Name:
HW#7: Nuclear Radiation
1.
An electrically charged atom is called an
2.
Complete these beta reactions, which occur in a breeder reactor:
a.
3.
4.
5.
U 
239
92
0
-1
e + ?
b.
.
Np 
239
93
0
-1
e+ ?
Complete the following fission/fusion reactions:
a.
1
0
b.
2
1
n +
235
92
U 
H +
3
1
Xe +
143
54
Sr + ? 01n
90
38
H  24He + ?
Complete these nuclear reactions:
a.
230
90
c.
14
6
Th 
C 
Ra + ?
226
88
N + ?
14
7
b.
218
85
d.
80
35
At  24He + ?
Br 
Kr + ?
80
36
An archeologist extracts a sample of carbon from an ancient ax handle
and finds that it emits an average of 10 beta emissions per minute.
The same mass of carbon from a living tree emits 40 betas per
minute. Knowing that the half-life of carbon-14 is 5730 years, the age
of the ax handle is about:
a.
b.
c.
d.
2865 years
5730 years
11460 years
17190 years