Type of neutron detector BF3 Type of signal cable RG-59/U coaxial

Location of pulse preamplifier Instrument pit at edge of loading-face shield Location of pulse amplifier Control room Distance between pulse amplifier and preamplifier 200 ft Distance between neutron detector and preamplifier 75 ft

Method of grounding Single-point grounding system The detector and the preamplifier are isolated from ground. The coaxial-cable shields and all external chassis aie grounded to the pulse-amplifier chassis The pulse amplifier is grounded to the nuclear instrument panel Operating problems and modifications When placed in operation, the system was plagued by noise bursts, high-level background noise, cable ringing, and electromagnetic pickup so large in magnitude that neutron pulses were not distinguished by the system Many multiple grounds in the system were found and eliminated. The system was converted to a single grounded system by insulating the detector and preamplifier from ground and tying the system to ground at the pulse amplifier The system was improved greatly, however, some disturbances were still present in the system These disturbances, although not large enough to prevent operation, were annoying, and it was felt that the use of triaxial cable in the system would eliminate the disturbances altogether