chapter 4: discovering the secrets of the nucleus from a photographic mystery to the atomic bomb ©...
TRANSCRIPT
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Chapter 4: Discovering the Secrets of the Nucleus
From a Photographic Mystery to the Atomic Bomb
© 2003 John Wiley and Sons Publishers
Courtesy Fermilab/Peter Arnold Inc.
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Brain images with 123I-labeled compound
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Figure 4.1
© 2003 John Wiley and Sons Publishers
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Antoine Henri Becquierel.
© 2003 John Wiley and Sons Publishers
Courtesy Culver Pictures, Inc.
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Marie Sklodowska Curie with her daughter, Irene.
© 2003 John Wiley and Sons Publishers
Courtesy The Center for the History of Chemistry
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Radioactive Isotopes
• A radioactive isotope has an unstable nucleus and emits radiation to become more stable.
• Isotopes of elements may be stable or unstable.
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Alpha Decay
• When a radioactive nucleus emits an alpha particle, a new nucleus results.
• The mass number of the new nucleus is 4 less than that of the initial nucleus.
• The atomic number is decreased by 2.
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Equation for Alpha Decay
Write an equation for the alpha decay of Rn-222. 222Rn new nucleus + 4He 86 2
Determine the mass and atomic numbers of the new nucleus.
Mass number: 222 – 4 = 218Atomic number: 86 – 2 = 84Symbol of element 84 = Po
Complete the equation with the new symbol:222Rn 218Po + 4He
86 84 2
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Beta Decay
A beta particle Is an electron
emitted from the nucleus.
Forms when a neutron in the nucleus breaks down.1n 0e + 1H0 -1 1
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Figure 4.5: Radioactive decay of tritium.
© 2003 John Wiley and Sons Publishers
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Figure 4.6: Radioactive decay of carbon-14.
© 2003 John Wiley and Sons Publishers
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Potassium - 42 is a beta emitter.42K new nucleus + 0e19 -1
The atomic number of the new nucleus increases by 1.
Mass number : (same) = 42Atomic number: 19 + 1 = 20Symbol of element 20 = Ca
The nuclear equation is42K 42Ca + 0e19 20 -1
Writing An Equation for a Beta Emitter
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Ernest Rutherford discovered α rays and β rays.
© 2003 John Wiley and Sons Publishers
Courtesy C.E. Wynn-Williams
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Write the nuclear equation for the beta decay of Co-60.
60Co 27
Learning Check
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Write the nuclear equation for the beta decay of Co-60.
60Co 60Ni + 0e 27 28 1
beta particle
Solution
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• Gamma radiation is energy emitted from an unstable nucleus indicated by m.
• In a nuclear equation for gamma emission, the mass number and the atomic number are the same.
99mTc 99Tc + 43 43
Gamma Radiation
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Summary of Radiation
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Producing Radioactive Isotopes
• A nucleus is converted to a radioactive nucleus by bombarding it with a small particle.
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What radioactive isotope is produced when a neutron bombards cobalt-59?
59Co + 1n ???? + 4He 27 0 2
Learning Check
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What radioactive isotope is produced when a neutron bombards cobalt-59?
mass numbers
= 60 = 6059Co + 1n 56Mn + 4H e
27 0 25 2
= 27 = 27atomic numbers
Solution
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Figure 4.2: The penetrating power of radiation.
© 2003 John Wiley and Sons Publishers
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Figure 4.3: Notation showing atomic number, mass number, and charge.
© 2003 John Wiley and Sons Publishers
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Gamma ray analysis of a fitting for a medical device shows it to be free of flaws.
© 2003 John Wiley and Sons Publishers
Courtesy Amersham Technology
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Figure 4.4: The components of α rays, β rays, and γ rays.
© 2003 John Wiley and Sons Publishers
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Figure 4.7: The sequence of radioactive decay from 238-92U to 206-82Pb.
© 2003 John Wiley and Sons Publishers
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Figure 4.8: A typical fission reaction of U-235.
© 2003 John Wiley and Sons Publishers
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Nuclear Fission
• When a neutron bombards U-235, an unstable nucleus of U-236 undergoes fission (splits) to form smaller nuclei such as Kr-91 and Ba-142.
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Chain Reaction
A chain reaction occurs when a critical mass of uranium undergoes fission so rapidly that the release of a large amount of heat and energy results in an atomic explosion.
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Lise Meitner interpreted Otto Hahn’s experimental observations as confirmation that he had split a uranium nucleus.
© 2003 John Wiley and Sons Publishers
Courtesy Bibliothek Und Archiv zur Geschichte der Max-Planck-Gesellschaft, Berlin
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Figure 4.10: Enrichment by gaseous diffusion.
© 2003 John Wiley and Sons Publishers
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Uranium-235, a source of nuclear power.
© 2003 John Wiley and Sons Publishers
Courtesy US Department of Energy
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Figure 4.11: The operation of fission bombs.
© 2003 John Wiley and Sons Publishers
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The world’s first atomic explosion, July 16, 1945 at Alamogordo, New Mexico.
© 2003 John Wiley and Sons Publishers
Courtesy Scott Camazine/Photo Researchers
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J. Robert Oppenheimer and Leslie Groves at the remains of the tower used in the test of the first atomic bomb.
© 2003 John Wiley and Sons Publishers
Courtesy Bettmann/Corbis Images
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Remains of a building after the explosion of the uranium bomb at Hiroshima, August 6, 1945.
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Courtesy Shigeo Hayashi
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A flare ejected from the surface of the sun.
© 2003 John Wiley and Sons Publishers
Courtesy NASA
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• Fusion involves the combination of small nuclei to form a larger nucleus.
Nuclear Fusion
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Indicate if each of the following is
1) nuclear fission or 2) nuclear fusion
___ A. A nucleus splits.
___ B. Large amounts of energy are released.
___ C. Small nuclei form larger nuclei.
___ D. Hydrogen nuclei react.
___ E. Several neutrons are released.
Learning Check
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Indicate if each of the following is
1) nuclear fission or 2) nuclear fusion
1 A. A nucleus splits.
1, 2 B. Large amounts of energy are released.
2 C. Small nuclei form larger nuclei.
2 D. Hydrogen nuclei react.
1 E. Several neutrons are released.
Solution
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Albert Einstein, he discovered the equation that relates mass and energy.
© 2003 John Wiley and Sons Publishers
Courtesy AP/Wide World Photos
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Nuclear Power and Its Wastes
Divan Fard
This Way to Sustainability V Conference at California State University, Chico
November 5-8, 2009
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Acknowledgement
• Roy Gephart; Jim Amonette, Elsa Rodriguez, Jose Marquez (Pacific Northwest National Laboratory Richland, Washington USA)
• Department of Energy• AAAS• NRC• IAEA• Institute for Energy and Environmental Research• American Nuclear Society• Green Peace• Physicians for Social Responsibility
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Dr. Helen Caldicott’s message :
• “Every male in the Northern Hemisphere has a tiny load of plutonium in his testicles from nuclear (weapons) testing days,” Caldicott said, as men in the audience squirmed.March 24, 2011 8:45 p.m.
• http://www.metronews.ca/ottawa/business/article/813044--new-reactors-mean-more-cancer-critic
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Wind, water and solar technologies can provide 100% of the world’s energy, eliminating all fossil fuels.
Scientific American November 2009Mark Z. Jacobson, Mark A. Delucchi
http://www.scientificamerican.com/article.cfm?id=a-path-to-sustainable-energy-by-2030
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Save 2.5 million to 3 million lives a year Halt global warming, Reduce air and water pollution Develop secure, reliable energy sources
Nearly all with existing technology and at costs comparable with
what we spend on energy today http://www.sciencedaily.com/releases/2011/01/110126091443.htm
ScienceDaily (Jan. 27, 2011)why wouldn't you do it?
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Key Concepts
• The authors’ plan calls for 3.8 million large wind turbines, 90,000 solar plants, and numerous geothermal, tidal and rooftop solar energy panels.
• The cost of generating and transmitting power would be less than the projected cost per kilowatt-hour for fossil fuel and nuclear power.
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Nuclear Industry
• Global warming is a reality and fast action is needed.
• Nuclear industry sees opportunity to promote itself .
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One pound of Uranium produces one million times more energy than one pound of coal.
Claimed Economic Advantages
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Emissions Free
• Nuclear energy annually preventsmillions tons of sulfur
millions tons of nitrogen oxide
millions metric tons of carbon
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Nuclear Fission
1934-Otto Hahn discover fission1938– Scientists study Uranium nucleus
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History of nuclear power1934-Otto Hahn discover fission
1938– Scientists study Uranium nucleus
1941 – Manhattan Project begins
1942 – Controlled nuclear chain reaction
discovere
1945 – U.S. uses two atomic bombs on Japan
1949 – Soviets develop atomic bomb
1952 – U.S. tests hydrogen bomb
1955 – First U.S. nuclear submarine
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The legacy of Hiroshima
• August 6, 1945: city of Hiroshima the victim of the 1st nuclear weapon 140,000 killed.
• August 9, 1945: Nagasaki the victim of the 2nd
nuclear weapon; 75,000 killed.
• Massive, systematic attacks on civilian populations becomes permissible means of waging war .
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Concept of Half-Life
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Decay Series
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Types of Emissions
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Units of Radioactivity
• Curie (Ci) = 3.7X1010 disintegration /Second
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Fuel rods are usually 4m long and 15cm in diameter
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Nuclear Fuel Cycle
• Uranium mining and milling
• Conversion and enrichment
• Fuel rod fabrication
• POWER REACTOR
• Reprocessing, or
• Radioactive waste disposal
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Uranium enrichmentUranium ore is 0.7 %U-235
– Fuel Rod: U-235 3%– Weapons grade: U-235 90%Enrichment needs CFC-114
• CFC-114 is 10,000-20,000 times heat trapping than CO2
The uranium enrichment plant in Paducah, Ky., and its sister facility in Ohio :have been by far thecountry's largest industrial emitters of a chemical that eats the Earth's protective ozone layer.
• More than 800,000 pounds of CFC-114 emitted in to atmosphere, in 1999. -- as another example of the hidden costs of nuclear power.
CFC-114: 1,2-dichlorotetrafluoroethane
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Types of Radioactive Waste• Very low-level waste (VLLW): Radioactive waste that can be
safely disposed of with ordinary refuse
• Low-level waste (LLW): Trash from routine operations, It does not usually require special handling, unless contaminated with alpha emitters.
• Intermediate (medium) level waste (ILW): Radioactive waste which has little heat output. These wastes usually require remote handling
• High-level waste (HLW): Comprise either spent fuel or the highly active wastes resulting from the first stage of fuel reprocessing. A high degree of isolation from the biosphere, is required
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Composition of the Spent Fuel
• The spent nuclear fuel contains about 93% uranium (mostly U-238)
• about 1% plutonium
• less than 1% minor actinides (neptunium, americium, and curium)
• 5% fission products
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Global Nuclear Wastes
• Typical reactor will generate 20 to 30 tons of high-level nuclear waste annually
• The global volume of spent fuel is ,290,000 tons , and is
growing by approximately 10,000 tons annually.
• Despite billion of dollars of investment in various disposal options, the nuclear industry and governments have failed to come up with a feasible and sustainable solution.
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Radioactivity of plutonium
• Half life of plutonium (Pu-239) is 24000 years
• Life span of at least 240,000 years• Neanderthal Man died out
30,000 years ago
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U-238 decay chain (main branch)
• Uranium-238 (half-life: 4.46 billion years) alpha decay ==>
• Thorium-234 (half-life: 24.1 days) beta decay ==>• Protactinium-234m half-life: 1.17 minutes) beta decay ==>• Uranium-234 (half-life: 245,000 years) alpha decay ==>• Thorium-230 (half-life: 75,400 years) alpha decay ==>• Radium-226 (half-life: 1,600 years) alpha decay• ==>• Radon-222 (half-life: 3.82 days) ==> followed by radon
decay products (polonium, bismuth, lead isotopes)
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Thorium-232
• Thorium-232 is, like U-238, has its own decay chain
• Dangerous decay products build up relatively quickly in Th-232
• They are thorium-228, actinium-228 (a beta-emitter), radium-228, and radium-224
• Radium-224 gives off radon-220 (which is similar to radon-222)
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Repository capacity
• Three isotopes, which are linked through a decay process (Pu241, Am241, and Np237), are the major contributors to the estimated dose for releases from the repository, typically occurring between 100,000 and 1 million years, and also to the long-term heat generation that limits the amount of waste that can be placed in the repository
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Nuclear Waste Generation, Pollution and
Remediation at the Hanford Nuclear
Reservation Divan Fard, Jim Amonette,
Elsa Rodriguez, Jose Marquez and Roy Gephart
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Hanford Today:Waste and Nuclear Materials
Volume/gal Curies Chemicals
Tank Waste( 179) 54 million 200 million220,000 MT
Solid Waste 190, million 6 million65,000 MT
Soil and 293 billion 1 million 100,000 to 300,000 MT
Groundwater
Facilities 1300 million 10 million ----
Nuclear Material *186,000 200 million ----
*2.5 million times the Nagasaki bomb
Groundwater
Waste tanks, ranging in size from 55000 to 1100000 gallons. Only 13 pounds of plutonium were used to destroy Nagasaki.
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Drinking water mortality risks in millionth per Pico curie intake (Ref. value: Pu-239 = 2.85)
• U-238 decay chain (main risks)
• U-238: 1.13• U-234: 1.24• Th-230: 1.67• Ra-226: 7.17
• Th-232 decay chain (main risks)
• Th-232: 1.87• Th-228: 1.82• Ra-228: 20.0• Ra-224: 2.74
Pico:10−12 or 0.000000000001
www.ieer.org/comments/cotter.ppt
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Solid Waste
• 196 million gal of low-level and transuranic waste
• 6 million curies (1998)
• 360 kg of plutonium
• 580 MT of uranium
Early Years Later Years
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Radio nuclide Releases to the Atmosphere
32M curies released•12M curies from
reactors•20M curies from reprocessing plants
Key Radionuclides Contributing to Dose (curies)
Year I-131 Ru-103/-106 Ce-144 Sr-90Pu-239
1944-1949 697,000 290 1740 30 2
1950-1959 43,000 1130 630 10 <1
1960-1969 460 130 1350 25 <1
1970-1972 <1 1 50 2 <199% of dose from I-
1311% of dose from these radionuclides
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History of Hanford Tank Waste530 Million gal
High-Level Waste Generated (1944-1988)
Reprocessed239,000 m3
Disposed to Ground*
490,500 m3
Leaked to Ground 3800 m3
Evaporated 1.05 million
m3
53 million galRemaining in Tanks
(2000)*after radionuclide scavenging or cascading
Started1956
Started1945
Started1956
Started1951
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Ponds1944-1990s
Ponds, 1944-1990s
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French Drains1944-1980s
French Drains1944-1980s
Reverse Wells, 1945 – 1955, (one to 1980)
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Specific Retention Trenches 1944-1973
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Cribs, 1944-1990s
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Radioactive contaminants include: • iodine-129, strontium-90, technetium-99,
tritium, and uranium. Non-radioactive contaminants, chromium and chlorinated solvents.
Remediation Techniques:• Commonly sought Pump-and-treat method;
Savannah river site• In situ remediation
Contaminants of Hanford Nuclear reservation groundwater:
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History of U.S. Nuclear Waste Policy
• 1956: National Academy of Sciences concludes that a deep geologic repository is the best permanent solution for disposal of
high-level nuclear wastes (HLW)
• 1977: Reprocessing of commercial spent nuclear fuel (SNF) is prohibited under President Carter
• 1982: Congress passes Nuclear Waste Policy Act (NWPA)– Made DOE responsible for the permanent disposal of U.S.’s SNF and HLW
– Created Office of Civilian Radioactive Waste Management in DOE
– Set up program to begin investigation of sites as potential geologic repositories and established site recommendation/approval process
– Established Nuclear Waste Fund, and directed DOE to begin accepting commercial spent fuel for disposal in 1998 in exchange for utilities’ payment of fees into the fund
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24 years
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Why Yucca Mountain?
Yucca mountain Yucca mountain
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Repository Reference Design Concept
Repository Concept
N
Waste Handling Building
Waste TreatmentBuilding
TransporterMaintenance
Building
Surface Layout Waste Receiving
North Portal Entrance
Alcove #1
Enhanced Characterization Repository Block
Drift
Subsurface LayoutWaste Emplacement
To accommodate 70,000 metric tons, the proposed repository would include
approximately 36 miles of tunnels which would hold approximately
10,000 waste packages.
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Repository Program Schedule
Activity Date
Submited Yucca Mt. License Application to NRC
Feb 19, 2009
Begin Nevada rail construction (Caliente route,”) http://www.rgj.com/article/20090411/NEWS/904110320/1321
Oct. 2009
NRC authorizes repository construction
Sept. 2011
Complete initial rail accessJun. 2014
Complete construction for initial repository operations
Mar. 2016
Begin receipt of Nuclear WastesMar. 2017
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How will Spend Nuclear Wastes and High Level Waste be Transported?
• Per 2004 Record of Decision, DOE will transport SNF and HLW mostly by rail, with additional limited truck and barge shipments
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Drinking water mortality risks in millionth per Pico curie intake (Ref. value: Pu-239 = 2.85)
• U-238 decay chain (main risks)
• U-238: 1.13• U-234: 1.24• Th-230: 1.67• Ra-226: 7.17
• Th-232 decay chain (main risks)
• Th-232: 1.87• Th-228: 1.82• Ra-228: 20.0• Ra-224: 2.74
Pico:10−12 or 0.000000000001
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3.5 million sick,
one/third of them children
Chernobyl
4,000 deaths in 20 years
4056 ( 03/24/11)
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400 million people exposed in 20 countries
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Health effects radiation exposure:
-increased likelihood of cancer
-birth defects including long limbs,
-braindamage
-conjoined stillborn twins
-reduced immunity
-genetic damage
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Melt Down, Three-Mile Island PA 1979
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Health around TMI
• In 1979, hundreds of people reported nausea, vomiting, hair loss, and skin rashes. Many pets were reported dead or showed signs of radiation
• Lung cancer, and leukemia rates increased 2 to 10 times in areas within 10 miles downwind
• Farmers received severe monetary losses due to deformities in livestock and crops after the disaster that are still occurring today.
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Plants near TMI
-lack of chlorophyll
-deformed leaf patterns
-thick, flat, hollow stems
-missing reproductive parts
-abnormally large leaf sizeTMI dandelion leaf at right
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Animals Nearby TMI• Many insects disappeared
for years.
– Bumble bees, carpenter bees, certain type caterpillars, or daddy-long-leg spiders
– Pheasants and hop toads have disappeared.
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Other reactor accidents (besides TMI and Chernobyl)
• 1952 Chalk River, Ontario– Partial core meltdown
• 1957 Windscale, England– Graphite reactor fire contaminates 200 square miles.
• 1975 Browns Ferry, Alabama– Plant caught fire
• 1976 Lubmin, East Germany– Near meltdown of reactor core .
• 1999 Tokaimura, Japan– Nuclear fuel plant spewed high levels of radioactive gas
– March 11, 2011 Fukushima Daiichi Nuclear Accident
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Sustainable Energy Alternatives
• Bioenergy: biomass, such as plant matter and animal waste, can yield power, heat, steam, and fuel.
• Geothermal: renewable heat energy can be harnessed from deep within the earth.
• Wind: turbines turning in the air convert kinetic energy in the wind into electricity.
• Solar: the sun’s energy can be captured and used to produce heat and electricity.
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• Hydrogen: if produced by renewable sources, it can power fuel cells to convert chemical energy directly into electricity, with useful heat and water as the only byproducts.
• Tidal: using the movement of the ocean to power turbines and generate electricity.
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End
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© 2003 John Wiley and Sons Publishers
What incorrect assumption did Becquerel make in beginning his investigation of uranium, sunlight, and photographic paper? What correct conclusion did he reach when he found spots on paper that was in contact with uranium exposed to the sun? What incorrect conclusion did he reach when he made this observation? What result caused him to turn the entire project over to Marie Sklodowska Curie for further investigation?
QUESTION
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© 2003 John Wiley and Sons Publishers
Which component of radioactivity would be stopped by this single page? Which two components would be stopped (completely or almost completely) by this entire book? Which component would pass, almost undiminished, through both this single page and this entire book?
QUESTION
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© 2003 John Wiley and Sons Publishers
How does an atom’s atomic number change when its nucleus loses a(n): (a) α particle, (b) β particle, (c) ray? How does that atom’s mass number change with the loss of each of these?
QUESTION
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© 2003 John Wiley and Sons Publishers
In what ways does the structure of an atom of antihydrogen differ from the structure of an atom of hydrogen? In what ways are the two atoms similar?
QUESTION
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© 2003 John Wiley and Sons Publishers
When an atom of uranium –235 is bombarded with neutrons, one of the many fission reactions it can undergo produces barium and an additional element (as well as energy and additional neutrons) but no α particles or β particles. With this in mind, and with reference to the periodic table, name the additional element produced in this particular mode of fission.
QUESTION
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© 2003 John Wiley and Sons Publishers
(a) What is the advantage to using U-235 rather than U-238 as the fissionable material in building a fission bomb? (b) What is the disadvantage to using U-235 rather than U-238 as the fissionable material?
QUESTION
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© 2003 John Wiley and Sons Publishers
How was a critical mass achieved in the detonation of the U-235 bomb? In the detonation of the Pu-239 bomb?
QUESTION
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© 2003 John Wiley and Sons Publishers
Using the Law of Conservation of Mass and the Law of Conservation of Energy, show why nuclear fission might not be viewed as a chemical reaction.
QUESTION
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© 2003 John Wiley and Sons Publishers
Calculate the mass defect of an atom of Pu-239. The measured mass of an atom of Pu-239 is 239.05 amu.
QUESTION
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© 2003 John Wiley and Sons Publishers
Table 4.2 shows that the efficient burning of 1g of gasoline could keep a 100-watt light bulb burning for 8 minutes. How long would the energy obtained by the complete conversion of the gram of gasoline directly into energy keep the bulb lit?
QUESTION