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Abstract. To validate nuclear data and code in the neutronics design of a hybrid reactor with thorium, integral experiments in two kinds of benchmark thorium assemblies with a D-T fusion neutron source have been performed. The one kind of 1D assemblies consists of polyethylene and depleted uranium shells. The other kind of 2D assemblies consists of three thorium oxide cylinders. The capture reaction rates, fission reaction rates, and (n, 2n) reaction rates in 232 Th in the assemblies are measured by ThO 2 foils. The leakage neutron spectra from the ThO 2 cylinders are measured by a liquid scintillation detector. The experimental uncertainties in all the results are analyzed. The measured results are compared to the calculated ones with MCNP code and ENDF/B-VII.0 library data.

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With the development of ITER and CFETR, the measurement of tritium in low-level tritiated water is indispensable from the viewpoint of assessment and safety of tritium. To reduce radioactive waste produced by liquid scintillation counting, we have built a new low-level tritiated water measurement system using CaF 2 (Eu) powders. When an 8 mm thickness sample chamber and M sample (average grain sizes: 59.1 µm) were used, our measurement system responded accurately to tritium concentrations down to approximately 2.6 Bq/mL for 10 min measurements, and the calculated detection limit was about 4.6 Bq/mL. When a 3 mm thickness sample chamber and S sample (average grain sizes: 8.4 µm) were used, our measurement system responded accurately to tritium concentrations down to approximately 1.2 Bq/mL for 10 min measurements, and the calculated detection limit was about 0.64 Bq/mL.

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