TABLE 6 RaD AND Ra22® CONCENTRATIONS IN RIB BONES OF CHICAGO RESIDENTS RESIDENCE TIME >15 YEARS Sample P 1 2 3 4 5 6 7 8 9 10 il 12 13 : 14 rae Sm ee ARE a PTE | meat ete ne mt Rade (pc/g ash) 014 005 009 025 022 028 O10 021 .020 .008 .009 007 .006 022 . Rab (pc/g ash) .063 .078 084 .096 .134 «138 144 160 .190 195 243 290 308 355 015 +.003 177 +.040 (t 20%) (+ 23%)