Note in Table 12.2 that the half-lives of two abundant isotopes of tellurium are more th...

Note in Table 12.2 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?