High count rate thermal neutron detectors and electronics

Abstract

Improved, high count rate thermal neutron counters and electronics enabling new, higher measurement capabilities are disclosed. Next generationHe andB tubes may include an electronics package capable of operating at higher count rates and in higher gamma fields and providing more efficient use ofHe gas. Conventional detector systems may also be upgraded, providing a possible solution to measure spent nuclear fuel with high neutron efficiency previously not possible inU fission counter systems. Switching the number of tubes per amplifier allows use of the measured nuclear material for a calibration standard for dead time correction, increasing accuracy of neutron measurements systems. An optimized detector geometry and advanced electronics with double pulse filtering and a dual channel readout may be provided. A bipolar shaper may improve dead time, provide efficient detector use, reduce double pulsing, facilitate high count rate measurements, and allow remote threshold setting.