Let There Be Equality - Radioactive Decay · Physics Brawl 2013 #FoL.10
Physics · modern-physics
Problem
In the container, there is a mixture of m1=50g of iodide 131I and m2=20g of strontium 90Sr. How long will it take to have the same number of atoms of each element in that container? Half-life of iodide is T1 = 8.02d and its amount of substance is M1 = 131g·mol−1, while the values for strontium are T2 = 28.8y and M2 = 90.0g·mol−1.