Calculate the following information about the radioactive isotope of radium, Ra-226. The initial concentration of it in the water is 0.3 femtomolar (0.3 x 10^-15 mol/L).
a. What is the daughter of Ra-226
b. Given the half lives of Ra-226 and it's daughter, calculate the decay constants ?, for each species in days-1
c. What is the initial activity (A) of Ra-226 in the system? How about it's daughter?
d. What do you expect the equilibrium activity of the daughter isotope will be (assume a closed system)? Why?
e. How long will it take for the activity of the daughter isotope to reach 90% of the value as predicted in part d? what is its concentration at this time?