Abstract
A method for quantification of the 222 Rn flux from the ground surface into the atmosphere is described. A chamber made of polymethylmethacrylate (PMMA) was embedded in the soil and 222 Rn concentration and various affecting environmental factors were measured every hour. How environmental factors affect the 222 Rn concentration was considered and it was found that there were clear relationships between the variations of 222 Rn concentration and various environmental factors, especially air pressure. A simple lumped-parameter model approach was developed to obtain the undisturbed 222 Rn flux, which is the hypothetical situation without the chamber. The values of the parameter were found by fitting the model to the measured data for air pressure and 222 Rn concentration in the chamber. The effective diffusion coefficient obtained by the analysis agreed well with that obtained by the relation reported by Rogers and Nielson. The undisturbed 222 Rn flux from the ground surface into the atmosphere was estimated by using the parameter values obtained.
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