In World War II, Dr. Turkevich worked for the Manhattan Project, which built the atomic bomb, studying gaseous diffusion and measurements of radioactive fallout.
Recently, the diffusion coefficient of silver (Ag) in zirconium carbide (ZrC) at 1500 °C was determined to help elucidate the diffusive behavior of radioactive 110mAg in the ZrC coating of the tri-structural isotropic (TRISO) nuclear fuel particle.
By using literature data on the in-diffusion of traces of radioactive cesium in an argillaceous rock (Opalinus clay) and a compacted bentonite (FEBEX bentonite), we have demonstrated that taking into account the mass-transfer limitations considerably improves the quality of the theoretical fit of the time evolution of radio-tracer concentration in the reservoir.
He then further realized that such an approach could be applied to problems such as the production and diffusion of neutrons in radioactive material, a problem in which at each step there were so many possibilities that a solution was impossible to calculate.
Interface diffusion of 210Pb and 113Sn radioactive tracers in oriented Pb 62wtt% Sn eutectic specimens showing lamellar structure has been measured.
Since Kushmerick and Podolsky (21) cut the fiber in the transverse section and looked only in the longitudinal distribution of radioactive labeling, the diffusion coefficients in the transverse directions were left undetermined in that work.
Both methods were based on the theory related to diffusion of instantaneously applied, infinitely thin radioactive sources in semi-infinite one-dimensional diffusion media.
These appear to correspond to the time scale of (1) the reduction in the original FDNPP accident surge (primary emission source), (2) the tropospheric transportation and diffusion of the radioactive plume (equivalent to the removal of radioactive aerosols from the atmosphere), and (3) the emission intensity of re-suspension (secondary emission sources).
The design of radioactive ion production systems by the Isotope-Separator-On-Line method requires knowledge of diffusion features of atoms out of solids.
The production of radioactive ion beams by the isotope mass separation online (ISOL) method requires a fast diffusion and effusion of nuclear products from thick refractory target materials under high-energy particle beam irradiation.
