5.2 RECOMMENDATIONS Operationally, .-day aerial surveys provide little informi..on 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. 61 s7 ~~ oar SD RE EL IR ee IEEE OS A ERMe =