A Simple Calibration and Checking Facility for Fast and Slow Neutron Detectors

摘要

A simple facility is described for checking the sensitivity of dose-rate-instruments for fast neutron detection, and for calibration of thermal neutron detectors. About 7 million plutonium-beryllium neutrons per second give a tolerance flux density of slow neutrons from the vales of a cavity in paraffin or water. Construction drawings of the cavity are given, and for the dimensions specified the constant is given for convert-ing any plutonium-beryllium flux of neutrons to combined thermal and epithermal flux densities, so that instruments can be calibrated in standard flux densities.