Lesson 2/Learning Event 1
Readings taken in the aircraft are multiplied by the air-ground correlation factor to obtain the estimated
ground level readings one meter above ground.
When an air-ground correlation factor cannot be determined due to the tactical situation, terrain
conditions, high radiation dose rates, or other factors, the air-ground correlation factors shown in figure
7 below are used. To estimate an unshielded ground dose rate, multiply the aerial dose rate obtained by
the correlation factor from figure 7 for the type of aircraft and the height above ground at which the
reading was taken.
FIGURE 7. AIR-GROUND CORRELATION FACTORS1.