Electron Multiplier Neutron Detectors

A standard photomultiplier tube having uranium coated on the cathode is proposed for use in power reactor control. It will cover the neutron flux range from 106 to 1011 neutrons/sec/cm2 or the range from 103 to 108 neutrons/sec/cm2. The electron multiplier neutron detector will compete with gamma compensated ionization chambers. Electronic discrimination of both gamma induced pulses and the natural alpha activity of the uranium is used to reduce the gamma sensitivity of the system.