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~.:>ltal:;mgramsand for dostietryand othertechnicalservicesto the ,,,. Personnele Radsaf’e.Mction8$ with the exceptionof siaff as an additionalduty by pc:soncelof tne varioustask groups. Sine:: severalmanningproblem hevlto be solvedto assemklethe nmessa.ry ~~i“: i a~mented by a smallmmber of Navy and Air Force radsafepermmol~ prcvideda fully qualified~mit for manningof TU6, The unit nuuberti a total of 95 at -peakstrer.::th$of which 8 were Navy personne:and 1~- were Air Force, This numbc:’, a reductionof some 20 over the number
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n-mber of technicalpersonnelexperiencedin tesi operations, roent.gmsper lj-weekpe+od~ with a maximumof five roentgensfor respcnsiki~tyfor the safetyof the area adjacentto in the test and appropriatep:-ecautionsrequiredia insurethe ~afety of urits otherthan JTF SEVE1!in the area witti the purviewOf the EPG, to obtaina completerecxd of radioactivitycausedby the teat to nearbypopulatedareas,to assurethe nativepopulationthat all reasonableradiationsaffeguzmlswere em@oyed$ and to providedata for activityfrom the test3. To carry out this, the Task Force operated
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the initialterrainsur=wyof the shot atc7d*tha first time that fixed-wingaircrdt were utilizedfor this type of survey. Precise radiationreadings were not obtainableusing this method;howeve$r$ recoverythan in the past.
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YUCCAwas detonatedte the northeastof EniwetokAtoll at an the d8Vi08 and its vehlaleuas consideredlnalgnifkant~ None of our
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f TEST SMVICES UNIT, PRUVISIGNAL Free Air surface Temperature STATE OF THE SEA:
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1. CAcm wes detonatedat 0615M,6 ~ 1958, at the surfaceon the north end of Yvonne Island$EniwetokAtil.1.Tha uloudrose to 19$000feet Radar trackingwa5 employedwhile th~ cloudwas in the lagoon and indioated a generaldrift to the west-southwest,The main body s])litinto two pllrts at H+23 minutes and contfrnmdmovementtowardsthe west-southwestat 18 knats~ By H+l hour the clad stretchedcompletelyacrossthe lagoonfrom a very thin dust cloudwas noticednortheastof Yvonne at a high altitude but radar or aircra”treportswere not obtainable. ‘f’heclouduas Ma for all of the main atoll islandnexceptYvonne$broy, and Mack~ A of 440 r was obtainedo~ar debrh in XrO. other readtie at Yvonnewere the water immediatelywest of ground with the highest and vectmad mission were fhm over %Ne@ awl Ujelu readingof 27 m’ over Rome at leOOOfeet-
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4. Falloutforecastwas genarallyaccuratein extent and fntenslty. The mati axis of the cloud was forecastto lie acrossthe lagoodat a 27°ree angle;the actual axis was along 8 bearingef approximately 5. Substantiallyall of the fallout droppedwithin the hazardousarea background rise in intensityto
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Sea Level Pressure — ‘~catteredline of weak echoes,5 miles wide from a mint 270° 30 miles to a point 285° 50 miles. Scatteredellipticalarea of ~derate echoes18 miles wide, increasingslowly,axis from a point 1700 40 miles to a point 220° Lagoon: Near Yvcnme,waves less than 1 foot, period 2-3 seconds,length
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10 FIR was detonatedet 5~e 12 ~q 19589 on a barge off Charlie feet. Initialradarreportsfron the USS ber indicatedthe cloud nxwed on a bearingof 260 degreesat apprwdmatel-y12 knots per hour within the bearingand heightat 90+300feet. Withtione-halfhaur after the burst neitherrad= cculdtrack the cloud, A P2V reportedover the USS Boxer at H+30 mhutis for initialcloud trackingand radiologicalamwyhg ~ 20 Contactwas resumedwith the P2V, and at 0825M on a bearingof reportedo The P?V was directedto fly at 10.OOOfeet east of Nan. At was iaeffectivebecauseof Initialcommdcation cliffkultles. 30 A hsliccptirsurveyby ~=-6 at Nan indicated36 mr/hr at George at 09094 and tidlca~ 37’0mr/hr at Charlieat 0922K other islands 40 The fdlout fO~CaSt wan aocurata~ eaeceptthat tha spreadwas mre northerlythan predicted. The main axis was forecast220 degrees through040 degrees~ and substantiallyall of the falloutfell uithln
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10 BUTTERNJTwas a barge shot situated4,W0 feet west of Yvonne the northwest~with most of the faKloutdepositedin the sea. The only read 100 mr. All of the above Yvonneoless than a mile 2. Falloutpredictionwas generallyaccurate~axceptthat only the northwestquadrantof the atoll receivedsubstantialcontaminationins’ta~ of the whole northernhalf, as forecast. lkarlyall of the falloutfell between the radialsof Z@ degreesto 300 degreesfrom groti z81’oob@ of the radialsis approximdmd at 110 flea; howver8 no are mailable b bear out this estimate. No f~out WQS
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Wet Bulb Temperature AREA WEATHERSUM “ARYTROM AIRCRAFT: ~~d-u~ tops generally4,500 feet, ulth occasionaltops to 7,000 feet. Occasionallight turbulenceat 8,000 feet. High thin cirrustises 45,000 feet STATE OF THE SEA: Lagoonnear Yvonne:Wave height0.75 to 1 foot, period1 to 2 seconds, length 8 to 12 feet.
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10 The KOA devfce was a land surfa~ shot detonatedat 06ZM, approximateyield was 1025 MO Radar establishedthe cloud heightat cloudmoved In a northerlydirectionand topped The main segmentof the and,using Yvonne as an axis, it was vectoredalong thirty-mileradials The entirelagoonarea was surveyedand the aircraftreleasedat 1300M. 3. ~&mr was declaredat 1000M9and the initialhelicoptersurvey on Alice. Mher north-atollislandsrangedfmm 130 mr/hr on Sally to 4. Falloutforecastwas genseallyaccuratein extent ad intensity. Ths main axfs of the cloud was foreaastto extendnortheastof Gene on a 5. It is esthnated that all falloutdroppedwithin the forecast
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but it has not bem detemined if the falloutwas generated~ FIR or 1 by a eomhinatkn of FIR and EOAO ~fwet& Atoll rose to a madmum of \
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Wet Bulb Temperature Dew Point Temperature Scattered(4/10)cumulus,bases 1,800 feet, mming west. Scattered to 1S,000feet. Light to moderateturbulencein clouds. Brokento overcast Light turbulencein lowercirruslayer. STATE OF THE SEA: length 70 b 80 feet. NOTE: Waves increasingin heightat time of firing. Lagoon, site Gene:Waves 1 foot high, period0.5 to 1 second?length
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me WAHOO underwaterdetonationtook place at 1330M,16 May 1958. The devicewas positioned500 feet belou the aurfaae,two miles southwest of Keith Island,EniwetokAtoll. The water oolumnrose Immediatelyto between 1~200feet and 1, !500 feet, followed~ a base surgeto approximately 1$700feet~ and fell back into the sea$ leavingno visiblecloud. Fallout and contaminatedsurfacewater remainedwall withti the foreeastfallout srea and publishedradex. Re-ent= hour was declaredone minute after recordedon Ieroy Island.
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,U,, Jan Franciscoy California Sea Level &es sure Dew Point Temperature At Shct Site: Waves from 0700, 3 feet bi:’h,period4 seconds. seconds. [~atcrd~pth over reef 3 feet.
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