Table 12.2 Some Naturally Occurring Radio- active Nuclides Natural Nuclide t1/2 (y) Abundance 40 19K 1.28 × 10º 0.01% 87 4.8 × 101º 27.8% 37Rb 113, 48 Cd 115In 9 × 1015 12.2% 4.4 × 1014 95.7% 49 128- Te 7.7 × 1024 31.7% 52 130 52 2.7 × 10²1 33.8% 138 57 La 1.1 × 101' 0.09% 144 60 Nd 2.3 × 1015 23.8% 147 Sm 1.1 × 1011 15.0% 62 7 × 1015 148 11.3% 62 Sm
Table 12.2 Some Naturally Occurring Radio- active Nuclides Natural Nuclide t1/2 (y) Abundance 40 19K 1.28 × 10º 0.01% 87 4.8 × 101º 27.8% 37Rb 113, 48 Cd 115In 9 × 1015 12.2% 4.4 × 1014 95.7% 49 128- Te 7.7 × 1024 31.7% 52 130 52 2.7 × 10²1 33.8% 138 57 La 1.1 × 101' 0.09% 144 60 Nd 2.3 × 1015 23.8% 147 Sm 1.1 × 1011 15.0% 62 7 × 1015 148 11.3% 62 Sm
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Question
Note in Table that the half-lives of two abundant isotopes of tellurium are more than 1021 years. (a) What is the decay rate per unit mass of 128Te, which decays by emitting two β-, in units of s-1 . kg-1? (b) How much mass of a natural sample of tellurium would it take to measure a decay rate of 10 β-/s for 128Te?
![Table 12.2 Some Naturally
Occurring Radio-
active Nuclides
Natural
Nuclide
t1/2 (y)
Abundance
40
19K
1.28 × 10º
0.01%
87
4.8 × 101º
27.8%
37Rb
113,
48
Cd
115In
9 × 1015
12.2%
4.4 × 1014
95.7%
49
128-
Te
7.7 × 1024
31.7%
52
130
52
2.7 × 10²1
33.8%
138
57 La
1.1 × 101'
0.09%
144
60
Nd
2.3 × 1015
23.8%
147
Sm
1.1 × 1011
15.0%
62
7 × 1015
148
11.3%
62 Sm](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc0602db8-f39a-4f37-a427-d58d1b0acfe8%2Fe8ed80e4-6ae3-4123-a7c9-440cb40764a0%2Fm1sihp8.png&w=3840&q=75)
Transcribed Image Text:Table 12.2 Some Naturally
Occurring Radio-
active Nuclides
Natural
Nuclide
t1/2 (y)
Abundance
40
19K
1.28 × 10º
0.01%
87
4.8 × 101º
27.8%
37Rb
113,
48
Cd
115In
9 × 1015
12.2%
4.4 × 1014
95.7%
49
128-
Te
7.7 × 1024
31.7%
52
130
52
2.7 × 10²1
33.8%
138
57 La
1.1 × 101'
0.09%
144
60
Nd
2.3 × 1015
23.8%
147
Sm
1.1 × 1011
15.0%
62
7 × 1015
148
11.3%
62 Sm
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