Preliminary results on radiation damage in various graphites

Preliminary results of a broad irradiation program on graphite are reported. Within this program graph1tes of different degree of graphitization, given by the different graphitizability of the filler materials, have been studied. The irradiations were carried out with neutron doses up to 5 x 10$^{21}$ nvt at temperatures ranging from 70° to 700°0. The changes in physical properties such as lattice distance, macroscopic dimensions, density, thermal and electrical conductivity, magnetic susceptibility, coefficient of thermal expansion, mechanical strength and others are reported, with special emphasis on the mfiuence of the degree of graphitization