ground, a constant ground speed, and a straight flight direction between the
starting and ending checkpoints of each course leg.
a. The pilot locates the starting checkpoint of a course leg to be
flown and either locates the end checkpoint or determines the azimuth of the
b. The pilot flies the aircraft on the proper course to pass over the
initial checkpoint on a straight path to the end checkpoint.
course, the pilot alerts the monitor and gives the height above ground.
Shortly before reaching the initial checkpoint, the monitor records the time
and height above ground.
c. The pilot commands "Mark" when the aircraft is directly over the
starting checkpoint at which time the monitor reads the survey meter,
records the dose rate, and begins timing preselected time intervals (for
example, every 15 seconds).
d. The pilot again alerts the monitor when the aircraft approaches the
end checkpoint. When the aircraft is directly over the end checkpoint, the
pilot commands "Mark." At this time the monitor reads and records the final
dose rate for the course leg.
Procedures for Using Point Technique.
Procedures for using the point technique vary according to the situation.
a. When the situation permits, the aircraft lands near the point of
interest and the monitor dismounts, proceeds to the selected point, and
takes the reading by using normal ground monitoring procedures.
b. When the situation does not permit use of the above procedure, an
estimation of the ground dose rate may be made by use of an air-ground
correlation factor and an aerial dose-rate reading.