Radon gas, 22286Rn, is considered a serious health hazard. It decays by -emission.

(a) What is the daughter nucleus?

(b) Is the daughter nucleus stable or radioactive? If the latter, how does it decay, and what is its half-life? See Figure below

(c) Is the daughter nucleus also a noble gas, or is it chemically reactive?

(d) Suppose 1.4 ng of 22286Rn seeps into a basement. What will be its activity? If the basement is then sealed, what will be the activity 1 month later?

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238 238U LEGEND 234 234. Th 4.5X 10° B decay adecay 230 230 Th 2.5 x 105 yr 226 226 Ra 7.5 x 10 yr 1600 уг. 222 222 Rn 3.8d 218, 218 Po 218 At Rn 3.1 min 1,5s Bi Po 27 min 20 min 214 Pb 214 0.04 s 214 76x10 210, Po 210 TI 210 10 Ph Bi 1.3 min |22 yr15 d 206. TI 138 d 206 8142 min 82 83 Bi 84 Po 85 At TI 86 Rn Pb 87 Fr 88 Ra 89 Ac 90 Th 91 Pa 92