Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Soil-gas Thoron Concentration Associated with Seismic Activity

Hari Prasad Jaishi [a], Sanjay Singh [a], Raghavendra Prasad Tiwari [b] and Ramesh Chandra Tiwari*
* Author for corresponding; e-mail address: ramesh_mzu@rediffmail.com
Volume: Vol.42 No.4 (OCTOBER 2015)
Research Article
DOI:
Received: 11 March 2014, Revised: -, Accepted: 14 May 2014, Published: -

Citation: Jaishi H.P., Singh S., Tiwari R.P. and Tiwari R.C., Soil-gas Thoron Concentration Associated with Seismic Activity , Chiang Mai Journal of Science, 2015; 42(4): 972-979.

Abstract

 Radon is the by-product of the natural decay of radium that is derived from the decay series of uranium. Radon-220 (or thoron) is one of the three naturally occurring radio isotopes of radium. The half-life of thoron is 55 seconds. Continuous soil gas thoron monitoring was done using SSNTD (LR-115 type II film), manufactured by Kodak Pathe, France.  The study was carried out from March 2012 to February 2013 at Mat Bridge (23°18¢N, 92°48¢E) along Mat Fault in Serchhip District, Mizoram (India), which lies in seismic zone V of the seismic zonation map of India. The exposed SSNTDs were processed in a constant temperature bath. The average value of thoron concentration was recorded to be 203.08 tracks/cm2 with a standard deviation of 130.84 tracks/cm2. An attempt has been made to correlate thoron data to earthquakes that occurred during the observation period. The effect of meteorological parameters (viz. relative humidity, rainfall and air temperature) on thoron data was also taken into consideration. The study showed a positive correlation with  earthquake for one event. Positive correlation was found between thoron data and all the meteorological parameters.

Keywords: soil-gas thoron, LR-115 films, analysis, meteorological parameters, seismic activity

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