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Homework Statement What mass of Po-212 (T1/2=0.16sec) is in secular equilibrium with Th-232(T1/2=1.41 x10^10years)? Using A(r)=232.04g.mol-1 for Th-232 and A(r)=211.99g.mol-1 for Po-212 Homework Equations The Attempt at a Solution

The element rubidium consists of two isotopes; the stable Rb-85 and the radioactive Rb-87 (abundance 27.83%). What is the specific activity of natural rubidium chloride? if you use A(r)=85.47 g.mol-1 for Rb-element, A(r)= 86.91 g.mol-1 for Rb-87, and M(r) = 120.92 g.mol-1 for RbCl.

What if the element consists of two isotopes: example Stable Rb-85 and the radioactive Rb-87 with an abundance of 27.83%. How would you calculate the specific activity of natural rubidium chloride. I have figured the g.mol-1 for Rb-85=85.47g.mol-1 and 86.91g.mol-1 for the Rb-87, and M(r)...