Levels of natural radioactivity in environment in residential area of Moradabad District, Western Uttar Pradesh

Document Type : Original Research Paper


Department of Physics, School of Sciences, IFTM University, Moradabad, UP, India


Indoor radon and thoron have been measured in the houses of
Moradabad District, Uttar Pradesh India, by means of solid state nuclear track
detectors. Radon, an invisible radioactive gas, occurs naturally in indoor
atmospheres and along with thoron is the most important contribution of human
exposure to natural sources. Radon exists in soil gas building materials and indoor
atmosphere to name but a few. Risk of lung cancer depends on the concentration
of radon and thoron and their decay products in the environment above
recommended levels. The present article measures the concentration of indoor
radon and thoron in 60 dosimeters by means of a solid state nuclear track detector
in different house types of Moradabad district, Uttar Pradesh. The measurements
have been carried out in residential buildings at a height of 2 m from the sea level,
using a twin chamber radon dosimeter. The value of radon concentration in the
present study varies between 10.5 Bq/m3 and 29.5 Bq/m3 with an average of 19.8
Bq/m3 while that of thoron is between 5.6 Bq/m3 and 24 Bq/m3 with an average of
14.9 Bq/m3 respectively. Results, obtained with twin cup radon/thoron dosimeter,
show that the concentration of indoor radon and thoron have been within the
recommended level, with all the values staying under the safe limits, decreed by
the International Commission on Radiological Protection (ICRP) and United
Nations Scientific Committee on the Effect of Atomic Radiation (UNSCEAR).


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