Relation between soil-gas radon variation and different lithotectonic units, Garhwal Himalaya, India

Measurements of radon concentration and uranium content in soil and rocks w ere made in the regions of the Alaknanda and Bhagirathi valleys in the Garh wal Himalaya by using radon emanometry and X-ray fluorescence method, respe ctively. The data were collected from different lithotectonic units along a nd across the various regional thrust planes, faults, shears, etc. The obse rved values were then correlated with the geological formations and structu re of the area. Radon concentrations were found to be controlled by litholo gy, structure and associated uranium mineralization. A positive linear corr elation was also observed between soil-gas radon and in situ uranium in the area. (C) 1999 Elsevier Science Ltd. All rights reserved.