Abstract
The neutron backgrounds present in a laboratory containing a neutron source, due to the scattering in the walls, have been measured for fission detectors and for a BF 3 neutron detector and agree to within a factor 2 with the backgrounds calculated on the continuous slowing down model. For a fission detector containing thermally fissile material the relative background at a distance of 20 cm from a neutron source in a cubical laboratory of 10 m side is typically 20%.
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