a
2-11
g
and spectrum as a function of distince NIE30.
To
achieve this objective, the project participated during shots Yellowwood and
Valnut,
The measurements were extended turin: the field nhase of the opera-
tion to include shot Tuince, and tris perticipetion is covered in the portion
of this report relating to th:t detonation.
To make the necessary measure-
ments, threshold-activation and fission detectors were exposed as a function
of distance from the Yfellowwood end Valnut vero points.
These detectors in-
cluded gold, cadmiumeplated gold, pluteniunm, -: xtunium, uranium, sulfur, end
girconium.
Since land masses of sufficient siz: were not available for dis-
playing the detectors with distance, a buoy line was used.
from 917 to 4,100 yards from ground zero Zor beth sncts.
The line extendec
Due to the radio-w
logical situetion that existed after these ictonations, recovery could net
be effected witil D+l day.
data was obtained.
xs a resul+, only limited neutron flux and dose
“arly results indic te the: the neutron dose for shot
Yellowwood was lower than prediction (by MT -23+200) by a factor of 2.3 and
the “.alnut doses were low by 2 factor of 2.06.
Fallout Sempling.
This was a determirs-icr af the relative contribution of
certain isotores to both locel and world-wide fallout and the use of this
information, if possible, to det-rmine wne fraction of total bomb debris
deposited in the local area,
Th: groieet
ves divided into two separate
efforts.
1. The collection of early clou: samples by means of newly developed
rocket samplers.
2.
The collection of residual cloud samples anc fallout debris by air-
craft.
The rocket sampling was to have teen accomplished with rockets being
developed by UCKL Project 21,3.
Gas and particulate sampling of the residual
cloud nas accomplished by Be57° aircraft i.ncer the technical supervision of
LASL personnel.
fa)
COPEns
+ Leiet ag
Fallovt samples were col.ected at various times after the
war
2
pcs ZS