Abstract

• Radon is a colourless and odourless inert gas and its isotopes can be found in the uranium and thorium decay sequences occurring in the nature. An alpha particle is emitted during its decay. Its progeny elements are formed as a result of series of decays which are also radioactive. A study of radon concentration has been carried out in the five different tile samples, using LR-II5 type II Solid State Nuclear Track Detectors (SSNTDs). According to the present measurement, it was found that, the value of radon ranges from 219.05 ± 11.90 Bqm-3 to 441.90 ± 32.86 Bqm-3 with an average value 337.86 ± 23.24Bqm-3 . The annual effective dose ranges from 3.76 ± 0.20 mSvyr-1 to 7.6 ± 0.57 mSvyr-1 with an average value of 5.81 ± 0.40 mSvyr-1 .