Abstract
A hollow cylinder of manganese is used as a detector of thermal neutrons which are generated by the moderation in a surrounding water tank of fast neutrons from a source placed within the detector. The activation of the detector is investigated as a function of the position within it of a very small neutron source and found to be insensitive to this position. The detector then provides an accurate and sensitive means for the comparison of neutron sources of very different sizes, such as a large radium plus beryllium mixed source and a small radium-beryllium-fluoride neutron standard source.
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