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On-stream measurement of heavy water concentration by intermediate neutron moderation
Authors:N. Wada
Affiliation:(1) Department of Radioisotopes, Japan Atomic Energy Research Institute, "Omacr"arai-machi, Ibaraki-ken, (Japan)
Abstract:A method of measuring heavy water concentration is described based on intermediate neutron moderation. With a 1.6 mgrg252Cf neutron source and a BF3 proportional counter, for 500 ml samples, accuracies of the measurements are within ±0.02 mol% in the concentration range of 0sim100 mol% with 2sim10 minute counting. To evaluate the practical effectiveness of the method, a model apparatus was built for routine use in laboratory and on-stream measurements. It was successfully applied to observe the substitution process between light water and heavy water in an ion exchange resin tower at a nuclear power station.
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