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Indoor and Built Environment, Vol. 8, No. 5, 322-326 (1999)
DOI: 10.1177/1420326X9900800507

Concentration of Radon and Thoron in Some Dwellings of the North-Eastern Region in India

R. Mishra

Department of Chemistry, North-Eastern Hill University, Shillong

S.P. Tripathy

Department of Chemistry, North-Eastern Hill University, Shillong

L. Pachuau

Department of Chemistry, North-Eastern Hill University, Shillong

C. Laldawngliana

Department of Chemistry, North-Eastern Hill University, Shillong

R. Lalramengzami

Department of Chemistry, North-Eastern Hill University, Shillong

S. Ghosh

Department of Chemistry, North-Eastern Hill University, Shillong

K.K. Dwivedi

Department of Chemistry, North-Eastern Hill University, Shillong

D.T. Khathing

Department of Physics, North-Eastern Hill University, Shillong

T.V. Ramachandran

Environmental Assessment Division, Bhabha Atomic Research Centre, Mumbai, India

It is well recognised all over the world that inhalation of indoor radon (222Rn), thoron (220Rn) and their progeny contribute a major fraction of the total radiation dose to human beings from natural sources. In the present work, an attempt has been made to assess the levels of radon and thoron in some dwellings of the seismic-prone North-Eastern region of India, using a special type of twin-chamber dosimeter. The results show a non-signifi cant increase in radon and thoron concentration during the winter season compared to summer of nearly 1.6 times and 1.3 times, respectively.

Key Words: Indoor radon and thoron • Twin-chamber dosimeter • Passive detection


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