Table 1—Sr’®, Sr, AND Ba”® ACTIVITIES IN FALLOUT IN NEW YORK CITY Month sr*@ sr®* Balto* July 0.34 0.44 0.43 26.0 20.3 13.0 45.5 October November 0.34 0.41 20.9 8.5 20.9 2.43 December 0.62 12.7 3.41 August September aa Average mc/sq mi 60.0 33.1 *Extrapolated from counting date to last day of sampling month. 200 ee ee ee AUG 4957 a SEPT l OCT L NOV COUNTING DATE DEC L a te + Udtree a ee ee ee eee 400 JAN 1958 eee TOTAL PB ACTIVITY, MC/SQ MILE 450 358 Fes eee eee Fig. 2— Comparisonof total 8 activity from three collection units..-, roof pot; @, roof funnel; ©, roof funnel and resin.