Photographic Methods of Measuring Slow Neutron Intensities

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Abstract
The relative slow neutron sensitivities of β-sensitive emulsions, x-ray film-indium foil combinations, and boron-loaded plates were investigated. Since the detection efficiency depends upon the neutron energy, experiments were made with epithermal, thermal, and cold neutrons. β-sensitive emulsions and x-ray-indium combinations are about equally useful for the detection of epithermal neutrons. B10 loaded plates, which are best for the detection of thermal and cold neutrons, have the following advantages: very low neutron intensities can be measured by microscopic counting of α-tracks, neutrons can be counted in the presence of β-and γ-radiation, the number of α-tracks is essentially independent of the development conditions, and a wide range of neutron intensities can be measured with a single plate.