gaseous diffusion process

gaseous diffusion process

[¦gash·əs di′fyü·zhən ‚präs·əs]
(nucleonics)
A method of separating isotopes in which an isotopic mixture of gases is allowed to diffuse through a porous wall; the lighter molecules pass through the porous wall more readily than the heavier molecules.
References in periodicals archive ?
The rate of imidization begins to decline rapidly at about 130 [degrees] C as molecular and gaseous diffusion processes become hindered by packing of the polymer molecules at or near their ultimate molecular weights.