Radon gas in the form of 222Rn is a health hazard because it is a gas that occurs as a result of one of the naturally occurring radioactive decay chains. It tends to collect in basements and can be inhaled by humans.
(a) Which decay chain produces this isotope of radon?
(b) Show that 222Rn produces ?ve more disintegrations before a stable isotope is reached.
(c) Choose one of the paths of the decay chain from 222Rn to the stable isotope and sum the half-lives. Approximate the number of days it would take for more than half these decays to occur for a given amount of radon.