NAME ________________________
PART I.
A. Alpha Decay
1)
238
92
 He
4
2
or 42  2
2
 4.4 *10
T
9
yr
.5
U 146 0
   42 He 2  _______
 22 sec
T
249
98
T

0
1
1 or 0-1e-1
 15 hr
T
3)
160
64
5)
14
6
Fm153
4)
253
100
10
1.4 *10 yr
T
.5
Th 144 0
   42 He 2  _______
234
90
T
 3.7 days
.5
Fm153 0
  42 He 2  _______
 351 yr
.5
Na 13 0
 
24
11
253
100
2)
.5
Cf151 0

 2 42 He 2  _______
B. Beta Decay
1)
NUCLEAR DECAY EQUATIONS

.5
  42 He 2 
3) _______ 0
5)
Set #7
T

  _______
0
1
 72 d
.5
Gd 96 0
 2 01   _______
T
 5730 yr
.5
C 8 0
 

C. Electron Capture
4)
 5.3 yr
T
.5
Co 33 0


197
77
 19 hr
T
.5
Ir120 0

0
1
e  _______
0
1
e  _______
  _______

 53 d
T
60
27
0
1
0 1
1
e
2)
.5
Be 3  0-1e 0
 _______
1)
7
4
3)
168
71
.5
Lu 97  0-1e 0
  _______
5)
138
60
.5
Nd 78  0-1e 0
 _______
T
 7.1 min
T
 22 min
T
 1.3 hr
0
.5


2) _______  -1e 0
4)
151
64
T
164
69
Tm 95
120 d
.5
Gd 87  ________ 0
 
151
62
Sm 89
PART II
1. Write the symbol for:
a. an alpha particle (2 different ways)
b. a beta particle (2 different ways)
c. gamma ray
2. Platinum-177 undergoes alpha decay. What will be formed?
3. Bismuth-201 is unstable and emits an alpha particle. Write an equation that shows this.
4. What would form if Sn-127 underwent beta decay?
5. Write an equation showing the beta decay of Mn-57.
6. Iron-55 has a half-life of 6.0 min. How much of a 3.88 mg sample would be left after 24 min?
7. Nitrogen-17 has a half-life of 4.16 s. If a sample has an activity of 0.226 c at some time, how long
must it sit to have an activity of 0.0565 c?