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Annual fallout of32Si,210Pb,22Na,35S and7Be in rains in India

  • D Lal
  • V N Nijampurkar
  • G Rajagopalan
  • B L K Somayajulu
Article

Abstract

The concentration of radioisotopes7Be,35S were measured in Bombay since 1956 and22Na,210Pb,32Si since 1963. In Khandala and other stations such measurements have been made at irregular periods since 1961. In addition several measurements especially that of32Si were made in 1970. Data available todate from Indian stations is summarised and critically analysed.

We conclude that appreciable amounts of35S,22Na and32Si, over and above their production by cosmic rays, were produced during the high yield Russian tests as evidenced by their fallout between 1962–66. Based on the bomb produced excess the half period for their removal from the stratosphere is deduced to be less than 1 year. The ‘excess’ contribution of32Si due to bombs is, however, small; about 1% of its inventory in the oceans.

The present study shows that for stations where orogeny is the principal mechanism of precipitation, the annual fallout is independent of the annual rainfall.

Keywords

Cosmic rays radioisotopes rainwater fallout 

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References

  1. Bhandari N 1965 Ph.D. Thesis (Bombay University), p. 154Google Scholar
  2. Bhandari N, Lal D and Rama 1970J. Geophys. Res. 73 2974CrossRefGoogle Scholar
  3. Bhandari N and Rama 1963aJ. Geophys. Res. 68 1959CrossRefGoogle Scholar
  4. Bhandari N and Rama 1963bJ. Geophys. Res. 68 3823CrossRefGoogle Scholar
  5. Clausen H B 1973J. Glaciol. 12 411Google Scholar
  6. Dansgaard W, Clausen H B and Aarkrog A 1966J. Geophys. Res. 71 5474Google Scholar
  7. Fukuda K and Tsunogai S 1975Tellus 27 514Google Scholar
  8. Goel P S 1956Nature (London) 178 1458CrossRefGoogle Scholar
  9. Goel P S, Narasappaya N, Prabhakara C, Thor Rama and Zutshi P K 1959Tellus 11 91Google Scholar
  10. Gopalakrishnan S, Rangarajan C, Joshi L U, Kapoor D K and Eapen C D 1973 Bhabha Atomic Research Centre Report 679 pp. 124Google Scholar
  11. Health and Safety Laboratory 1971 Fallout Program Quarterly Summary Report HASL-245Google Scholar
  12. Jantsch K 1967Kernenergie 10 Heft3 89Google Scholar
  13. Jaworowski Z and Kownacka L 1976Nature (London) 263 303CrossRefGoogle Scholar
  14. Joshi L U, Rangarajan C and Gopalakrishnan S 1969Tellus 21 107Google Scholar
  15. Kharkar D P, Lal D and Somayajulu B L K 1963 inRadioactive Dating (Vienna: IAEA) p. 175Google Scholar
  16. Kharkar D P, Nijampurkar V N and Lal D 1966Geochim. Cosmochim. Acta 30 621CrossRefGoogle Scholar
  17. Krebs A and Stewart N G 1963 inNuclear radiation in geophysics, eds. H Isreal and A Krebs p 241Google Scholar
  18. Lal D, Nijampurkar V N and Somayajulu B L K 1970aGalathea Report (Danish Science Press)11 247Google Scholar
  19. Lal D, Nijampurkar V N and Rama 1970b inIsotope hydrology (Vienna: IAEA) p 847Google Scholar
  20. Lal D and Peters B 1967Handbuch der Physik 46 551Google Scholar
  21. Lal D and Rama 1966J. Geophys. Res. 71 2865Google Scholar
  22. Lal D and Suess H E 1968Ann. Rev. Nucl. Sci. 18 407CrossRefGoogle Scholar
  23. Lambert G, Ardouin B, Nezami M and Polian G 1966Tellus 18 421CrossRefGoogle Scholar
  24. Nijampurkar V N 1974 Ph.D. Thesis (Bombay University) p. 165Google Scholar
  25. Poet S E, Moore H E and Martell E A 1972J. Geophys. Res. 77 6515CrossRefGoogle Scholar
  26. Rangarajan C, Gopalakrishnan S, Chandrasekharan V R and Eapen C D 1975J. Geophys. Res. 80 845CrossRefGoogle Scholar
  27. Somayajulu B L K, Lal D and Craig H 1973Earth Planet Sci. Lett. 18 181CrossRefGoogle Scholar
  28. Somayajulu B L K and Zutshi P K 1961X Cosmic Ray Symp. Madras Google Scholar
  29. Turekian K K, Nozaki Y and Benninger L K 1977Ann. Rev. Earth Planet. Sci. 5 227CrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 1979

Authors and Affiliations

  • D Lal
    • 1
  • V N Nijampurkar
    • 1
  • G Rajagopalan
    • 2
  • B L K Somayajulu
    • 1
  1. 1.Physical Research LaboratoryAbmedabad
  2. 2.Birbal Sahni Institute of PalaeobotanyLucknow

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