Study of Indoor Radon and Thoron Levels in Srirampura, Bangalore, India using Passive Detector Technique

Results of the measurement of indoor radon and thoron carried out in and around Srirampura, Bangalore, India using passive detector technique is presented. Measurements were carried out using twin cup radon-thoron dosimeter using small strips of 12 micron thick LR-115 Type II nuclear track detectors. Measurements were carried out in 60 dwellings for a period of one year on a quarterly time integrated quarterly cycle to see the seasonal variation. After the exposure period, the detectors were chemically analyzed using 2.5 N NaOH at 60 C for a time of 90 minutes and the etched detectors were scanned by spark counter techniques. The estimated Rn and Rn levels in the studied locations showed the higher concentrations during winter season, in bath rooms, in concrete walls and in granite flooring houses. In this paper the author have made an attempt for the measurement of concentrations of indoor radon along with its distribution pattern based on construction material.