Experimental Study Of Radon Exhalation Regulation Of Porous Emanation Medium With Liquid Water Under Different Pressure

The demand of crude uranium has been increased in China with the development of nuclear energy.Mostly shallow uranium mining has been exploited,so the development has been moved forward rapidly.However,radon protection has always been a complicated issue with the development of mining.In most scenarios,the cumulative radon exhalation is always the single factor,yet uranium mining needs to take many factors into account.The self-made two-dimension uranium soil test is made to study the impact mechanism with wind pressure and water content and the regulatory of complex radon exhalation to provide the scientific evidence of radon protection design.The regulation of radon exhalation is discussed under the wind pressure and water content factors based on the National Science Fund Project called ‘The study of the three difference coupling mechanism of deep uranium mine radon exhalation and radon airflow calculation mode’ and the simulation experience of designed lab.The main research is just as follows:（1）Design the exhalation test on porous emanation medium with water under the different pressure according to the similarity theory.And measured some basic parameters such as water content,indoor humidity,temperature,air pressur and so on.（2）Calculate the（cumulative）radon exhalation rate and analyze the impact between pressure difference and radon exhalation.The cumulative radon concentration of space grows linearly in certain time interval,while the difference value between the space and air pressure has negative connection with the cumulative radon exhalation rate on the surface of the uranium mine soil sample,and the positive pressure has inhibiting effect of radon emanation.（3）Analyze the impact between water content and radon exhalation based on the experimental results.The results have been shown that radon exhalation rate has positive connection with water content within low water content,yet the radon exhalation rate has negative connection with the water content when the maximum of water content is five percent approximately.（4）Obtained the mathematical model of radon exhalation rate regulatory within the pressure difference and water content through the data processing of MATLAB.The model is y=0.0045x₁²-3.176x₂²+0.213x₁+0.169x₂-0.0003x₁x₂+0.005.