[en] The main problem in fusion reactor technology is fast and complete tritium removal from the tritium breeder and the neutron multiplier - ceramic and Be pebbles. Under the operating conditions, these materials will be at a high temperature (up to 1120 K), under action of intense radiation (up to 10¹⁹ n/(m²·s) and magnetic field (MF up to 7-10 T). Up to now, tritium release of these materials was studied only under action of temperature and the neutron radiation of a fission reactor. It is difficult to introduce action of MF in experiments of this kind. A special rig for irradiation of samples at a high temperature up to 1120 K with fast electrons of 5 MeV and dose rate 14 MGy/h in MF up to 1.7 T was used for this study. The activity of the tritium released into a gas phase (molecular tritium T₂, HT, HTO) was measured with a gas flow detector. The activity of the tritium remained in the material (the forms of positively charged tritium T⁺, T₂, atomic tritium T^o and negatively charged tritium T^-) was determined by means of both a gas flow detector and a liquid scintillation method after dissolution of the material in acid with scavengers added. A delay of the tritium release in MF of 2.4 T at thermo annealing of the lithium orthosilicate Li₄SiO₄ pebbles (FZK) irradiated in the EXOTIC-8/8 experiment was observed. Chemical forms of the tritium localised in the pebbles and the tritium distribution were determined (up to 75% - in T⁺). The delaying effect of MF on the tritium release could be related to lengthening of the diffusion path of T⁺ in the volume of ceramic grains as a result of the Larmor effect. The beryllium pebbles irradiated in the BERYLLIUM experiment were annealed at 1120 K under the simultaneous action of the radiation and the MF of 1.7 T. The main form of the tritium localised in the Be pebbles is T₂ (85%-95%). A stimulating role of MF on the tritium release at the annealing under the radiation was observed (up to 80%). This effect may be related to radiolysis of the localised T₂ and the MF-induced spin transformation (singlet-triplet transformation) in the pair of radicals T^o · T^o, which increases the concentration of T^o, which is a better diffusing particle in the grain volume of Be metal. (author)