Two radioactive waste products from nuclear reactors are strontium 90 38 Sr (T1 2 5 29 1 yr) and cesium 134 55 Cs (T 1 2 2 06 yr) These two species are present initially in a ratio of N 0,Sr N 0,Cs 7 80 1023 What is the ratio NSr NCs fifteen years later 90 38 Sr...

The number N of radioactive nuclei remaining after a time ...

Two radioactive waste products from nuclear reactors are strontium 90 38 Sr (T1/2 5 29.1 yr) and

Question:

Two radioactive waste products from nuclear reactors are strontium ⁹⁰₃₈Sr (T1/2 5 29.1 yr) and cesium ¹³⁴₅₅Cs (T_1/2 = 2.06 yr). These two species are present initially in a ratio of N_0,Sr /N_0,Cs = 7.80 × 1023. What is the ratio NSr /NCs fifteen years later?