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Indoor and Built Environment
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Indoor Radon/Thoron Levels in Dwellings of the Hilly Regions Surrounding Guwahati, Assam

P. C. Deka

Department of Physics, Gauhati University, India, pdeka{at}rediffmail.com

Subir Sarkar

Department of Physics, Gauhati University, India

B. K. Sarma

Department of Physics, Gauhati University, India

T. D. Goswami

Department of Physics, Gauhati University, India

T. V. Ramachandran

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

K. S. V. Nambi

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

Solid State Nuclear Track Detectors (SSNTDs) are widely used for the determination of indoor radon and thoron levels. They are the most effective passive detectors available to obtain time integrated levels of radon, thoron and their daughters. This article gives the results of measurement and analysis of both radon and thoron in dwellings of different types in the hilly regions surrounding Guwahati, Assam made over a full year, covering all four seasons. The measurements were carried out using the passive time-integrated method by employing LR-115 (type II) detectors in plastic twin-chamber dosimeter cups. The estimated indoor radon levels varied from 101.1 to 238.5 Bq m 155.4 Bq m 3 with a mean of 3. The thoron levels were found to vary from 13.0 to 57.9 Bq m 1.

Key Words: Radon • Thoron • LR-115 detectors • India

Indoor and Built Environment, Vol. 12, No. 5, 343-349 (2003)
DOI: 10.1177/142032603035343
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