any biologically accepted value,
The ability to control this exposure, to
predict the other flight variables, and to choose appropriate times for
cloud penetration formed the basis by which sampling collection was
conducted within an
economy
of radiation exposure,
This
economy
was
made quantitative through a relationship which expressed the amount of
debris collected as a function of radiation exposure received and the
other flight variables,
On a single penetration of a cloud from a nuclear explosion a sampling
aircraft collected a total quantity of fission products and "unburned®
debris determined by the total effective filtering rate-of the filter
devices which it carried, the volumetric concentration of fission products —
in the cloud, and the time of flight through the cloud,
The crew of the
aircraft received an exposure determined by the radiation intensity within
the cloud (excepting radiation shielding structures in the aircraft) and
the time of the flight through the cloud,
The total effective volumetric
filtering rate was proportional to the number of filter devices carried,
the true airspeed of the aircraft, the area of the filter paper carried
in each filter device, and the efficiency with which the filter paper
retained the particulate matter,
If the mass of concentration: of inert
material fromthe detmation was low the radiation intensity in the cloud
was to a good approximation, proportional to the volume concentration of
fission products, to the amount of radioactive decay which took place since
the explosion, and inversely proportional to the air density at the altitude
' of penetration,
Assuming that the radiation exposure received by the crew
207
AFWL/HO
.
SWEH-2-003)
no
oF