Radon free air system
There is 
60cm space
between the surface of the water and the top of the water tank. Radon gas contaminated in
the air in the gap could dissolve in the water. Radon free air is sent to this region. The
concentration of radon in the air is shown in Fig 1. It is of the order of 10 103 Bq/m
. It
changes seasonally because the flow of air in the mine changes.
|
|
Figure 1: |
The radon concentration in the air at various positions as a function of time. |
Fig 2 shows the radon free air system. This system consists of the following components.
 | Compressor: Air is compressed to 7.0 8.5
atm. |
| 0.3 air
filter |
| Buffer tank |
| Air drier: To remove moisture in the gas to improve the efficiency of removing radon. This system can remove  in
the gas as well. |
| Carbon column: To remove radon gas. |
| 0.1 and
0.01 air
filter |
As shown in Fig 1, the concentration of radon in the air through this system is
reduced to the order of 
in all seasons.
|
|
Figure 2: |
The radon free air system. |
