radiochemistry - the integration of physics and chemistry - the beginnings 1789- klaprothuranium...
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Radiochemistry - The Integration of
Physics and Chemistry - the Beginnings 1789- Klaproth Uranium discovered
1841- Peligot Uranium isolated
1895 - Roentgen X - rays
1896 - Becquerel Radioactivity
1898 - The Curies Radium and Polonium
1899 - Rutherford Alpha & beta particles
1904 - Rutherford & Soddy Theory of radioactivity
1911 - Rutherford Model of the atom
1913 - Bohr Model of the atom Soddy Isotopes of elements
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Radiochemistry - The Integration of Physics and Chemistry - the Continuation
1918 - Aston Identifies isotopes of neon
1919 - Rutherford & Chadwick Artificial elemental transmutation
1932 - Chadwick Neutron Urey Isolates deuterium an isotope of
hydrogen
1934 - Joliot-Curies Artificial radioactivity Fermi ‘Transuranium’ elements Noddack Suggests possibility of fission
1935 - Fermi Neutron moderation Dempster Discovery of U-235
1936 - Bohr Liquid drop model of nucleus
1938 - Hahn & Straussman Chemical verification of fission
1939 - Meitner & Frisch Explanation of Hahn’s results
1941 - Seaborg Plutonium
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XU
Th
Number of protons
Nu
mb
er o
f n
eutr
on
s
α
β
X is a “new” transuranium element
Keeping nuclear transformations in the neighborhood
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Hahn and StraussmanChemical Discovery of Fission
Berlin, December 1938
Neutron source
Uranium compounds
Ra (III)
Ra (III) +Acid
Ra (III)soln
+BaCl2
carriersoln
Ra (III) &Ba2+ soln
Ra (III) &Ba2+ soln
Ra (III)soln
H2CO3
solnSoln &BaCO3(s)Ra(III)CO3
BaCO3(s)Ra(III)CO3
+
HBr+ Ra (III) &
Ba2+ soln
Ra (III) &Ba2+ soln
Fractionalcrystallization Could not separate
Ra(III) from Ba !
n1on1
o
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The Beginning of the Manhattan Project
Albert Einstein and Leo SzilardLong Island, New York
August 1939
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•Established April 1940 as a result of the Frisch-Peirerls Memo
•Functioned under the ministry of Aircraft production
•Final report completed July 1941 was most useful to the U.S.
•Directed by Prof. G. P. Thomson, J.J.’s son
British MAUD Committee
Cambridge Birmingham Oxford Liverpool I.C.I.(fundamental (U-235 bomb) (Separation (fundamental (chemicalnuclear properties) of U-235) nuclear properties) problems)
Cockcrof Haworth Simon Chadwick BaxterBragg Peirels FrischHalban FuchsKowarski
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Seaborg’s diary entry on the discovery of element atomic number 94
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Seaborg’s discovery that element 94 undergoes fission
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Neu
tron
cro
ss s
ecti
ons
fission
non-fissionU-238
U-238
U-235
Pu-239
Neutron energy25 ev 1 Mev(slow) (fast)
Results of Neutron Interactions with Uranium and Plutonium Isotopes
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Possible Routes to Fissionable Materials
Considered by U. S. in 1942
Natural Uranium(99.3% U-238, 0.7% U-235)
•Gaseous Diffusion•Electromagnetic Separation•Centrifugation•Liquid Thermal Diffusion
U-235
•Uranium-graphite reactor•Uranium-heavy water reactor
Pu-239
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Uranium MetallurgyUranium Metallurgy
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Methods Used to Separate U-235
from U-238
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Gaseous DiffusionK-25 Plant
Oak Ridge
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Calutrons at the Y-12 Plant
Oak Ridge
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Y-12 Electromagnetic Separation Plant
Oak Ridge
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Production of weapons grade U-235Oak Ridge, TN - 1944-45
Natural uraniumU-235 (0.7 %)
UF6 (g)
U-235 (0.86%)UF6 (g)
U-235 (7%)UF4 (s)
ProductU-235 (90%)
UF4 (s)
U-235 (15%)UF4 (s)
S-50Thermal Diffusion
K-25Gaseous Diffusion
Y-12Alpha Calutrons
Y-12Beta Calutrons
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Production of Plutonium From Uranium in a
Nuclear Reactor
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Fuel Fabrication
• Prepare fissile material to fuel nuclear reactors.
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Naturally Occurring Uranium
U-235 (0.7%)
U-238 (99.3%)
Hanford Irradiated Fuel
U-235 (<1%) other radioactive isotopes including Pu-239 (<1%)
U-238 (>98%)
4000 grams of irradiated uranium produce approximately 1 gram Pu-239
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Pu Recovery by Bismuth Phosphate Process
• Pu is found in low concentrations (<250 ppm) in reactor products.
• Weapons grade Pu must be chemically pure (< 1 part in 107 parts Pu).
• The Pu recovery for total process was 95% with < 1 part impurity in 107.
Pu(s) + X(s) HNO3 Pu4+(aq) + Xy+(aq)H2SO4
Pu4+(aq) + Xy+(aq) + Bi3+(aq) Pu3(PO)4(s) + Xy+(aq) + BiPO4(s)
Pu3(PO)4(s) + BiPO4(s)HNO3
oxid. agentPu6+(aq) + Bi3+(aq)
Pu6+(aq) + Bi3+(aq)
H3PO4
H3PO4 Pu6+(aq) + BiPO4(s)
Pu6+(aq)H2O2 PuO2
2+(aq) Pu(s)reducingagent
X(s) = fission products or uranium; y+ = oxidation state
Plutonium was redissolved and further purified using LaF2 in place of BiPO4(s)
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Inside Hanford T Plant
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Little Boy - Hiroshima - 0815, August 6, 1945
Size: 10 ft long Weight: 8.900 lbs. (132 lbs >90% U-235)
(~ 2lbs underwent fission)Height of blast: 1900 ft.Yield: 15 - 16 Kt TNTCasualties ~ 100,000 immediate deaths
~ 200,000 total deaths
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Fat Man - Nagasaki - 1102, August 9, 1945
Size: ~ 10.5 ft long, 5ft. DiameterWeight: 10,300 lbs.. (12 lbs.. Pu-239 of which
~ 2 lbs. underwent fission)Height of blast: 1650 ft.Yield: 22 Kt of TNTCasualties: ~70,000 immediate deaths
~140,000 total deaths
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Steps in Producing a Nuclear Weapon
Mining, milling, and refining
Mining, milling, and refining
Isotope separation(enrichment)
Isotope separation(enrichment)
Fuel and target fabrication
Fuel and target fabrication
Reactor operationsReactor operationsChemical
SeparationsChemical
Separations
Componentfabrication
Componentfabrication
TestingTesting
WeaponsoperationsWeapons
operations
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Fuel rod fabrication plant in Yongbyon, North Korea
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Map of DPRK Nuclear Sites
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http://alsos.wlu.edu
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http://www.chemcases.com/2003version/nuclear/index2.htm
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