Chapter 9 Nuclear Radiation 9.1 Natural Radioactivitychemvision.net/10_Chapter9_Timberlake.pdf ·...
Transcript of Chapter 9 Nuclear Radiation 9.1 Natural Radioactivitychemvision.net/10_Chapter9_Timberlake.pdf ·...
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Chapter 9 Nuclear Radiation
9.1 Natural Radioactivity
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Radioactive Isotopes
A radioactive isotope• has an unstable nucleus.• emits radiation to become more stable.• can be one or more of the isotopes of an element
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Nuclear Radiation
Nuclear radiation• is the radiation emitted by an unstable atom.• takes the form of alpha particles, neutrons, beta
particles, positrons, or gamma rays.
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Types of Radiation
Alpha (α) particle is two protons and two neutrons.
Beta (β) particle is a high-energy electron. 0e-1
Positron (β+) is a positive electron. 0e+1
Gamma ray is high-energy radiation releasedfrom a nucleus. γ
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Radiation Protection
Radiation protection requires • paper and clothing for alpha particles.• a lab coat or gloves for beta particles.• a lead shield or a thick concrete wall for
gamma rays.• limiting the amount of time spent near
a radioactive source.• increasing the distance from the source.
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Shielding for Radiation Protection
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Chapter 9 Nuclear Radiation
9.2Nuclear Reactions
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Alpha Decay
When a radioactive nucleus emits an alpha particle, a newnucleus forms that has
• a mass number that is decreased by 4.
• an atomic number that is decreased by 2.
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In a balanced nuclear equation, the sum of the mass numbers and the sum of the atomic numbers are equal for the nuclei of the reactants and the products.
MASS NUMBERS
Total = 251 = 251251Cf 247Cm + 4He98 96 2
Total = 98 = 98
ATOMIC NUMBERS
Balancing Nuclear Equations
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Changes in Nuclear Particles Due to Radiation
When radiation occurs,• particles are emitted from the nucleus.• mass number may change.• atomic number may change.
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Guide to Balancing a Nuclear Equation
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Equation for Alpha Emission
Write an equation for the alpha decay of Rn-222.STEP 1: Write the incomplete equation
222Rn ?s + 4He86 2
STEP 2: Determine the mass number 222 – 4 = 218STEP 3: Determine the atomic number 86 – 2 = 84STEP 4: Determine the symbol of element 84 = PoSTEP 5: Complete the equation
222Rn 218Po + 4He 86 84 2
84Po
85 At
4He2
86 Rn
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Beta Emission
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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STEP 1: Write an equation for the decay of 42potassium, a beta emitter.
42K new nucleus + 0e19 -1
STEP 2: Mass number : (same) = 42STEP 3: Atomic number: 19 + 1 = 20STEP 4: Symbol of element: 20 = Ca
STEP 5 42K 42Ca + 0e19 20 -1
Writing An Equation for a Beta Emitter
19K
20 Ca
0e-1
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Write the nuclear equation for the beta decay of 60Co.
Learning Check
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60Co 60Ni + 0e27 28 −1
beta particle
Solution
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In positron emission,• a proton is converted to a neutron and a positron.
1 p 1n + 0e1 0 +1
• the mass number of the new nucleus is the same, but the atomic number decreases by 1.
49Mn 49Cr + 0e25 24 +1
Positron Emission
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In gamma radiation,• energy is emitted from an unstable nucleus,
indicated by m following the mass number.• the mass number and the atomic number of the
new nucleus are the same.
99mTc 99Tc + γ43 43
Gamma Radiation
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Summary of Types of Radiation
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Producing Radioactive Isotopes
Radioactive isotopes are produced • when a stable nucleus is converted to a radioactive
nucleus by bombarding it with a small particle.• in a process called transmutation.
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What radioactive isotope is produced when a neutron bombards 59Co?
59Co + 1n ? + 4He27 0 2
Learning Check
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mass numbers60 = 60
59Co + 1n 56Mn + 4H e27 0 25 2
27 = 27atomic numbers
Solution
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Chapter 9 Nuclear Radiation
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9.3 Radiation Measurement
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Radiation Measurement
A Geiger counter• detects beta and gamma radiation.• uses ions produced by radiation to create an
electrical current.
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Radiation Units
Units of radiation include• Curie
- measures activity as the number of atoms that decay in 1 second.
• rad (radiation absorbed dose)- measures the radiation absorbed by the tissues of the body.
• rem (radiation equivalent)- measures the biological damage caused by
different types of radiation.
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Units of Radiation Measurement
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Exposure to Radiation
Exposure to radiation occurs from
• naturally occurring radioisotopes.
• medical and dental procedures.
• air travel, radon, and smoking cigarettes.
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Learning Check
A typical intravenous dose of I-125 for a thyroid diagnostic test is 100 µ Ci. What is this dosage in megabecquerels (MBq)? (3.7 x 1010 Bq = 1 Ci)
1) 3.7 MBq
2) 3.7 x 106 MBq
3) 2.7 x 102 MBq
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Solution
A typical intravenous does of I-125 for a thyroid diagnostic test is 100 µ Ci. What is this dosage in megabecquerels (MBq)? (3.7 x 1010 Bq = 1 Ci)
1) 3.7 MBq
100 µ Ci x 1 Ci x 3.7 x 1010 Bq x 1 MBq =1 x 106 µ Ci 1 Ci 1 x 106 Bq
3.7 MBq
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Chapter 9 Nuclear Radiation
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9.4 Half-Life of a Radioisotope9.5 Medical Applications Using
Radioactivity
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Half-Life
The half-life of a radioisotope is the time for the radiation level to decrease (decay) to one half of the original value.
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Decay Curve
A decay curve shows the decay of radioactive atoms and the remaining radioactive sample.
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Half-Lives of Some Radioisotopes
Radioisotopes• that are naturally occurring tend to have long half-lives.• used in nuclear medicine have short half-lives.
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In one half-life, 40 mg of a radioisotope decays to 20 mg. After two half-lives, 10 mg of radioisotope remain.
40 mg x 1 x 1 = 10 mg2 2
1 half-life 2 half-livesInitial40 mg
20 mg10 mg
Half-Life Calculations
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The half-life of 123I is 13 hr. How much of a 64 mg sample of 123I is left after 26 hours?
1) 32 mg2) 16 mg3) 8 mg
Learning Check
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Solution
Half-life
13 hr 13 hr
2) 16 mg
STEP 1 Given 64 g; 26 h; 13 hr/half-life
STEP 2 Plan 26 hours Number of half-lives
STEP 3 Equalities 1 half-life = 13 h
STEP 4 Set Up Problem
Number of half-lives = 26 h x 1 half-life = 2 half-lives13 h
64 mg 32 mg 16 mg
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Medical Applications
Radioisotopes with short half-lives are used in nuclear medicine because
• they have the same chemistry in the body as the nonradioactiveatoms.
• in the organs of the body, they give off radiation that exposes a photographic plate (scan), giving an image of an organ. Thyroid scan
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Some Radioisotopes Used in Nuclear Medicine
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Learning Check
Which of the following radioisotopes are most likely to be used in nuclear medicine?
1) 40K half-life 1.3 x 109 years2) 42K half-life 12 hours3) 131I half-life 8 days
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Solution
Which of the following radioisotopes are most likely to be used in nuclear medicine?
Radioisotopes with short half-lives are used in nuclear medicine.
2) 42K half-life 12 hours3) 131I half-life 8 days
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Chapter 9 Nuclear Radiation
9.6 Nuclear Fission and Fusion
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In nuclear fission,
• a large nucleus is bombarded with a small particle.
• the nucleus splits into smaller nuclei and several neutrons.
• large amounts of energy are released.
Nuclear Fission
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When a neutron bombards 235U,
• an unstable nucleus of 236U undergoes fission (splits).• smaller nuclei are produced, such as Kr-91 and Ba-142.• neutrons are released to bombard more 235U.
1n + 235U 236U 91Kr + 142Ba + 3 1n +0 92 92 36 56 0
Nuclear Fission
Energy
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Nuclear Fission Diagram
1n + 235U 236U 91Kr + 142Ba + 3 1n + energy 0 92 92 36 56 0
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Learning Check
Supply the missing atomic symbol to complete the equation for the following nuclear fission reaction.
1n + 235U 137Te + ?X + 2 1n + energy0 92 52 ? 0
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Solution
1n + 235U 137Te + 97Zr + 2 1n + energy0 92 52 40 0
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Chain Reaction
A chain reactionoccurs
• when a critical mass of uranium undergoes fission.
• releasing a large amount of heat and energy that produces an atomic explosion.
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Nuclear Power Plants
In nuclear power plants, • fission is used to produce energy.• control rods in the reactor absorb neutrons to
slow and control the chain reactions of fission.
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Nuclear Fusion
Fusion• occurs at extremely high temperatures (100 000 000 °C).• combines small nuclei into larger nuclei.• releases large amounts of energy.• occurs continuously in the sun and stars.
Copyright © 2009 by Pearson Education, Inc.
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Indicate if each of the following describes1) 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 is1) 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