+
2.2.5
Program 13, Alpha Measurements
a.
Objectives
-~
To measure alpha as a function of time for the fisston devices.
in order to determine whether they worked properly and in case
they did not, to aid in diagnosing the trouble.
b.
Techniques
1. Alpha detectors, each consisting of a plastic fluor and photocell or photomultiplier combination in a HUght-tight can, were mounted at
aporopriate distances from the device to give a wide range in sensitivity.
The signals were conducted over cvaxial cables shielded against gamma,
neutron, and electromagnetic radiation to concrete bunkers. These signals
then were displayed on a series of high speed cscilioscopes together with
timing frequencies and were recorded by cameras.
2. Data were obt ined by measurements made on the film traces
and analyzed to give the time history of alpha of the device.
Results
The results of the alpha measurements are given in Table 2,4.
alpha recerd is particularly useful in understanding the behavior
devices.
2.2.6
The
3
ce.
Program 15, Photo-Physics
2.2.6.1
Diagnostic Photography
a.
Qbjectives
1.
To determine yield by fireball photography.
3.
To determine symmetry of fireball growth by photography.
2.
b.
To determine yield by Bhangmeter records.
Techniques
1. Framing cameras were operated from three or more photo
towers on each shot to record the fireball history.
2.
Measurements of fireball radius as a function of time
made from the films.
the yield.
were
Empirical scaling was used to obtain an estimate of
3. The time history of the light intensity was obtained for each
device by a photocell-oscilloscope-camera combination to give the time to the
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