2e2
COLLECTION
OF SAMPLES
The fallout samples were collected at stations established by the
personnel of Projects 2,5a and 6.4.
The location of these stations and
details of the collectors used are given in the reports of Projects
2.58 and
behe
.
Chemical and radiochemical studies were made on samples from Shots
1,2,3, and 4.
Limited radiochemical measurements were made on samples
from Shots 5 and 6,
Physical data on the nature of the fallout were obtained from
Shots 1,2,4, and 5.
2.3
EQUIPMENT
The analyses at the site were rerformed in mobile laboratories
budlt in trailers.
These laboratories were equipped with conventional
chemical apparatus and several tyres of special apparatus as well as
beta and gamma counters, A gamma spectrometer was located in an air
conditioned building near the mobile Bboratories.
The equipment at USNRDL consisted of conventional apparatus for
chemical, radiochemical, and physical studies as well as several special
types of apparatus. Included in the conventional equipment were bsta
and gemma counters, an emission spectrogr_oh, spectrophotometers, X-ray
diffraction apparatus, a petrographic microscope, a crystalab ultra-
sonorator, Model SL 520, Beckman pH meters, ion-exchange columns with
accessory equipment, and the standard apparatus found in chemical laboratories. The special equipment included aerosol sampling devices
and film coating, developing, and scanning apparatus,
2e3el
Sample Collectors
Samplers of two types were used fcr collecting fallout for
chemical and radiochemical studies, Also, some of the samples from
Project 2.5a collectors were studied on this project.
One type of collector consisted of three legal polyethylene
bottles fitted with 7-in. diameter fumnels of the same material mounted
in a frame with a mechanical device arranged to uncover the three funnels
at detonation time and cover them again after 3 hr. These samplers did
not operate originally as well as had been anticipated but after sone
modification operated satisfactorily.
The other type of collector was a collecting funnel 6-1/2 ft x
11 ft built onto a life raft and arranged to drain into a 13-gal polyethylene bottle, Because this apparatus was inadequately designed and
constructed to cope with conditions found in the field only a limited
number of samples were obtained from it.
2.302
Counters
The beta detectors were NRDL Model PC-l proportional counters.
coaxial anode type,
These detectors were of the cylindrical, side-window,
20