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      https://www.ias.ac.in/article/fulltext/seca/070/01/0001-0017

    • Keywords

       

      Uranium; Radon; Activity Ratio; Uranium Concentration; Anion Exchange Resin

    • Abstract

       

      The concentrations of dissolved uranium and radium isotopes have been determined in the waters of several Indian rivers. The concentration of uranium (U-238) is found to vary between 0·01–7·0 micrograms/litre, depending primarily on the terrain through which the river flows. From the available data on the activity ratios, U-234/U-238, concentration of U-238 in rivers and the amount of uranium depositing on the ocean floor, a material balance calculation has been attempted. This shows that the supply of uranium to sea by rivers based on above measurements, is inadequate to explain the observed concentrations of U-238 and U-234 in the oceans.

      The Ra-226 concentration of river waters is found to be of the order of 0·1 dpm/litre (varying between 0·05–0·2 dpm/litre). The activity ratios, Ra-228/Ra-226, range between 1 and 4. This large variation is clearly related to the fact that the concentrations of the parent nuclides of Ra-226 and Ra-228 are different. The observed ratios are consistent with those expected from leaching of clays/soils; however, analogous to the situation in the case of uranium, the observed concentrations of radium isotopes in the oceans are too large to be explained by their influx by rivers.

    • Author Affiliations

       

      Suman G Bhat1 S Krishnaswamy1

      1. Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Bombay-5
    • Dates

       
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