1.will not take any after next tuesday 1/13 1.define each of these terms: you may use your notes and...
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1. Will not take any after next Tuesday 1/13
Late Work?
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1. Define each of these terms: You may use your notes and they do not need to be in complete sentences
EnergyHalf-life Law of Conservation of Matter Fusion Fission
2. Which is represented below alpha, beta, or gamma decay?
238 U 238 Nb + 0 e
ABSENT YESTERDAY?Entry Task
92 99 -1
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1. GRAPH HOW WELL YOU DID ON YOUR ENTRY TASK AND WORKSHEET AFTER YESTERDAYS DISCUSSION
UPDATE YOUR GOAL SHEET
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Electromagnetic Spectrum
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Which is more penetrating? Why?
Higher Energy and Frequency
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Alpha decay occurs only in heavier elements of atomic number 52, tellurium, and greater.
Beta & Gamma were seen in all of the elements.
Radioactive decay is seen in all isotopes of all elements of atomic number 83.(Wikipedia)
Nuclei with atomic number > 83 are radioactive
How do you know which type of decay will occur?
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•Nuclear Stability •Half-Life
http://imperfectionists.wordpress.com/
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When do we get alpha decay?
• A nucleus decays because it is unstable. • The daughter nucleus is more stable than
the parent• So you will not have the same element
after the parent material decays
• Decrease of Protons & Neutrons by 2
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Alpha Decay
Uranium Thorium
Alpha Particle
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• What are the products of Carbon going through alpha decay
Turn and talk, document in notebook
• Lets write it out
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When do we get beta decay?• Occurs in a nucleus w/ too many protons
or too many neutrons• When decays also gives off an e- (no
mass, neg. charge) called a beta particle
• The resulting reaction is the same mass, but an increase of one proton• How?
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When do we get beta decay?• Neutrons are composed of 1 e- & 1 proton• Neutron decays to release 1 e- what do you
have left?
One Proton
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Beta Decay
Thorium Protactinium
Beta Particle
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• What are the products of Carbon going through beta decay
Turn and talk, document in notebook
• Lets write it out
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When do we get gamma decay?• a nucleus changes from a higher E state to a
lower E thru the release of EM radiation (photons).
• The # of protons (and neutrons) in the nucleus doesn’t change, so parent and daughter are same element
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•Half-Life
http://imperfectionists.wordpress.com/http://www.physics.isu.edu/radinf/half.htm
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Common Radioactive Isotopes
Isotope Half-Life Radiation Emitted
Carbon-14 5,730 years β, γ
Radon-222 3.8 days α
Uranium-235 7.0 x 108 years α, γ
Uranium-238 4.46 x 109 years α
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Radioactive Half-Life
• After one half life there is 1/2 of original sample left.
• After two half-lives, there will be
1/2 of the 1/2 = 1/4 the original sample.
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Example
You have 100 g of radioactive C-14. The half-life of C-14 is 5730 years.
• How many grams are left after one half-life?
• How many grams are left after two half-lives?
Answer: 50 g
Answer: 25 g