Measurement of Neutron Spectra by Use of Nuclear Emulsions Loaded with Li6 Glass Specks

Abstract
Type E1 Ilford emulsions loaded with specks of Li6 glass were studied for the measurement of neutron spectra from ∼50 to 1000 kev. The method is independent of the neutron directions. Resolutions of about 200 kev were obtained. Calibrations were made by exposure to monoergic neutrons at several energies, and the method was tested by neutron spectra determined independently from fission and ``long counter'' data. The theory of the reduction of track data to neutron spectra is given. The results look promising for application to the measurement of neutron spectra in fast critical assemblies and for similar problems.

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