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Variations in environmental tritium and moisture content with depth was measured at three sites in sandy-loam and sandy-clay-loam soils, sampled near Hyderabad in May 1974. The tritium input function for precipitation around Hyderabad for the years 1969 to 1973 was determined through measurements on available rain samples and through extrapolation of strontium-90 data for HASL network station at Rawalpindi.  Three peaks noticed in the tritium input function and probably caused by Chinese thermonuclear tests in 1970, 1971 and 1972, could be matched with those sequentially identified in the soil profiles. This identification has helped in dating the soil moisture and in calculation of average annual recharge to groundwater. The recharge was found to be 15·4 cm and 14·6 cm for sandy-loam and 11·1 cm for sandy-clay-loam soils.

Measurement of recharge rates in soils through detection of tritium produced in Chinese thermonuclear tests