Abstract
Accurate measurement of radon exhalation rate of building materials plays an important role in controlling indoor radon concentration. In order to achieve rapid and accurate measurement of radon exhalation, the influence of the volume, base area and pumping flow rate of radon collector on radon exhalation rate was studied to optimize the measurement parameters of radon exhalation rate and improve the measurement efficiency of radon exhalation rate. The study has shown that the larger the volume of radon collector is, the longer the radon concentration equilibrium time will be when radon exhalation rate is measured with constant pumping flow rate and surface precipitation rate, while the influence of the volume of radon collector on the equilibrium radon concentration can be neglected, but there is a specific linear relationship between the equilibrium radon concentration and the base area of radon collector. When the radon exhalation rate is measured with constant volume and base area of radon collector, the higher the pumping flow rate is, the shorter the radon concentration equilibrium time is and the smaller the equilibrium radon concentration is. When the radon exhalation rate is 3.9Bq∙m<sup>-2</sup>∙s<sup>-1</sup> in the experiment, the optimum volume of radon collector is 2.1×10<sup>-3</sup>m<sup>3</sup>, the optimum base area is 3.46×10<sup>-2</sup>m<sup>-2</sup>, and the optimum pumping flow rate is 1.349×10-5m3/s. The measurement parameters of the radon exhalation rate, such as the best volume and base area of radon collector and the pumping flow rate can be obtained for different radon exhalation rates through this optimization method.
Highlights
Radon exhalation rate is one of the most important factors determining the radon concentration in a certain environment, while radon and its daughters have always been the main contributors to the natural radiation dose for human
Under the condition of constant pumping flow rate, the radon concentration equilibrium time in radon collector increases linearly with the volume V of radon collector, and the equilibrium radon concentration in radon collector only presents proportional relationship with base area S of radon collector; when the volume and base area of radon collector are unchanged, the equilibrium radon concentration and radon concentration equilibrium time in radon collector are in inversely proportional relationship with the increase of pumping flow rate
Through theoretical calculation and experiment verification, the radon concentration equilibrium time in radon collector is inversely proportional to the increase of pumping rate
Summary
Radon exhalation rate is one of the most important factors determining the radon concentration in a certain environment, while radon and its daughters have always been the main contributors to the natural radiation dose for human. There are many studies at home and abroad on the measurement of radon exhalation rate on the surface of medium [9,10,11,12,13], there are few studies [14,15,16] on the influence of radon collector volume, base area and pumping flow rate on the radon exhalation rate on the surface of medium, while the determination of relevant parameters of radon collector is of great importance for the accurate measurement of radon exhalation rate. Through theoretical calculation and practical measurement, the optimization of equilibrium radon concentration and radon concentration equilibrium time in radon collector volume, base area, pumping flow rate and radon exhalation rate measurement were discussed
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