Abstract
We describe the design and calibration of the neutron-detection equipment used in support of the INF Treaty, and some measurements made on Soviet missiles. The fast-neutron detector, consisting of twelve 3He gas proportional tubes in a cadmium-covered polyethylene moderator, produces about 67 counts/s in a flux of neutrons from 252Cf equal to 1 neutron/cm 2s. This detector is used to determine the spatial pattern of neutrons emitted from the nuclear warheads on the missiles.
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