although there is little possidosimeters can be made adequate with minor changes,
intensity ranges.
bility that any one type can be made adequate for all
No particu-
gh several cun be correct
lar type of survey meter was entircly satisfactory, althou
ed by the elimination of minor flaws,
Telemetering crater survey units dropped by
necessary.
aircraft performed fairly satisfactorily, although some modifications are
Airborne radiac equipment performed adequately.
For 4 more detedled discussion of
Program 5.0, see Appendix "E",
12.
PROGRAM 6.0 — PHYSICAL THOTS AND MSASURMMENTS
The objectives of this program were to deturmine many physical cffects and
characteristics of atomic bomb detonations,
These included: particle sine end dis-
es, falltribution studies, thermal effects on miterials, cxposure of combat vehicl
out distribution, interpretation of survey metcr data, evaluation of filter maber
jals, contamination and decontamination studies, radiation field of the atomic cloud:
evaluation of protective clothing and collective protector equipment,
Instrumenta-
:
ge
» BS
iti
tion, in general, operated very well, |
The maximun thermal effect was observed
from one-third to one-half second after detonation; dust greatly reduced thermal
radiation, especially at close stations.
Practically all thermal radiation damage
occurs in the visible and infrared regions of the spectrum,
‘The experiments with
M26 and M-1.6 tanks showed that, for a 50 Kkiloton, 300 foot tower detonation, both
radiation and blast effects would cause a vory high percentage of deaths among the
crews within 1000 yards,
-
Depot maintenance would be required on vehicles within 750
yards; beyond 1200 yards no damage would be incurred.
The study of fall-out showed
that over 90% of the total activity of the samples collected was contained in the
greater than 20 micron fraction.
Individual particles wore mostly black spheres,
either alone or attached to sand grains.
The interpretation of survey meter data is
contimiing; no definite results are available now,
Preliminary results on filter
matorials indicate that filter efficiency of the materials tested approximates that
determined in the laboratory.
In the contamination-decontamination studies 1% was
determined that cleaning methods must be carefully selected on the basis of both the
material and the type of contaminant.
In studying the cloud radiation field it was
found possible to accurately define the cloud boundaries, and that the greatest
radioactivity occurred where the greatest particle density occurred.
The study of
protective clothing showed that ordinary laundry facilities are entirely successful
in removing radioactive contamination.
Collective protector equipment appeared-to
bo
ee
Peieaaiaea
te
Ee TS
Gerla eS
eatrag eypee
ATU CRESS ‘t ART ~~ Jeo