Gas release kinetics from neutron irradiated Li2TiO3 samples


Askerbekov S. Aitkulov M. Shaimerdenov A. Kulsartov T. Akhanov A. Bugybay Z. Sairanbayev D.
July 2025Elsevier Ltd

Fusion Engineering and Design
2025#216

This study investigates the kinetics of residual tritium release from neutron-irradiated samples of Li-6 enriched lithium metatitanate (Li2TiO3) using the thermal desorption spectroscopy (TDS) method. The samples were subjected to low-temperature neutron irradiation in the peripheral channel of the WWR-K reactor (Almaty, Kazakhstan) for 21 days. The accumulated thermal neutron fluence was 3.0 × 10–19 см-2. During the experiments, the samples were linearly heated from room temperature to 1173 K at different heating rates. The released gaseous products were recorded using an RGA-100 mass spectrometer under deep vacuum conditions. The experimental results revealed two distinct peaks of tritium release, corresponding to different retention mechanisms: • The first peak (630–707 K) has a low activation energy (56 kJ/mol) and a small pre-exponential factor (7 c-1), indicating desorption of tritium from the surface and from the open porosity. • The second peak (713–794 K) is characterized by a higher activation energy (74 kJ/mol) and an increased pre-exponential factor (31 c-1), indicating the release of tritium from the closed porosity and near-surface layers.It was established that tritium is predominantly released in the form of HT. Thus, the obtained data enable both qualitative and quantitative characterization of the kinetic parameters of tritium release from Li2TiO, which can be useful for the selection and optimization of breeder materials for fusion reactors.

Gas release , Lithium metatitanate , Neutron Irradiation , Thermal desorption spectroscopy , Tritium , WWR-K

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Institute of Nuclear Physics, Almaty, Kazakhstan
IETP al-Farabi Kazakh National University, Almaty, Kazakhstan

Institute of Nuclear Physics
IETP al-Farabi Kazakh National University

10 лет помогаем публиковать статьи Международный издатель

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