The Migration of Radon in Different Air Pressure Experimental Study and the Average Velocity Estimation

The previous radon migration experimental research object is for the most of radon gas in underground migration or the migration of air interface. By using the method of active carbon accumulated measuring radon, this thesis adjusts air pressure to study the migration regularity of radon. The paper measures the concentration distributions of radon in airtight vertical glass tube under the same temperature, humidity, different cumulative times and different pressure in vacuum (respectively for -0.06 MPa, -0.05 MPa, -0.04 MPa, atmospheric conditions).Basing on the migration equations of radon gas in the air and the concentration distribution of radon under different gas pressure, the paper estimates the average speed of radon gas under different pressures. Through series experiments, following conclusions can be obtained: the migration velocity of radon in the air is related with the air pressure: with greater air pressure, the conveyance speed is faster. Especially at low-pressure state the downward migration is more apparent. The average speed of radon in different pressures cases are estimated that compliance of the calculation results and the actual measurement was good results.