The most significant source of natural radiation

Chapter 20, Problem 20.84

(choose chapter or problem)

The most significant source of natural radiation is radon-222. 222Rn, a decay product of 238U, is continuously generated in the earths crust allowing gaseous Rn to seep into the basements of buildings. Because 222Rn is an a-particle producer with a relatively short half-life of 3.82 days, it can cause biological damage when inhaled. a. How many a particles and b particles are produced when 238U decays to 222Rn? What nuclei is produced when 222Rn decays? b. Radon is a noble gas so one would expect it to pass through the body quickly. Why is there a concern over inhaling 222Rn? c. Another problem associated with 222Rn is that the decay of 222Rn produces a more potent a-particle producer (t1y2 5 3.11 min) that is a solid. What is the identity of the solid? Give the balanced equation of this species decaying by a-particle production. Why is the solid a more potent a-particle producer? d. The U.S. Environmental Protection Agency (EPA) recommends that 222Rn levels not exceed 4 pCi per liter of air (1 Ci 5 1 curie 5 3.7 3 1010 decay events per second; 1 pCi 5 1 3 10212 Ci). Convert 4.0 pCi per liter of air into concentration units of 222Rn atoms per liter of air and mole of 222Rn per liter of air