Abstract
AMALDI, D'Agostino, Fermi, Pontecorvo, Rasetti and Segrè have discovered that certain elements strongly absorb neutrons which have been slowed down by paraffin wax1. They report, for example, that thin sheets of cadmium or indium of 0.013 gm./cm.2 and 0.3 gm./cm.2 thickness respectively cut down the intensity of a beam of slow neutrons to half its value and find for iodine a half-value thickness of 4 gm./cm.2.
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References
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SZILAKD, L. Absorption of Residual Neutrons. Nature 136, 950–951 (1935). https://doi.org/10.1038/136950b0
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DOI: https://doi.org/10.1038/136950b0
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