Calibration of reference thermal and epithermal neutron flux densities from the GLEEP reactor at AERE Harwell

Reference thermal and epithermal neutron flux densities have been determined at the GLEEP reactor at AERE Harwell for the slow neutron calibration of film dosimeters, criticality lockets and other detectors. The fluxes were calculated from absolute measurements at NPL made on gold foils exposed in a beam facility and outside the thermal column of the reactor. Details of the calculation are given together with an assessment of the uncertainties of the method. (Auth.)