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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/092/03/0255-0260

    • Keywords

       

      Glaciers; bomb debris; ice accumulation

    • Abstract

       

      Vertical profiles of137Cs and210Pb have been determined in a 9 m column of ice from accumulation zone of Changme-Khangpu glacier in north Sikkim valley.137Cs activity varies from 4 to 22 dpm/ L. In many samples210Pb occurs at a level of 20 to 65 dpm/ L which is much higher than the expected fallout value.137Cs and210Pb activities correlate well with each other but not with the dust content. Possibility of210Pb production in the nuclear explosions is discussed. Several peaks appear in the depth profile of137Cs and210Pb which can be matched with Chinese atmospheric nuclear explosions with some phase difference if a uniform ice accumulation rate of 0.7 m per year is assumed since 1969.

    • Author Affiliations

       

      P N Shukla1 N Bhandari1 V N Nijampurkar1 D Kameswara Rao1 V M K Puri1 2 Sanjiv Sharma1 2

      1. Physical Research Laboratory, Ahmedabad - 380 009, India
      2. Geological Survey of India, Calcutta - 700 071, India
    • Dates

       
  • Journal of Earth System Science | News

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