The last two are not radiac devices, but are included in this sec~
tion for convenience of presentation. A description of each device is
given below, All radiation-measuring devices wre calibrated at Nas
prior to the Operation. They were recalibrated intermittently at the
test site using a Co © source.
e
2,1__KAEC ModelM1432 Autozaic-PeordingRadiation=Rat
Coast Elec-
(PeMeter).
The P-Meter was designad and built by the West
tronics Laboratory of the Kaiser Aircraft and Electronics Corporation
at Palo Alto, California, under contract with and according to epecifin-
cations furnisted by Air Force Special waapons Center (AFSC),
Seven
recorder unit) and one nonairborre component (playback unit).
A block
complete assemblies were procured. The equipzent consisted of three
airborne composcents (probe, power supply, and compressor-amplifier-
diagram showing the relationship of theses units constitutes Figure 2.1.
The entire airborne assembly was mounted in the nose section of a
B-57B, The instruments were operated by the 28-volt aircraft powr
Supply. The wire recorder could be Started manually at any tim during
aitinn Ai
the flight by means of a switch in the pilot's compartment,
It could
also be started automatically by use of tke intervalometer setting.
Once turned on, it continued te record until the recording wire was con-
pletely used (about 2 1/2 hours) or until the power was turned off.
r
=-----------~--.
Wire
_
1 Recorder
Blocking
Oscillator
1
Gamma
[1
Scintillation Probe
<SPRaao ==Pi
Automatic
Recorder
A/C 28v
A/C 28v
Bristot
Chart
Recorder.
+150v
Time Morker
“ON" Control
[77]
Integrating
Circuit
au
-,000v
28v dc
& + 28v
.
Univibrator
Supply
a+150v
A/C Supply
AIRBORNE UNIT
<7
Power
4-Stage
Amplifier
Wire
Playback
Recorder
GROUND PLAYBACK UNIT
.
Figure 2,1
(P-Meter).»
Block diagram of automatic recording radiation rate meter
ee ee
ee
_
The probe was the sensing elezent and consisted of a Scintilon (trade
- pans used by National Radiec Company) sphere, DuNont 6292 photo-multiplier
tube, and a regulated voltage divider with temperature compensation. This
was housed in a 2 1/2-inch diazeter aluminum tube having a wall thickness
of 1/16 inch with an added 0,01 inch of tin outside the hemispherical end
thet covered the Scintilon, The inside of this hemisphere was coated with
sinc sulfide in order to enhance low-energy response so that satisfactory
performance was obtained from &) kev up to 1.3 Mev, ©
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