Name: _________ANSWER KEY ______________________ Date: ______________________________ Period: ________
Identify the following examples as alpha, beta, or gamma decay.
1.
233 U 
92
4 He +
2
229 Th _alpha_
90
4.
202
81
Tl  202
81
Tl + 0
0 ɣ gamma
2.
99 Tc 
43
0 e +
−1
99 Ru _beta__
44
5.
125
53
I  0
0
ɣ + 125
53
I gamma
3.
175
78
Pt  171
76
Os + 4
2
He _alpha_
6.
82
35
Br  82
36
Kr + 0
−1 e _beta__
Alpha Decay: Write the alpha decay equations for the following nuclides.
Example:
208
84
Po  4
2
He + 204
82
Pb
7.
256
103
Lr  4
2
He + 252
101
Md
9.
185
79
Au  4
2
He + 181
77
Ir
8.
231
91
Pa  4 He +
2
227
89
Ac
10.
Beta Decay: Write the beta decay equations for the following nuclides.
211
87
Fr  4
2
He + 207
85
At
Example:
14
6
C  14
7
N + 0
−1 e
11.
24
11
Na  24
8
O + 0
−1 e
13.
247
95
Am  247
96
Cm + 0
−1 e
12.
201
79
Au  201
80
Hg + 0
−1 e
14.
90
38
Sr  90
39
Y + 0
−1 e
Balancing Decay Reactions: Fill in the blank in each of the following decay reactions with the correct decay particle or decayed nucleus that will balance the reaction, also state whether it is alpha or beta decay
15.
184 W 
74
4 He +
2
180 Hf
72
16.
35
16
S  0
−1 e + 35
17
Cl is an example of is an example of
_alpha_
decay.
_beta__
decay.
17.
210 Pb 
82
4 He +
2
206 Hg
80 is an example of
_alpha_
decay.
18.
211 Bi 
83
4 He +
2
207 Tl
81 is an example of
_alpha_
decay.
19.
14
6
Po  0
−1 e + 14
7
N is an example of
_beta__
decay.
20.
60 W 
27
0
−1 e + 60 Ni
28 is an example of
_beta__
decay.