Answered: Table 12.2 Some Naturally Occurring… | bartleby

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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

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