Effective Diffusion Coefficient of Radon in Concrete, Theory and Method for Field Measurements

User's manual for RESRAD-BUILD version 3.

“…The minimum and maximum values were those reported by Frankowski et al (1997) and Culot et al (1976), respectively. The probability density function is shown in Figure J.19.…”

“…Overall porosity of concrete depends on the porosity of the cement paste as well as of the aggregates. The porosity of concrete was found to range from 0.05 to 0.25 (Culot et al 1976). …”

“…Cement paste in concrete occupies from 23 to 36% of the total volume (Culot et al 1976), sand 25 to 30%, and aggregates the remainder. Overall porosity of concrete depends on the porosity of the cement paste as well as of the aggregates.…”

Environmental risk assessment of radon from ceramic tiles

“…The emanation power is dimensionless and ranges from 0 (no radon escapes from the material) to 1 (all radon escapes). The rate of radon exhalation is proportional to the gradient of the radon concentration in the internal pores (Culot et al, 1976). The principal factors affecting the radon exhalation rate from building material per unit activity concentration of radium-226 are the porosity and the density of the material, the diffusion coefficient, the water, the age, and the composition of the material, as seen in equation (3) (3) where ε is the emanation power, C Ra is the effective radium concentration, ρ is the density, D is the effective diffusion coefficient, λ is the decay constant of radon-222, P is the porosity of the material, and l is the half thickness of the material.…”

Composite Analysis for the Area 5 Radioactive Waste Management Site at the Nevada Test Site, Nye County, Nevada

“…The effective diffusion coefficient is defined after Culot et al (1976) as the diffusion coefficient corrected for the effects of increased path length in the porous medium. Consistent with the above definition, the effective gas diffusion coefficient is calculated as (Jury et al, 1991): The equation of continuity is solved assuming steady-state conditions and two boundary conditions.…”