11 131-2-16-2011
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Transcript of 11 131-2-16-2011
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Bequerel 1899
Contact print of U
Containing rock
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Becquerel’s experiment
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Radioactivity
• Discovery
• Types of radioactivity
• Measuring radioactivity
• ½ lives• ½ lives
• Effects
• uses
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Ionizing radiation
• Energy enough to knock e- off atoms or
molecules
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waves
Vibration of electrical/magnetic field (perpendicular)
(remember feeling the interaction of the fields with the Tesla
Coil and magnet??)
UVbeads
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Radioactive decay
• Alpha α
235U
Large nuclei –
Usually above Bismuth
All elements after Bi
Are radioactive (unstable)
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Alpha decay examples
• Am 241
• Pu 239
• Ra 222
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Alpha decay examples
• Am 241
• Pu 239
• Ra 222
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Beta decay
• Beta minus decay
• Nucleus loses an electron…..???
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Beta-plus
F-19(PET scans)
Positron + electron� energy
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Gamma decay
99Tc
Gamma camera image
Of container truck
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summary
Pg 327
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Symbols for nuclear “particles”
•0
-1e electron, β−
•0
+1e positron
•4 He, α alpha
00γ gamma
10n neutron
•4
2He, α alpha11p proton
Pg 320
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What pieces are missing – add the atomic numbers and determine the missing piece
Transmutation, fission, fusion, alpha, beta-, beta+, gamma,
electron capture