『Abstract
　Radon and its progeny have been recognized as one of the major contributors to the natural radiation and health hazards in the human dwellings. Even lung cancer is expected if it is present in enhanced levels beyond maximum permissible limit. This paper reports the measurements of indoor radon and its progeny in the urban dwellings of the Etah district of Uttar Pradesh province in Northern India using the cellulose nitrate (LR-115 type-II) plastic track detectors. It is found that the values of radon concentration vary from 3.52 to 248.64 Bq m^-3 with a standard deviation of 69.19. The values of radon progeny concentration vary from 0.38 to 26.88 mWL with a standard deviation of 7.48. The effective dose has been calculated and found to vary from 0.05 to 3.76 Sv year^-1 with a standard deviation of 1.05. The lifetime fatality risk is found to vary from 0.04×10^-1 to 2.90×10^-4. The results have been compared with the results reported in the rural areas of the same district.

Keywords: Radon and its progeny levels; LR-115 type II plastic track detectors; Effective dose; Life time fatality risk』

Introduction
Experimental methods
　Geology of the area
　Indoor radon measurements
Results and discussion
Conclusions
Acknowledgments
References