living organisms in the carbon cycle. Once the living organism dies, -decay causes the activity to decrease. (t / = 57 years). First-order kinetics tells us how long the decay process has been occurring. Example: A wooden Japanese garden statue from the Kamakura period had a carbon- activity of.9 dpm/g in 99. What is the approximate age of the statue? 7 Alternative Energy Sources: Fission Fission Reactions: "Splitting" the nucleus. 5 9 U + n 6 U 9 56 Ba + Kr n Tremendous energy release (x kj/mol!!) This energy is transferred to heat in nuclear power plant. Production of neutrons/mol leads to chain reaction Provided critical mass is retained. 8
5 Fission Reactor Based Power Control rods (neutron absorbers) are used to regulate reaction. Requires uranium that is enriched in 5 U (<% naturally) Breeder Reactors: convert abundant, nonfissile 8 U to fissile material. Produces highly radioactive waste. Much with long half-life 9 Alternative Energy Sources: Fusion Several potential reactions, such as H H He Potential for a tremendous amount of energy Lots of deuterium in the ocean! Enough potential energy for,, years! So what s the holdup?!? n H H He n Requires tremendous amount of heat and pressure to sustatin ~,, K (hot!) Need to maintain and contain plasma Not radiation-free. Neutrons have to go somewhere! But much less waste than fusion 5
6 Monitoring Exposure to Radiation rad = "radiation absorbed dose": energy absorbed per gram of material. rem = radiation equivalent man": accounts for varying effects of, and radiation. rem = rad x quality factor Applications of Nuclear Chemistry Medical Applications PET Scans Radiotracers Cancer therapy Fundamental Applications Reaction mechanisms Chemical structures Chemical analysis Neutron activation analysis: 6
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