Abstract
A neutron detector has been built and tested for use between 1 keV and 1 MeV which possesses the following properties: 1) useful neutron efficiency over the full energy range, 2) fast time response, 3) low sensitivity to gamma rays and gamma flash, and 4) good background rejection capability. It consists of a 1.25 cm thick by 25 cm diameter disk of 235U positioned inside a cylindrical shell of plastic scintillator which has been divided into quarters. The axes of the disk and the cylinder are colinear. Neutron induced fission events in the 235U are detected in the plastic scintillator by requiring a triple coincidence between prompt γ-rays and/or neutrons.
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