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hat it was possiblo to carry UU” clapacd t- before rcoccupcy. rcsidml radtit im cffccts
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PRIVACY ACT MATERIAL REMOVED on Rongcbp I~md and eastern half of %ngclap-!itoll 1130 Two parties in SJIFLL boats ~occcdcd fron the I 1700 Onc party in & smll boat landed on the c]utcr reef of Mkar Island and surveyed the i.slandjthe ox. IL& Two pm-tics h smll boats procccdcd from the I which was stationed outside Rongcrik Atoll ?.nd sumc: stationed) Canaltho other important isl.mds of the Ate. 1900 Wo parties h sm31 bats prococdcd from t hc : which ws stationcd outside AMnginac Atoll and survc UMl Onc party in a small boat survoycd the northwc,. orn ishnds of Rongclap Atoll and onc pmty rcchcc kcc the litig areas on Rongdap Island and cstabli.shedL rcfcronco location for futurc dccay ma surcmmts, Survey team arrived IMiwct ok Atoll via DDE. ~s of tic Survey team Fivo (5) each of AN/PDR-39 Waro dbratcd ~th an 8~ those tistrmmts, (a ptit of actwl surVoy) in a radiation ftild of 0.320 I it waa fomd th+ U ttica instrluamts gnvo bho Samo reading. Thoso surrey motcrs wcro subject to prolongod uso un&r advcr sc com tires of d@WSs (to the point of sca water splashing over thcm), m dcw With cno exmption, all instmmmta op.r~tcd ~fficimt~ f= tho durath’ of tho oporatim. On the final day it was foun
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Utirik (cistern.at south of In additim to the above, a sm@e of foibgc was taken at the wim ward side of Mkar IsLlmd~ The radiation field wns 180 mr/hr on 9 ~~rch 195 at this pohte tion c2n produce extre=ly serious radiological m ntaaination over a dis?.twx b. The center of the conttiat im pattern frum the E%’.~ STlotMC between BiJdni and Mkar. grep.ter at the north side of tie atoll, twenty miles away, protection to persmel inside. f. The AN/PDR-39pmv~d to be a very mtisfcctory instmcmt for g, -A sfi@e DDE with two (2) whak lmats is not a completely sati~ complete~ Future surveys Shoti mnsider using vessels capabk of cnterin[
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covery prcgruna and prepJutilons for futuro detcmttions at Btki.ntAtoll could only be accomp!!s~edby personnel warklag from ehlpsanchored tn the Iqoon. Each detonation resulted in depe~d~ on the yield and lwtiion of the shot with respectto theuchor~e sites. from the subce md 90 ft below tic tixe, at -bus pints LO tie lagoon The sunples were turned over to the -iCM A.dY6is Sectioq where the spec Uic beta activity tn microNSO ~ titerest was the drt-nkbg water on the ships since it was derivdfrom tie ~~fidsc malymsi for beta actlvlty in microcuiespermfflfltter.NO dr~+ water on bard tie Sh$# wu found to conti w appreciable racftoactive m.atertal. Ln tiew of tie fact that the actitity found in the Iagmn tier wan associatedwtththesedlrnentleftaftere~aporat@the be observed v’isuaLIy as a re~t of the seclbenf being deposited in the vnter ud could be etitied adequately using bnly ~ PDR-W surveytypemeter operated from a helicopter hoverhg over the surke of t-he water. A.s & result of using this technique, foLlcwing the Morgen.sten event tbe number of Iagmn samples to be uxa.lyzed was reduced considerably md more tie could be devoted ta more pefi’~ent problems (see Fig. 5.1). were collected at the time the natives were evacuated from the island on 5 bf~tband followed to the end of the operationfordecaycharacter~stics.The speclficact~~ityofthese=ples erance af 5 x 104 LAc/ml. A repreeen’a:i~e decay cwe for one of these mples is shown in ples taken on the suney trip to Rongelap and Uter{Lk islands incUcated u average specific actainednoa.ctltityandUe notincluded in tie above values. thrcm.gh x U-k filter pper, were used on the initial survey flights followhg each event and durtng those periods whenfall-out occurred on board ship. With the lnst.rurnent on for 15-mtn lnte~s during the fti-out peri~ a continual check could be made as to whether fall-out was SW occurr@ amd at least a qudi+ative esttmate could be made of the order of magnitude of the ccmcentiation af the radioactive cont~ination h microcuries per cubic footof ati. USQ sucha IUge-stiedftiter paper necessit.ales folding the paper twice in order to p!ace it on the bottom of a krge lead pig.OnlYgTosscountspermLnute were obtained tn counting, After tiese kdt’hl da-a were takeq however, t smti portion of the filter paper was mounted on a brass p!mc~ettidfollowed for a Period of tkoe tnorder to omh he dew c~r~~er~~ics ~ ‘e =ple. The decay c-e for two such ea.mplee, collected after Alarm Clock and Runt Q ze
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WJtrzjecto~ for the twenty thas ‘.foot level. This trzjcctoq, fomcrly hazard problm for surfecc arxlsir routes ~ but that f~-~t On w ~AtO~O that it was not anticiptd further action would be neccssa~. priate nezsmrcs we~ institutd by the Navy Task Group Cmnander to”the effect that all pcx%onncl na essmtid to open deck duties would r.ecn.b of the island where rextinqs from 1+.’llflll~TIB instm=ents were 200 mr/’hr at 502 feet am! 359 nr/hr at 250 feet. ma letter redhg ~d a r~~u:st for additiond aircraft was relayed back to TG 7,4 via K!f.”,J;J+IN. Upon Iandine at uJGW\l~ at ~3~~s UC monitor adtised the detschnmt to evacuate. ‘l%efoll.cwi-ngad~ti-.l rec!saf c readings were tdcen: in the mmnirsz,) was low because the builtinc had been v.shed dcwn car= of a bed in a IJvin.gtent: 1200 m~. at Ztiut u~.:, 2 ?Ja~h l Ilheto non-zvailabUty of additional whims airlift, MC pmintig 20 personnel were pickedup on a return t=p, and intensity re&in~s it was mutually qreod not to authorize ewxuaticn and t 0 request ~LcEat5. on intcm sity r=~WS l This resulted in the pzzltig m/’hr at 250 fectc It was nutuu abmed (by the ‘XG 7.4 and Task Farce
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f d. If lagoon cmtdmt im would beoone a eerioua probkz to ships. TIM above idor~tion w.a passed on 31 W.rd\ to CRKPACFLT in accmdzmce tith On 31 Narch Sn.foxnationwam raoeived<m the X3 7.3 tit an Kwajalein to the effect that 9 am hr ‘ were obse~d an the wind~ aide of M. be iesbted and tkt a pint l-e be taken for andysie. The f acQi- (%.bsequent exdyaie intited no acti~y in the five saqles Wsen euoept miving at port with mxlionctive tuna O These *iea indioated that Wxne d the oatck uaa destroyed, Te68d8 repfi~ radioactive, but no ~e80 gmti b the Met northeati of m.
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