Abstract
Annual Inhalation Dose of Indoor Radon and Thoron in Mizoram, India
Highlights
About 87% of the radiation dose received by mankind is due to natural radiation sources and the remaining 13% by anthropogenic radiation [1]
The most important component of natural radiation exposure to the public is due to the inhalation of indoor radon, thoron and their decay products which constitute about 54% of natural radiation [3]
As radon/thoron gases are inhaled, densely ionizing alpha particles emitted by the short-lived decay products of radon/thoron can interact with biological tissue in the lungs leading to DNA damage and results into lung cancer [4]
Summary
About 87% of the radiation dose received by mankind is due to natural radiation sources and the remaining 13% by anthropogenic radiation [1]. The worldwide average natural radiation dose to humans is about 0.3-1.0mSv/year which is four times higher than the world average of artificial radiation exposure [2]. The most important component of natural radiation exposure to the public is due to the inhalation of indoor radon, thoron and their decay products which constitute about 54% of natural radiation [3]. Since majority of the residents use to spend most of the time at indoors, the knowledge of the indoor concentration of radon, thoron and their progenies is of utmost importance. To calculate the annual indoor inhalation dose of radon and thoron, their indoor concentration, progenies concentration and their equilibrium factors must be calculated first. To measure the progenies concentration, deposition base Direct Radon/Thoron Progeny Sensor (DRPS/DTPS) were used [6,7,8]. The geographical location of the study area is Saiha and Lawngtlai districts of Mizoram, India within Latitude-220 29’ 28.3” to 220 36’ 59.4” and Longitude 920 59’ 14.3” to 920 52’ 22.0” with altitude ranging from 1866±10 feet to 3807±10 feet from the sea level
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