Transcript Radioactive Decay What are the 3 types of decay? 1.Alpha – Release of Helium nucleus 2.Beta – Release of an electron 3.Gamma – Release of an energy.

Radioactive Decay
What are the 3 types of decay?
1.Alpha
– Release of Helium nucleus
2.Beta
– Release of an electron
3.Gamma
– Release of an energy burst
PLAY DON’T CHA VIDEO
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Alpha Decay:
• When an unstable nucleus releases a
Helium nucleus, which is called an
ALPHA PARTICLE = HELIUM NUCLEUS
α
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PLAY ALPHA CLIP
4
2
He
ALPHA DECAY
238
92
U 
4
2
He + ?
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ALPHA DECAY
238
92
U 
4
2
He +
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234
90
Th
Alpha Decay:
4
2
234
238
990
2
T
Uh
He
ALPHA DECAY
238
234
990
2
TUh
238
234
990
2
TUh
238
234
990
2
TUh
238
234
990
2
TUh
238
234
990
2
TUh
238
234
990
2
TUh
ALPHA DECAY
238
234
990
2
WATCH!
TUh
RUN ALPHA
DECAY SIMULATOR
Alpha Decay:
• Example Equation.
211
84
Po 
211
84
Po
215
86
4
2
He + ?
Po
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207
82
Pb
Alpha Decay:
• Example Equation.
236
92
U 
240
94
U
4
2
232
90
He + ?
Th
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240
94
Pu
Alpha Decay:
• Complete the equation.
226
88
Ra  He + ?
228
92
4
2
U
230
90
Th
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222
86
Rn
Alpha Decay:
• Complete the equation.
?  He +
4
2
233
91
Pa
241
95
237
93
Am
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Np
233
91
U
Alpha Decay:
• Complete the equation.
?
244
94
Pu
4
2
He +
244
96
Cm
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240
92
U
238
94
Pu
Beta Decay:
• When an unstable nucleus turns a neutron
into a proton and releases an electron.
BETA PARTICLE = ELECTRON
β
n
p
PLAY BETA CLIP
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0
1
e
BETA DECAY
n
p
14
6
C 
0
-1
e+?
BETA DECAY
n
14
6
p
C 
0
-1
e+
14
7
N
Protons and neutrons are made of
smaller particles called QUARKS
Beta Decay:
0
1
e
BETA DECAY
14
14
76
14
14
76
N
C
N
C
14
14
76
14
14
76
N
C
14
14
76
N
C
N
C
14
14
76
N
C
BETA DECAY
14
14
76
WATCH!
e
C
N
RUN BETA DECAY SIMULATOR
Beta Decay:
p
n
• Example Equation.
3
1
4
2
H 
He
0
-1
0
2
e+ ?
He
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3
2
He
Beta Decay:
p
n
• Example Equation.
232
90
231
90
Th 
Th
232
92
0
-1
e+ ?
U
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232
91
Pa
Beta Decay:
p
n
• Example Equation.
140
58
Ce 
140
59
139
57
Pr
0
-1
e+?
Ce
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140
59
La
Beta Decay:
p
n
• Example Equation.
?
150
61
0
-1
Sm
e+
150
61
150
62
Pm
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Sm
150
63
Eu
Beta Decay:
p
n
• Example Equation.
?
164
67
0
-1
Ho
e+
164
69
164
68
Tm
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Er
164
67
Er
Gamma Rays:
Gamma Radiation:
• When an unstable nucleus releases a
burst of high energy wavelengths.
GAMMA = ENERGY
γ
PLAY GAMMA CLIP
PLAY THE HULK CLIP
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GAMMA RAY VIDEO
GAMMA RAYS
241
95
Am 
4
2
He +
237
93
γ
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Np +
0
0
γ
Gamma Rays:
• Example Equation.
226
88
222
86
Ra 
Rn
226
88
0
0
γ+?
Ra
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227
89
Ac
LESSON SUMMARY
 Identify
the Main Topic. Use my analogies.
The topic we learned in chemistry today
was __________, which is caused by…
 Give
an example of the topic.
For instance, _____ is a good example of
the topic because…
 Explain
additional details of your example.
Furthermore, your example shows the topic
because it demonstrates…
Penetration Power
Power of Radioactive Decay
1.Alpha
– Gets blocked by paper
2.Beta
– Gets blocked by wood or
aluminum
3.Gamma
– Gets blocked by lead or thick
concrete
PLAY DON’T CHA VIDEO
PLAY RADIATION PENETRATION CLIP
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PAPER
WOOD
OR
ALUMINUM
LEAD
OR
CONCRETE
PAPER
WOOD
OR
ALUMINUM
LEAD
OR
CONCRETE
BODY ARMOR
1: NONE
2: PAPER
3: WOOD
4: ALUMINUM
5: LEAD
6: CONCRETE
SWORD
1: ALPHA
2: ALPHA
3: BETA
4: BETA
5: GAMMA
6: GAMMA