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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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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
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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