Randon/Helium Survey of Thermal Springs of Parbati, Beas and Sutlej Valleys in Himachal Himalaya
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The purpose of this study is to measure radon and helium activity in the thermal springs of Himachal Himalaya. Radon is estimated in the soil and thermal waters using alpha spectrometry and scintil1ometry, respectively. The radon activity is maximum (716.3 Bq/L) in thermal spring (3) at Kasol and minimum (15.9 Bq/L) in a natural spring (bauli) at Takrer Radon concentration is highly variable in the Parbati valley with minimum value of 2230±430 Bq/m3 recorded at Chhinjra on the banks of river Parbati and a maximum value of 57700±2050 Bq/m3 at Dharmaur, the site of uranium ore exploitation by the AMD(DAE). Helium is estimated in the thennal springs by using a Helium Leak Detector (sniffing technique). The radon and helium contents of Kasol thermal springs are correJatable with high radioactivity in the soil of the area as revealed by Alpha Guard survey in the environs of Parbati valley. The helium content recorded in thermal springs is found to vary between 15-90 ppm.
Radon and Helium are well established as geochemical precursors for earthquake prediction studies. Helium/Radon ratio seems to be a better predictive tool for earthquakes in comparison to individual radon and helium precursors.
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