Measurement of Neutrons Reflected from the Surfaces of a Calibration Room

Abstract

Measurements of the variation of the response of 9-in. spherical rem-meters and 3-in. Bonner spheres with distance from a Cf fission neutron source are presented. Measurements in two different calibration rooms show that the response of an instrument to neutrons reflected from the walls of a room is constant over the central volume of the room. Approximate expressions are given for understanding the response to reflected neutrons in terms of the energy of the neutron source, the type of detector, and the size of the calibration room.