[en] The gaseous diffusion of neutron activated krypton and xenon were investigated in silicate and sodium chloride media at multiple pressures. Measurements of radionuclide transport were conducted by introducing each gas into the bottom of a 316 stainless steel two- bulb gaseous diffusion apparatus. The porous media bridge between each bulb was filled with either Ottawa density sand or granular sodium chloride sieved to obtain matching particle size distributions. The transport of each radionuclide was monitored by a collimated lanthanum bromide detector at each bulb over the course of several days until equilibrium distribution was achieved. Relative diffusion rates and relaxation times for each nuclide in different media and pressures are discussed and compared to results obtained in prior two-bulb diffusion studies. (author)