Abstract
The growing particles-gas reaction is very important in the molecular laser isotope separation of uranium-235 (235U) at RIKEN, because an isotope exchange reaction between growing 235U enriched UF5 particles and natural UF6 is thought to be one of the most serious problems which causes the separation factor to deterionate. We present here a new simple calculation method to estimate the influence of this reaction system. Using an exchange reaction probability of 1.1 ×10-9 reported by G. Y. Grigore'v et al, , we found that the influence of the isotope exchange reaction between growing 235U enriched UF5 particles and natural UF6 gas was negligible to the separation factor.