a
The purpose of this study was to evaluate the inhalation hazard
to which aircraft crews would be exposed on passing through an atomicbomb cloud and to determine the degree of the inhalation hazard relative
to the external radiation hazard.
The sample for the cascade impactor was obtained from the cabinpressurizing system in the drone F-80 aircraft through the standpipe on
the right of the pilot's seat in the cockpit.
Three cascade-impactor samples were collected in the cloud result-
ing from two air-burst detonations.
after the detonations.
Samples were collected from 2 to 7 min
The particles collected ranged in average diameter
from less than 0.1 » up to 4.2 »; and over 95% of the activity present was
associated with particles less than 0.2 »p in diameter.
The total individual internal-radiation dose resulting from the
inhalation of fission products during the cloud passage was calculated, using
certain basic assumptions, and found to be 1.9 mr. This internal dose is
negligible compared with the integrated, external gamma dose of 30 r.
A preliminary report of this work appeared as CRLR 188.
CRLR - 300
.
-
AN EVALUATION OF SOME LIQUID ADHESIVE KW AGENTS CONTAINING
VARIED PERCENTAGES OF ZIRCONIUM-NIOBIUM OXIDE.
Robert J. Smith, Seymour Tarras, and Malcolm G. Gordon,
4 February 1954.
SECRET-RESTRICTED DATA
,
The objectives of this investigation were:
(1) to determine the
adhesive properties toward asphalt and concrete of mixtures of silicate in
water, polystyrene in ethylene dichloride, and polymethyl methacrylate
(lucite) in ethylene dichloride, each containing from 3% to 40% of radio-
active zirconium-niobium oxide agent; (2) to study the effects of various
drop-sizes on retention (resistance to decontamination) of the three
mixtures; and (3) to determine the drying time of the adhesive agents at
various temperatures.
The asphalt and concrete test-pieces were contaminated with drops
released from glass dropping-tubes of different orifice size and at various
heights.
The samples were counted, decontaminated by a wet-~-brushing
technique and counted again.
Of the silicate~agent mixtures, only those
containing less than 10% of agent were retained satisfactorily on concrete;
the retention of all such was unsatisfactory on asphalt.
The lucite-agent
and polystyrene-agent mixtures were retained on asphalt when as much as
40% solid agent was used, and on concrete with up to 30% solid agent.
silicate solutions dried slowly at room temperature and froze without
drying below 32°F.
The lucite and polystyrene solutions dried quickly at
room temperature and only slightly slower at 30°F.
and shriveled after a 6-hr exposure.
RES!
The
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quam
38
‘They both froze at O°F
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