• Dr. Manish Dogra
• Arun kumar
• Dr.R.S. Gill

Abstract Inhalation loss due to indoor radon and their short – lived progeny concentrations constitute a major part of the total natural background radiation received by the population. Exactness of this estimate needs to be ascertained from detailed measurement which was carried out in the Dharamshala area of Kangra district of Himachal Pradesh. Exposures to indoor radon and their daughter products are significantly influenced by various factors like topography, house construction, soil type, weather and even the life style of the people. The radon measurement was carried out using passive detector technique with LR115 type II as detector material. The indoor radon values in air were found to vary from 1194 Bq/m3 (Lower Sakoh) to 317 Bq/m3 (Depu Bazar) during winter season. In summer season the indoor radon values in air was found to vary from 719 Bq/m3 (Barol) to 163 Bq/m3 (Naddi) area of the Dharmshala with outrage values of both the seasons varying from 815 Bq/m3 (Barol) to 44.95 Bq/m3 (Chilgari) of Dharamshala area. In Sakoh area 78.94% houses surveys shows indoor radon value of 600-1500 Bq/m3 which is attributed due to closeness of the area to Drini thrust. The values are higher than the safe limit of 400 Bq/m3 as proposed by environmental protection agency posing a serious health hazards as radon decay products are radioactive and limited to aerosols present in the indoor air when inhaled pose a threat to lungs that may cause lung cancer.

KEYWORDS: Radon, Dharamshala, environment and health hazards.

"Study of Dhauladhar granitoids and its correlation with uranium and radon in the ecosystem for active tectonics and earthquake prediction studies", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.885-900, June 2019, Available :http://www.jetir.org/papers/JETIR1907431.pdf

"Study of Dhauladhar granitoids and its correlation with uranium and radon in the ecosystem for active tectonics and earthquake prediction studies", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp885-900, June 2019, Available at : http://www.jetir.org/papers/JETIR1907431.pdf