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In the situation of the air in the tunnel through the Earth, the pressure and density within the Earth quickly rises to extreme v alues as a function of depth, so that the air in the tunnel cannot W.d the tunnel in the air pdf Elizabeth Town conclusion that the variation of the radon concentration in the tunnel air is mainly caused by a convection current due to stack effect induced by the temperature difference between the tunnel air and the outside air [9]. In general, the ventilation in both of the tunnels not exists. So the radon concentration levels were higher than those recorded for a tunnel in Korea 95.1 Bq/ m3 [10], while
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