3=3/729.3 lL December 1953 SUBJECT; Radfological Hazards in the Usrshall Islands .resa During C..STL> 8 Reference paragraph S, your letter, similar adviscriea (ref- erenew 1b) are planned again far Opernticn C.STLS. Particulzr attenticn ~is invited tc the H minus 18 huur message. Dus tc sh.t tires in the early arning heures, and the necessity for final shit decision brief- ings to take place after 21) daylight woather infcermtion has baen col- lected and analysad, it is considered that a tentative YH minus 18 hour planning furecast ie necessary. In the ovent the H ainus 18 hour forecast ie signifisantly in error, @ acdificaticn advisory will bo dispatchn— odaftar the e-mnonder's final ahot decisica briefing st abcut H uinus Ours. . ‘ ‘ a * 6. asference paragraph 6, your letter, tha fullewing ccansnts and reccamsndaticns are mader &. - Toaporcry evacuatiun of artive populated islands is act recvamonded 48 3 preeshct coagurs. b. airborne survay of ths Hawaiian, ‘farehall, Caroline ind -larlanas Islands, supplomontcd by gruund chocks as practicabla, in cc» operati.a with tho...tcmis Mergy C.mieeicn is ennsidered o valucble adjunct to the radesfo plan. Overlap cf infcranti:a in suppert .f this effort. will be furnished by CUTF SEVEN tu the .EC reprosontative in the Porward .r3a sach thit actual survey Slighte will bo nocess ry only in the ovont fall-out is fcrecest. cr known to oxist in the -rea in ques~ oAe It is ansidored that such coverage is practicable ind will be oxtremoly useful t. *l1 c-mminds ond igancies ¢.aserned with cloud tree joctcry anslysis in tho Preific ..rca. Ce Fila badge survey of ‘‘aks anc J.hnst-n Islands. This type survey isc.nsidered degimble if for m thor rosa. a than tc previde ~pesitive evidence that nc ccntaninaticn was enccuntored, Since thy fila badge-is.@asidered tho coly. legslly acceptable rverrd ¢ radizticn ax- pusure, Lt Le suggested that such a survey shculd be extendec tc significant. aatime populated atclis,..If desizrgd, task forgeS1in badge sup~ pay end pri@uscing facilities can be ands available ts assist. wt80h @. te mA Reecanaissanse flights by socurity aircraft of TG 7.3 to clear itinerant ebippiog fr-a thepredicted aloud passage area up tc 600 ailes on amt ainus 1 to 2 days are c.nsidered a valuable radicl gical safety precauticn. Such flights ere ,lanned again fcr ¢..STi. It ie suggested that, in the interest <f reducing the number <f snips tbe cleared frm the area, CINCP..CFLT effoct appripriate advance <iver~ siuna of surface ahipping wherever practicsble. .2 a first asprexica~ tiuny it 4a. masidered that the sectcr trea centerod un ground serc clockwise frum 225” true to 90° true, saxioun distance 500 nc, shculd be avoided un shit day. Task force advisories aay ba usec by CINC?.C tu infirm oporati.anl ccatrol authcritios of further wuuting ocdific«= ticns as required. e. It is anticipated that roccamendati.as will cgain be mace by this headquartars reference closing uf air rcutwa. C.nsequantly, the Gun .Godnistratcr shuld bo inf.rned -£ possible interference with alr gcc}