Abstract
The neutron emission rates of the UK national standard Ra-Be photoneutron source and a 252Cf spontaneous fission source have been remeasured by the manganese sulphate bath technique. The measurements were performed as part of a dilution experiment in which the hydrogen-to-manganese capture-cross-section ratio was determined following replacement of the original manganese sulphate by purer material. The data have been subjected to rigorous analysis in which the correlations were treated by covariance matrices. These measurements confirm the re-evaluation of previously determined source emission rates published in 1982. A value for the hydrogen-to-manganese capture-cross-section ratio of 0.02477 ± 0.00005 (one standard deviation) is recommended for use with other manganese baths and other neutron source spectra.
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