Indoor ~(220)Rn and its Progeny Levels in a Dwelling

摘要

In the traditional dwellings, source of ~(220)Rn is the bare soil floor, either soil in cave dwellings or unburned adobe bricks and uncovered stone, wall in above ground dwellings. Because of the short half life of ~(220)Rn, the indoor concentration is not homogeneous but increases towards the walls, floorings and ceilings. In view of this an extensive study is made by using the solid state nuclear track detector based dosimeters which were installed in parabolic fashion to see the variations of ~(220)Rn and its progeny levels as a function of distance in a room of volume 30 m~3. Higher concentrations were observed at the flooring, wall and ceiling of the room and it decreases as the detector is moved away from them. ~(220)Rn progeny concentrations did not show any variations with the distance from the wall.