SUBJECT: “ams Radi .ogs.i1 Survey of Downwind ..toli_ Cor. sminated by BR..VO that one survoy meter could not be properly zcro adjustod. The four remining !N/PDR~39, still operated cfficicntly and secmed to be in good working ordcr. Onc (1) cach Beckman MX-5, and one (1) cach AN/PDR-27A was brought alory for any low intensity checks necessary. Two (2) cach calibrated AN/PDR-T1B, wore on hand to scrvo as sparcs in the cvoent of opcrational failuro with the tN/PDR-*” None of thesc instrummts wero requircd, 6, The average and maximum gamma dose ratcs moasurod on the various islance of cach atoll arc plottcd in Figures 1 through 5. All measurements were mde at waist height unlcss otherwise indicatcd, The mximum readings do not includo measurements made with the instrumcnt next to a contaminated surface. Detailed survoys were made of all the inhabitcd localitics, Typical readings are given in Tables 1 and 2 for the nativo villago of Rongclap Island, and the TG 7.4 camp on Miwctak Island. In gcencral, tho villages and the camps appearcd te have slightly lowcr averago dose ratcs than the romaindcr of tho island, This can perhaps be ascribod to different gcomctry of tho contamination and to slightly grcatcr penctration into the leoso gravel in the nativo villages. The dose ratcs inside the nativo huts appcared to be almost the samo as the dose rate outsidc. The dose rate in the middlo of the military barracks, tcnts, and shacks wes 1/3 to 1/2 that outside, This reduction is probably largclyg gcomt effect. The dose rate foll off rapidly on the beach bolow the high tide mrk. There was no cvidence of rain washing off the contaminatcd mtcrial. The foilag on the windward sides of the islands appcarod to be slightly above average con- tamination. BEST AVAI L COPY BLE \< TYPICAL READINGS IN RONGELAP VILLAGE —~ 8 MARCH Location Dosc Rato (ar /nr) Rongclap Island (avcrage) 375 Near central cistern Near southern cistern Near northern cistorn 300 220 350 Center of village 280 TABLE 2 SAN BRUNO YO ERC TYPICAL READINGS IN CAMP ON ENTWETAK IS. - 10 MiRG . Location Outside Dose Inside Dose Rate (mr/hr) (ar/hr) Eniwctak Island (average) 280 ~- Tent, cdge of min camp 270 175 Mess hall Latrine Sleeping quarters Dispensary 220 “" 260 260 220 110 _