at the corresponding scales and radiation fields shown in the chart
below.
Switch Position
Seale
Apply
Adjust
Radiation Intensity
Resistor
A
0.005 mr/hr
R=35
B
O.1 mr/hr
R~36
Cc
10 mr/nr
R-33
D
1000 mr/hr
R-3),
Altitude Compensation Circuit
The proper compensation voltage for attenuation factors corresponding
to a particular contaminated area can be determined and set while in
flight by the following procedure.
A.
Be
C.
2,
Make passes over the same section of a contaminated area at
200' and 1000',
Subtract the current reading on the aircraft radiation recorder
obtained at 1000' from the one obtained at 500°.
Then using the curve shown in Figure 11, determine the
voltage corresponding to the difference in current between
the 500 and 1000 foot readings, adjust R-38 to obtain this
voltage across the compensation potentiometer.
Operation
To assure minimum radiation absorption by the aircraft, the "Top
Hat" detector is positioned so that only the skin of the aircraft
separates it from the outside.
in the tail section.
The most suitable location is usually
Also, the tail position is furthest removed
from radioactive dial instruments in the pilot's compartment.
fhe
control box is located with the operator.
To set the unit in operation:
A.
Set the altitude compensation toggle switch (S-2) to either
"automatic™ or "manual" depending on the type of operation
desired.
When using manual altitude compensation, the
- 2h =