Abstract
The problem of neutron energy measurement is considered in the energy ranges, thermal (< 0·5 eV), intermediate (0·5 eV-10 keV), fast (10 keV-15 MeV) and relativistic (> 15 MeV), together with the general problem of neutron flux measurement. Sensitivities and resolutions obtainable are given for a variety of methods. It is concluded that for thermal and intermediate energy measurements in radiological applications it is best to use BF3 counters, fission chambers, moderated detectors, together with gold or manganese foils, in conjunction with the Westcott flux convention; at higher energies methods based on proton recoil detectors are preferred for high sensitivity and accuracy, while threshold detectors are suggested if multichannel pulse-height analysers and computers are not available, or if there is a limitation on the size of the detectors.
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