User blog comment:Beetee19/The Iditarod Games/@comment-4964864-20121205043800

Here is your next sponsor question: (PopTart...not this one. You might be glad.)

Uranium-235 has a half life of 704 million years. It decays to Thorium-231, with a half life of 25.5 hours. That decays to Protactinium-231, with a half life of 32,800 years, which decays to Actinium-227, with a half life of 21.77 years. This decays to Thorium-227 (18.72 days). This decays to Radium-223 (11.4 days). This decays to Radon-219 (3.96 sec). This decays to Polonium-215 (1.8 milliseconds). This decays to Lead-211 (36.1 minutes). This decays to Bismuth-211 (2.14 minutes). This decays to Polonium-211 (.5 seconds). After this decays you will wind up with a stable isotope, Lead-207. Say you are given 2.35 kilograms of Uranium-235. If it were possible for you to survive until all radioactive decay was completed as well as remain unharmed by any radiation from the alpha and beta particles released by the elements present in this decay series, and you wanted to wait until you had exactly 30.6 grams of lead, then what is the square root of 196?