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3.6 CALIBRATION
Calibration consisted, essentially, i: termining electron-beam: deflection of the cathoderay tube corresponding to material density along the beta path. Since the deflection sensitivity of the cathode-ray tude was constant, calibration could also be done by measuring the
deflection voltages corresponding to known values of material density along the beta path.
In the field, calibration was accomplished by:
1. Recording on film, just prior to installing each instrument station, electron-beam deflections corresponding to several known values of deflection voltages.
2. Recording the elect: on-beam deflections corresponding to known thicknesses of two
aluminum foils over the receiver. The aluminum foils are released one at a time between H-5
sec and zero time. Thus, a calibration trace obtained just prior to shot time appears on the
samefilm with the density record.
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The information from field calibration when checked against laboratory measurements of
deflection voltages and be~m deflections corresponding to known values of material density in
the beta path enables one to convert the record of beam detlection into material density. The
calibration foll-release circuit is shown in Fig. 3.8.
3.7 INSTKUMENT STATIONS
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Densitometers were located at four stations:
Station No.
690.01
690.02
690.03
690.04
Site
Distance from
ground zero,ft
Engebi
Kirinian
19,166
23,219
Aomoa
47,897
Bokonaarappu
$0,501
A detail drawing of the instrument staiion is given in Fig. 3.9.
23
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