SUBJECT: i Radisiog.cal curve y of Downwird toll¢ Contaminatod by BRAVO that ono survey metor could not be properly zoro adjusted. Tho four romining ‘N/PDR-39, still oporated cfficimtly ard scomed to bo in goed working ordor, Qo (1) cach Bockman MX~5, and one (1) cach 1N/224,wes brought along for any low intonsity checks ncecssary, Two (2) cach ca AN/PDR-T1LB, wer on hand to servo as spares in the ovont of operational fadbape: with tho IN None of these instrummts wor) roquircd. 6, p23 3c TBE The average anc maximum gaoma doso ratos oemwiredon tho various islan’'s of cach atoll arc plottcd in Figures 1 through 5. ‘11 masuremnts woro mdo at waist height unless othorwise indicated, Tho maximum readings do not includo moasurcments made with the instrument icxt to a contaminatod surfaco, Dotailod survoys wero mado of all tho inhabitcd localitics, Typical readings aro given in Tables 1 and 2 for tho native villago of Rongolap Island, and the TG 7.4 camp on Mmiwetak Island, In goncral, tho villages and theo camps appeared te havo slightly lowcr avorago doso ratcs than the romaindcr of tho island. This can porhaps bo ascribed to difforcnt gcometry of the contamination and to slightly grcatcr penotration into the leoso gravol in the nativo villagcs.. Tho doso ratos inside the native huts appoarcd to be almost the samo as the dosc ratc outside. Tho dese rato in the middlo of tho military barracks, tonts, and shacks was 1/3 to _/2 that outsido. This roduction is probably largely a geomt effect. The dose rato foll off rapidly on tho beach below the high tide mrk, Thore was no cvidence of rain washing off thc contaminated mtcrial. The foilnag on the windward sidcs of th tslands appoamd te be slightly above avcrago con tamination, TABLE L TYPICAL READINGS IN RONGZLAP VILLAGE — 8 MARCH Location Dosc Rate (ar/nr) Rongeolap Island (avcrag: Conter of village 375 280 Near contral cistern Near southern cistorn Near northern cisterr 300 220 350 TABLA2 TYPICAL READINGS IN CAMP ON =NIWETGK IS. - 10 MARCH ; Location Eniwotak Island (avoragc' Mess hall sutside Dose Yato (mr/nr) 28t 22o Tent, cdg: cf main camp we Sleeping yar :r3 ol, Latrinc Dispensar ’ 200; i. Inside Dosa Rate (mr/hr) _— pele 175 = 160 90