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Two radioactive waste products from nuclear reactors are strontium 38Sr90 (t1/2 = 29.1 yr) and cesium...

Two radioactive waste products from nuclear reactors are strontium 38Sr90 (t1/2 = 29.1 yr) and cesium 55Cs134 (t1/2 = 2.06 yr). These two species are present initially in a ratio N0, Sr /N0, Cs = 7.80 × 10-3. What is the ratio NSr /NCs 23 years later?

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