- 33/1293
“.
iL Decaaber 1953
SUBJECT: Radiclegical Hasards in the darshall Islands ‘rea During C..STLE
Islands.
(4)
air and surface routes through “ake and the Yarshall
These sreas sre cunsidered cf least pricrity because of sep-
“arate advence plans tc close ur swaep the most questi-nable sroas,
bd.
Cloud tracing Ans been plinnad cceerdingly 1@ fclicws: ~
(1)
In support of 3a(l) abevu, starting at H Hour, cne
aireraft will mcintain a holding pattern for approxiastely 5 hours ¢cwn=
wind from GZ to establish the drift uf e.ntaminati.n toward iniwetck
and/ur Ujelang.
In additicn,~the cloud sanpling team will reprt cn
drift and intensity of 111 segnants cf the cloud fren H tu H plus 6
hours. Further, it is planned that all cperati:.nal and test airemft
will repert any enccuntar with rodiaticn while ungcgod in their assigned
flight missi-ns. The totality cf inforneticn abowe, togutnher with the
forecast tr-jectcries, shculd be sufficient to prosent a roas.nibly
clear indicaticn <-f future cevelc pmants uf the cloud, ind in sufficient
tine to werify decisicns relative t= safety of personnul outside the
stct area. This informati.n will aleo be used to formulate a decisicn
relative to ths air and surface r.utes through the uorshalls.
(2)
In support of 3a(2) above, from appreximately H alus
§ hours to H plus 12 huurs, one rirereft will search up-wind in a 30
degree sector,. apex on.GZ, and centered on the average trade-nwind for
approximately 500 Nl.
.
(3)
In support of 3a(3) above, from approximately H plus
(&)
In support of 3a(4) above, from approximtely H plus
12 beurs to H plus 18 hours, cne aircraft will search upwind in a 30
degree sector as acuve, with apex on Rongerik .toll.
18 hours to H plus 24 Roure, one afiroraft will be vectcred alcng the
routes through “ake, or through the area forecsst tc be upewind {rea
these rcutes, as appropriats.
(5) Two additional aircraft sre planned to search froa
H plus 24 hours to H plus 36 hours, and froma H plus 36 heurs to H plus
48 hours,
Tho flight tracks of these airercft will be detormined after
the shot and ..i11 de based upon the results of the first 2honur pericd
“and forecast metecrological cunditicns,
CG. Other features of the task force plan remain unchanged
exsept that appropriate ocamonts relative tc native evacuaticn ire prosented below as they apply to pertinent paregraphs cf your lottor.
be
Reference parigrarph 4, your letter, action has been taken t
inform CINC?..C by reference le of the huzards to bu intricuced intc
the Pacific ..rea during C..STLE.
a
e-/6