Adreraft
The contamination level on the YAG-39 aircraft WES SO
low that a decontamination study was not warranted and the ef-
fectiveness of the washdown system could not be evaluated ac~
curately.
The YAG-40 aircraft was sufficiently contaminated
to warrant an experimental decontamination study.
began on R+5 and ended on R+9 days.
This study
A series of decontami-
nation processes were employed which,with the aid of one rain
squall and decay, reduced the gamma radiation level at the
cockpit from 850 mr/hr to 45 mr/hr.
At the same time, the
gamma intensity level on an area on a wing section was reduced
from 10 r/hr to 85 mr/hr.
The left magneto on the YAG-39 air-~
craft would not cheek out when the aircraft was turned up after
the test, but no material damage was detected on the YAG-40
aircraft.
Interior Contamination_
Air samplers and particle collectors operated normally
over the designed time interval after debarking, shutting off at
H+t44 hours.
Maximum field intensity indicated by gamma
detectors on the YAG-+0 occurred at about H+8 hours.
However,
precut sections of ventilation duct continued to be exposed to
activity deposition until H+1% hours.
Neither air samplers
nor duct sections showed appreciable activity.
Two topside
nillipore filters showed moderately high ectivity but here the
existence of surface streaks leads to suspicion of direct fallout contamination rather than collection of airborne particulate
mg
nent
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