Abstract
DENSITIES of slow neutrons in extended media may be measured by graphical1 or physical2 integration of the β-activity induced by neutron capture in a detecting element distributed in the medium. The combination of Szilard–Chalmers concentration with physical integration greatly increases the available intensity3. Manganese, as permanganate ion, is an eminently suitable detector4,5. The bulk of the induced activity is found in the manganese dioxide fraction, which is isolated by simple filtration. This activity is a measure of the average neutron density.
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ERBER, J., RIEDER, W. & BRODA, E. Determination of Neutron Densities by the Permanganate Method. Nature 165, 810 (1950). https://doi.org/10.1038/165810a0
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DOI: https://doi.org/10.1038/165810a0
