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Radiation Protection Dosimetry 7:95-100 (1984)
© 1984 Oxford University Press

Exhalation of 222Rn from Porous Materials

C. Samuelsson and H. Pettersson

The theory of time dependent radon diffusion transport has several implications on exhalation measurement techniques. It is shown that a one dimensional theory is applicable to samples in containers if the wall of the container is non absorbant. A reshaping of the internal radon concentration within the sample is responsible for the transfer from free to bound exhalation upon closing the container. The reshaping time is defined as the time taken to reach steady state exhalation. Examples are given where the reshaping times are so short that the steady state bound exhalation completely dominates the radon concentration growth in the outer volume. In such cases the mean exhalation rate during the first hours may be a gross underestimation of the free exhalation rate. As the steady state exhalation rate depends on the air leakage rate of the container, the leakage term must be known. It is stressed that the concept of 'back diffusion' is applicable only in the description of how the bound steady state exhalation diminishes with decreasing outer air volume in an enclosure.


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