5.2 RECOMMENDATIONS
Operationally, D-day aerial surveys provide little information because of the necessity of
avoiding active fallout. Even light contamination on an aircraft hinders surveys on later days
when the intensity from the sea is reduced by radioactive decay. Unless the aircraft can be
decontaminated, aerial surveys should not be made on D-day.
With regard to instrumentation, a linear-scale radiation detector would provide more accurate
and more readable recordings over water, where most of the gamma dose rates are slightly
above the natural background of the sea and the aircraft. The logarithmic scale is essential for
surveys over land, where a wide range of intensities must be measured.
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