Radon Strategies Practical Radon Control for Homes by Terry Brennan and Susan Galbraith; Cutter Information Corp.; Arlington, Mass.; 1988; 164 pages; $40. Radon, as we are all becoming aware, is a colorless, odorless gas produced by the natural "decay" of radioactive uranium in the soil. The alpha particles emitted in this decay process are so weak, according to authors Brennan and Galbraith, that they can't even penetrate through a single layer of dead skin from outside the body. However, so-called "daughter" decay products can lodge in the lungs if inhaled, where tissue is so thin that oxygen and carbon dioxide pass through (as indeed they must). Long term exposure to certain radon levels could cause lung cancer. How do you