Item Number CD V-781
Complete Set Out Of Box
Nuclear-Chicago CD V-781 Model 1
Serial Number: 541
From CPG 2-6.2.3 Handbook For Aerial Radiological Monitors
April 1983
In operation, the CD V-781 Aerial Survey Meter is an instrument system comprising the necessary
elements to detect radiation, process the information, provide readout to the operator, and permit
recording of observations for evaluation at the end of the survey mission. If required, the system can
be operated by the pilot alone, but two-man operation (pilot and monitor) is recommended.
The system is designed to resist the shock and vibration associated with normal aircraft operation,
operate at altitudes up to 20,000 feet, and withstand temperature variations from -20º F to 110º F
with a relative humidity of up to 95%. This system can be calibrated to an accuracy within 10% of the
true exposure level for Cs-137 gamma radiation incident to the bottom of the detector case. After
over-exposure to radiation intensity as high as 1,000 R/hr, the system recovers within 1 minute.
These environmental extremes are cited to define the limitations of the system and not as a guide
to operation.
Government price in 1969: $748.41
Government Procurement Fiscal Year 1955 - 1985 1,250
Metering Unit with Accessories
Mounting Brackets - Headphones - Manuals - Power Jack
Size: 10" wide by 4 1/4" high by 3 3/8" deep.
Front of Metering Unit
Readout of 0 - 10 Roentgens / Hour
Measurement is done in the detector unit by 3 Geiger Müller tubes.
Meter Scales - Left to Right:
0 - 0.1 Roentgens / hour
0 - 1 Roentgens / hour
0 - 10 Roentgens / hour
As the radiation reaches 85% of full scale, the next meter to the right starts to react.
The indicator lights over the right two meters come on when the meter below
them reaches 85% of full scale, but only when using aircraft supplied power.
Audio output to headphones rises from 250 hertz to 2 kilohertz over the 3 scales.
Inside Metering Unit
This part gets it's power from the detector unit or simulator unit.
Case is made of aluminum. Schematics are glued to inside of cover.
Front and back of Detector
Size: 9 " wide by 4 5/8 " high by 7" deep
Inside the Detector
This part requires 9 "D" size 1½ volt batteries,
and / or connection to 12 VDC supply from aircraft.
3 Geiger Müller tubes are mounted on a removable board.
If both power sources are used, they are selectable by a switch on the metering unit.
Case is made of aluminum. Schematics are glued to inside of cover.
Front and back of Simulator
Size: 9 " wide by 4 5/8 " high by 7½" deep
Inside the Simulator
This part requires 8 "D" size 1½ volt batteries.
This unit is hooked to the metering unit to provide training for the pilot or monitor.
Case is made of aluminum. Schematics are glued to inside of cover.
Sound Recorder - Reproducer With Accessories
Webcor Inc. Microcorder 300 (Missing Throat Microphone)
Webcor Microcorder 300
The recorder uses 6 "D" size 1½ volt batteries, there is no provision
for connection to 12 VDC supply from aircraft.
Used to provide an audio record of time, position, altimeter readings and radiation levels.
Additional Items To Be Carried On Aerial Monitoring Missions
According to the Office Of Civil Defense Publication FG-E-5.9.1 (July 1966)
Handbook For Aerial Radiological Monitors
