Of the radioactive nuclides in Table 25.1, 

(a) which one has the largest value for the decay constant, λ?

(b) Which one loses 75% of its radioactivity in approximately one month?

(c) Which ones lose more than 99% of their radioactivity in one month?

Table 25.1

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TABLE 25.1 Some Representative Nuclide Half-Lifea Nuclide H 12.33 a 10K 14C 5715 a 130 8.7 x 10-³ s 7Mg 21 h 14.3 d 87.9 d Br 99 Sr 131 ¹3Cs Half-Lives Half-Lifea 1.26 x 10⁰ a 17.6 min 29.1 a 8.021 d 30.2 a Nuclide 214Po 84¹ 222Rn 22 Ra 23 Th 23 U Half-Lifea 1.64 x 10-4 s 3.823 d 1.599 × 10³ a 24.10 d 4.47 × 10° a