Abstract
This paper reports the measured results of radon concentrations at different positions of a house with CSR solid track detector with and without electret. The results show that the radon concentration is different positions of even the same room, it is the highest at end of a bed close to the wall, where his/her head usually is when the resident is on bed, being 1.6-1.8 times that at the position 0.5 m below the ceiling, and that at the middle of the room the radon concentration is decreasing with increasing height from the floor, the radon concentration at the height of 0.88 m is about 1.3-1.5 times that of 2.4 m (0.5 m below the ceiling).Based on the investigation, the radiation dose to the residents estimated in accordance with the average measured radon concentration at the location 0.5 m below the ceiling should be multiplied by a correction factor of about 1.5 to obtain the realistic dose.
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