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HEADQUARTERS
TASK GROVe 7.1
JOINT ASKED FORCE 7
Los Alamos, New Mexico
.
S February 1953
APPENDIX I
to
CLOUD SAMPLING RLOUIREMENTS FOR CASTLE
1,
Introduction
The collection of samles of airborne radioactive debris from the cloud
resuiting from the explosion of a test weapon or nuclear device is of the greztect value to the weapons development program. These samples susport critical
recinchezice] measuremente which provide an absolute determination of the yield =~
or exergy release of the weapons is one of ite most important characteristics.
in order to permit timely action for their support, the following
. Teguirements for manned aircraft to accomolish cloud sampling on CASTLE are sub-
' mitted.
These requirements are baeed largely upon IVY cloud sampling experience
end results. They are supported by the fact that ths amount of radioactive
matericl collected by a sampling eircreft is quantitatively and directly pro=-
portional to the performance of the filter device used, to the speed performance
of ths aircraft, to the radiation exposure of the sampling personnsl, and to the
extent of radioactive decay which has occurred after burst by the time sampling
is performed. The largest possible sample for a fixed biologically acceptable
radiction exposure will be obtained by use of the highest possible performance
filter devices, and a high performance aircraft which samples as long as possible
efic: buret as is consistent with cloud dispersal phenonmenz. As a result of
IVY ene Naveda teat experience, it is possible to state the samole sizes required
for the CASTLE devices in terms of the radiation exposures and equipment per~
formanee used in tho past.
Further reduction of IVY cata and dovelopment cf over-
atioval concepts may modify, to some ex:tent, the requirements submitted herein.
2.
Senale Requiremente
a.
Number
Six primary samples are desired of each of the six devices tested.
One special sample at highest possible altitude is desired, in addition to the
prim-ry six, for at least four of the six devices,
b.
Size
The aise of eech primary sarole will be satisfactory when each re-
preecnis the amount of material collected on seven to eight squezre feat of special
Lizte> paper by Lilter devices which have a performance equivalent to the Fletcher
wing tip type used on IVY, when the sampling pilot exposure on landing is 3.5
KY
COPiED/DOE
. LANL RC
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590582 Si
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