Table 12a (Continued) Collection No, Collection period Volume, cu ft x 1078 Sr*°/108 cu ft, dis/min 85 +6 22.5 + 1.4 709 + 52 T75-P T7T6-P TIi7-P Apr. 18-19, 1955 Apr. 25-26, 1955 May 2-3, 1955 2.27 1.82 1.34 7T78-P May 10—11, 1955 1.54 265 +12 TT9-P May 17-18, 1955 L.37 478 +16 780-P May 24—25, 1955 1.69 755 = 33 S917-P June 16—17, 1955 1.43 710 + 40 918-P Aug. 5-8, 1955 3.0 300 + 20 919-P Aug. 12-16, 1955 4.51 920-P Aug. 19-22, 1955 3.5 12426 921-P 922-P 923-P Aug. 26—29, 1955 Sept. 26-27, 1955 Sept. 29-30, 1955 3.6 1.53 1.69 226 + 16 158 +9 124 +8 49+4 Table 12b—Sr* SURFACE AIR CONCENTRATION, FOREIGN LOCATIONS There is considerable uncertainity in the air volumes of samples collected at Kodiak, Alaska, Port Lyautey, French Morroco, and Yokosuka, Japan, because the flow rate is not directly recorded. For the earliest reports of air filter data for these three locations, the rated flow rate times the total collection period was taken as the collected air volume, Because the flow rate falls off substantially as dust accumulates on the filter, those samples were overestimated in volume and thus the reported air concentration data were too low, It is considered that a better estimate of their air volume is provided by the average Washington, D. C. volumes for equivalent collection periods. On this basis, the relative air concentration data should be considerably im- proved, although their absolute value may be in error by as much as 50 per cent, All the earlier reported air filter data for Kodiak, Port Lyautey, and Yokosuka have been estimated on chis basis, and the new results are presented below, Collection No. Volume, cu ft x 1078 Collection period sr*°/10® cu ft, dis/min Kodiak, Alaska 924-P 926-P 925-P 927-P 928-P May 27—June 3, 1952 dune 5—July t, 1952 June 11—17, 1952 July 8—16, 1952 July 24-29, 1952 ~4.4 ~4.5 ~4.3 ~4,4 ~4,2 ~4.8 ~6.7 ~9.5 ~6.8 ~4,9 929-P 930-P Aug. 29—Sept. 4, 1952 Sept. 18-25, 1952 ~4 2 ~4..2 ~1.1 ~1.1 931-P 932-P 131 Oct, 9-16, 1952 Oct. 23—30, 1952 Nov, 18—23, 1953 ~4,2 ~4 2 ~4 2 205C Feb. 2—15, 1954 ~4.3 205D2 Feb. 15-18, 1954 ~3.6 205E Feb, 18—22, 1954 ~4,0 933-P Mar. 17-22, 1954 ~4 2 ~44 ~61 $35-P May 17—24, 1954 ~4.4 ~4B 936-P June 14—21, 1954 ~44 ~90 937-P July 19—26, 1954 ~4.4 ~31 939-P Sept. 24-26, 1954 ~3.0 ~35 940-P Oct. 15-18, 1954 ~3.6 934-P Apr. 19-26, 1954 40 <1.0 0.7 + 0.2 ~50 ~2T ~2.2 ~10 ~36 ~6.1