Die Bestimmung von Korngrößen und von Diffusionskonstanten aus dem Emaniervermögen

Mechanisms and Modeling Approaches of Radon Emanation for Natural Materials

“…Solid diffusion Diffusion of radon in solid at room temperature has been thought to make no contribution to emanation ( Diffusion = 0) because of substantially low diffusion coef cients of radon (Table 3). 2,4,[11][12][13][14][15][16][17][18] The diffusion length, (m), is expressed as Rn and 9 × Fi g. 1 Scheme of radon emanation phenomenon. Radon atoms in points (A), (B), (E), (F), (G), and (H) are regarded as being emanated and in points (C), (D), and (I) as not emanated.…”

“…To our knowledge, a German paper written by FLÜGGE and ZIMENS 12) was the rst report about radon emanation modeling. Since then, this research theme had not been advanced for a while.…”

Diffusion of Fission Products at High Temperatures from Refractory Matrices

“…Although the actual process of diffusion from these materials is a complex one, it has been observed that the fraction remaining of each fission product studied at a given temperature and in a given geometry csm be approximately represented by am equation of the form -2-F. = c. e "(^^ +(1 -c.)e ^^2) 11 1…”

Health risk related to radon in a thermal spa utilizing waters from Guarani aquifer

“…It is subjected to recoil at "birth", with the emanated fraction relatively to that produced in the solid phase being dependent on factors such as total surface area of solids and concentration/distribution of 238 U ( 226 Ra) in the minerals [1]. On the other hand, 222 Rn also generates several daughters (heavy metals) through a sequence decay that finishes with lead, i.e.…”