Table 5e 6 omtarison of fallout (me/mi=/mo ) in rain water to total fallout! ) Air Force ___Rain Water _ Sampling Total Month New York Roof Fots Average Activity Total sro New Haven Dust Fall F activity Sr2° Pittsburgh Rainfall Total f activity sr2° sr March 20 1.3 L6 109 =— == 1.4 April LS 1.3 84 0.8 63 203 1.0 May 21 1.2 71 160 he 0.6 105 June 17 0.8 27 0.8 28 O06 lel July 27 1.5 77 0.6 =- woe 0.6 The best comparison between rain water data and total fallout should be obtained using gummed film data, since the gummed film network covers the same area as the rain water stations and operated over the same sampling period, in figure , Tne positioning of the two sampling networks is shown Because only 14 of the stations are duplicated, geographic extrapolation is employed to obtain values for the rain water sites that are not covered by gummed film stations. Distences of 100, 150, 200 and 500 miles were used as extrapolation radii, but it was found that the distance used made little difference in the final correlation, 150 miles was chosen as the optimum distance because, when circles of this radius were drawn around ths rain water sites, a maximum number of gummed film stations fell within the given areas with a minimum number of circles | overlapping. Wath cats scheme there are 11 results that may be compared in March; 30, in Aprii: 20, in May3 25, in June, end 23 in July. The highest @e Pla ~~ : Se » : x 7 ae, A, ~ “. ee SB BR SS ARES LS SETTER . = al . a ~" ss oe TKR YS i ~ Teo ~ = s “A _ Py res ee . =~ vA Ty! TT DE SSree Pe ee eens . ~ A = 5 , .