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Radiation Protection Dosimetry 7:73-76 (1984)
© 1984 Oxford University Press

Emanating Power and Specific Surface Area

D.A.W. Bossus

The emanating power ? of radon may be regarded as having two components: a recoil emanating power ?R and a diffusion emanating power ?D, both being dependent on the specific surface area of the material in which radon is formed. In addition, recoil emanation depends on the range Rm of the recoiled radon atom, whereas diffusion emanation depends on the intercrystalline-diffusion coefficient. The diffusion coefficients are so low, notably in building materials, that at room temperature the emanation of radon should be attributed entirely to the recoil effect. Since the recoil effect has been found to be independent of the half-life of radon, the emanating powers of 220Rn and 222Rn must be of the same order of magnitude in a particular material. Apart from the parameters mentioned, the emanating power may also depend on other factors, such as the average pore diameter, the shape of the surface, and lattice defects. In brick samples, specific surface area and radon emanating power were measured. The results show a clear relation between the two. Also, the influence of the average pore diameter is demonstrated.


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