2.5
THERMAL-RADIATION DETECTOR
The thermal-radiation detector consisted of a phototube, amplifier, and high- and
low-band-pass filters. The phototube output was produced by incident-thermal radia-
tion from a nuclear deyice, lightning strokes, or other sources.
This output was fed
to a high band-pass filter that passed only signals with a rise time similar to those
caused by nuclear detonations and to a low band~pass filter that passed only those sig-
nals with a duration typical of nuclear detonations. Thus, an incident thermal-radiation
signal had to have both a rise time and a duration typical of nuclear devices in order to
activate the therma!-radiation detector.
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