NUCLEAR FUEL CYCLE: Nuclear Source Characterization T. Downar Nuclear Engineering Purdue University March, 2005 THE NUCLEAR FUEL CYCLE

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Population Densities. Arithmetic : divide population by square miles = pop/sq. mile Physiological density : divide population by square miles of arable land = pop/food producing capacity

Fission. Neutrons are like neutral protons. Mass is 1% larger No coulomb force Neutron lifetime is long, but eventually decays to a proton. l = 624 s. Neutrons can interact directly with nuclei. Strong nuclear force Neutron capture reactions usually involve gamma ray emission. Neutrons.

Nuclear Fission. Fission discovered by Otto Hahn and Fritz Strassman, Lisa Meitner in 1938Demonstrated neutron irradiation of uranium resulted in products like Ba and LaChemical separation of fission productsFor induced fission, odd NAddition of neutron to form even NPairing energy In 1940 G.

Fission. By Tony Chitty. Fission. Nuclear Fission is the splitting of an atomic nucleus. Atomic bombs and nuclear reactors both perform nuclear fission Atomic bombs split unbalanced nuclei into smaller more stable nuclei.

Fission. Readings: Modern Nuclear Chemistry, Chapter 11; Nuclear and Radiochemistry, Chapter 3 General Overview of Fission Energetics The Probability of Fission Fission Product Distributions Total Kinetic Energy Release Fission Product Mass Distributions

Fission. In some cases, a very heavy nucleus, instead of undergoing alpha decay, will spontaneously split in two. Example: 92 U 238 50 Sn 129 + 42 Mo 106 + 3 0 n 1 + energy

Fission. Splitting a nucleus into smaller fragments Happens with atoms larger than Iron (Fe) Usually far more massive Can release A LOT of energy Think: atomic bomb Nuclear reactors use fission as source of energy. http://www.atomicarchive.com/Fission/Fission1.shtml.