Survey Meter Location in Aircraft.
A specific location for the survey meter in the aircraft must be selected
for each aerial survey.
The best survey meter locations for several
aircraft are given in Table 4-1. If the air ground correlation factors from
Table 4-2 are to be used, the survey meter MUST be located within the
aircraft as shown in Table 4-1.
When air-ground correlation factor data are to be determined during the
survey, the location of the survey meter may be as given in Table 4-1, or
the location may be selected for the convenience of the pilot and monitor.
When aircraft not included in the table are used, such as the OH-58 and AH-
1G, the survey meter location must be selected. All dose-rate readings in a
survey must be made with the meter in the selected location.
LOCATION OF SURVEY METER DURING AERIAL SURVEY
Air-Ground Correlation Factors.
An air-ground correlation factor (CF) is required for calculation of ground
dose rates from aerial dose rates taken in an aircraft during a survey. The
air-ground correlation factor is the ratio of a ground dose-rate reading to
a reading taken at approximately the same time in an aircraft at survey
height over the same point on the ground.
There are two techniques for
obtaining the air ground correlation factor.