Radiation-induced variation of carbositall crystal lattice parameters

Studied is radiation change of the sample crystalline structure of industrial mark of CSB-15 carbositall containing boron and prepared at 1500 deg C, as well as carbositall samples Cs-18 without boron synthesized at 1800 deg C. The samples, treated at different temperatures, were irradiated at approximately 300 deg C with 3.7x1020 neutron/cm2 (neutron energy >0.18 MeV). To evaluate the degree of radiation damage of the crystalline structure the irradiated samples were then subjected to thermal annealing up to the temperature, at which the sample had been preliminarily thermal treated. The changes of interplane distance, lattice parameter in the basal plane, as well as width of diffraction lines (002) and carbostialls CSB-15 and CS-18, taking place during irradiation, do not disappear during annealing right up to thermal treatment temperature, preceding irradiation. The irradiated carbositall samples, containing boron, are worse graphitized, than non-irradiated ones