title: Theoretical evaluation of the 222Rn emanation coefficient for coal fly ash.
abstract: The release of 222Rn, from individual material grains in which it is formed, may be largely a diffusion process. This paper presents an analytical model purporting to describe the physical process of the release of 222Rn atoms from a 226Ra-bearing material grain. The solution of the diffusion equation for a spherical grain permits us to calculate theoretically the diffusion and emanation coefficient. Using this analysis to interpret experimental release data is explained.
mesh_terms: D002244:Carbon; D003031:Coal; D060729:Coal Ash; D004058:Diffusion; D008433:Mathematics; D008962:Models, Theoretical; D052638:Particulate Matter; D011851:Radioactivity; D011883:Radium; D011886:Radon
chemical_list: D003031:Coal; D060729:Coal Ash; D052638:Particulate Matter; D002244:Carbon; D011886:Radon; D011883:Radium